diff --git a/docs/models/supported_models.md b/docs/models/supported_models.md
index 0f3b730eabedc..3847fc15119fd 100644
--- a/docs/models/supported_models.md
+++ b/docs/models/supported_models.md
@@ -593,6 +593,7 @@ Specified using `--task generate`.
 | `GraniteSpeechForConditionalGeneration` | Granite Speech | T + A | `ibm-granite/granite-speech-3.3-8b` | ✅︎ | ✅︎ | ✅︎ |
 | `H2OVLChatModel` | H2OVL | T + I<sup>E+</sup> | `h2oai/h2ovl-mississippi-800m`, `h2oai/h2ovl-mississippi-2b`, etc. | | ✅︎ | ✅︎ |
 | `Idefics3ForConditionalGeneration` | Idefics3 | T + I | `HuggingFaceM4/Idefics3-8B-Llama3`, etc. | ✅︎ | | ✅︎ |
+| `InternS1ForConditionalGeneration` | Intern-S1 | T + I<sup>E+</sup> | `internlm/Intern-S1`, etc. | | ✅︎ | ✅︎ |
 | `InternVLChatModel` | InternVL 3.0, InternVideo 2.5, InternVL 2.5, Mono-InternVL, InternVL 2.0 | T + I<sup>E+</sup> + (V<sup>E+</sup>) | `OpenGVLab/InternVL3-9B`, `OpenGVLab/InternVideo2_5_Chat_8B`, `OpenGVLab/InternVL2_5-4B`, `OpenGVLab/Mono-InternVL-2B`, `OpenGVLab/InternVL2-4B`, etc. | ✅︎ | ✅︎ | ✅︎ |
 | `KeyeForConditionalGeneration` | Keye-VL-8B-Preview | T + I<sup>E+</sup> + V<sup>E+</sup> | `Kwai-Keye/Keye-VL-8B-Preview` | | | ✅︎ |
 | `KimiVLForConditionalGeneration` | Kimi-VL-A3B-Instruct, Kimi-VL-A3B-Thinking | T + I<sup>+</sup> | `moonshotai/Kimi-VL-A3B-Instruct`, `moonshotai/Kimi-VL-A3B-Thinking` | | | ✅︎ |
diff --git a/examples/offline_inference/vision_language.py b/examples/offline_inference/vision_language.py
index eb6b410848558..61f5525c6d7e7 100644
--- a/examples/offline_inference/vision_language.py
+++ b/examples/offline_inference/vision_language.py
@@ -468,6 +468,37 @@ def run_tarsier(questions: list[str], modality: str) -> ModelRequestData:
     )
 
 
+# Intern-S1
+def run_interns1(questions: list[str], modality: str) -> ModelRequestData:
+    assert modality == "image"
+
+    model_name = "internlm/Intern-S1"
+
+    engine_args = EngineArgs(
+        model=model_name,
+        trust_remote_code=True,
+        max_model_len=8192,
+        max_num_seqs=2,
+        limit_mm_per_prompt={modality: 1},
+        enforce_eager=True,
+    )
+
+    placeholder = "<IMG_CONTEXT>"
+    tokenizer = AutoTokenizer.from_pretrained(model_name, trust_remote_code=True)
+    messages = [
+        [{"role": "user", "content": f"{placeholder}\n{question}"}]
+        for question in questions
+    ]
+    prompts = tokenizer.apply_chat_template(
+        messages, tokenize=False, add_generation_prompt=True
+    )
+
+    return ModelRequestData(
+        engine_args=engine_args,
+        prompts=prompts,
+    )
+
+
 # InternVL
 def run_internvl(questions: list[str], modality: str) -> ModelRequestData:
     model_name = "OpenGVLab/InternVL3-2B"
@@ -1303,6 +1334,7 @@ model_example_map = {
     "h2ovl_chat": run_h2ovl,
     "hyperclovax_seed_vision": run_hyperclovax_seed_vision,
     "idefics3": run_idefics3,
+    "interns1": run_interns1,
     "internvl_chat": run_internvl,
     "nemotron_vl": run_nemotron_vl,
     "keye_vl": run_keye_vl,
diff --git a/examples/offline_inference/vision_language_multi_image.py b/examples/offline_inference/vision_language_multi_image.py
index 2e14fc807e104..e312a0953e9be 100644
--- a/examples/offline_inference/vision_language_multi_image.py
+++ b/examples/offline_inference/vision_language_multi_image.py
@@ -253,6 +253,33 @@ def load_smolvlm(question: str, image_urls: list[str]) -> ModelRequestData:
     )
 
 
+def load_interns1(question: str, image_urls: list[str]) -> ModelRequestData:
+    model_name = "internlm/Intern-S1"
+
+    engine_args = EngineArgs(
+        model=model_name,
+        trust_remote_code=True,
+        max_model_len=4096,
+        limit_mm_per_prompt={"image": len(image_urls)},
+    )
+
+    placeholders = "\n".join(
+        f"Image-{i}: <IMG_CONTEXT>\n" for i, _ in enumerate(image_urls, start=1)
+    )
+    messages = [{"role": "user", "content": f"{placeholders}\n{question}"}]
+
+    tokenizer = AutoTokenizer.from_pretrained(model_name, trust_remote_code=True)
+    prompt = tokenizer.apply_chat_template(
+        messages, tokenize=False, add_generation_prompt=True
+    )
+
+    return ModelRequestData(
+        engine_args=engine_args,
+        prompt=prompt,
+        image_data=[fetch_image(url) for url in image_urls],
+    )
+
+
 def load_internvl(question: str, image_urls: list[str]) -> ModelRequestData:
     model_name = "OpenGVLab/InternVL2-2B"
 
@@ -946,6 +973,7 @@ model_example_map = {
     "gemma3": load_gemma3,
     "h2ovl_chat": load_h2ovl,
     "idefics3": load_idefics3,
+    "interns1": load_interns1,
     "internvl_chat": load_internvl,
     "hyperclovax_seed_vision": load_hyperclovax_seed_vision,
     "keye_vl": load_keye_vl,
diff --git a/tests/models/registry.py b/tests/models/registry.py
index b41e432d738a7..0dc5aec8db12e 100644
--- a/tests/models/registry.py
+++ b/tests/models/registry.py
@@ -381,6 +381,8 @@ _MULTIMODAL_EXAMPLE_MODELS = {
                                          extras={"2B": "OpenGVLab/InternVL2-2B",
                                                  "3.0": "OpenGVLab/InternVL3-1B"},  # noqa: E501
                                          trust_remote_code=True),
+    "InternS1ForConditionalGeneration": _HfExamplesInfo("internlm/Intern-S1",
+                                         trust_remote_code=True),
     "Idefics3ForConditionalGeneration": _HfExamplesInfo("HuggingFaceM4/Idefics3-8B-Llama3",  # noqa: E501
                                                         {"tiny": "HuggingFaceTB/SmolVLM-256M-Instruct"}),  # noqa: E501
     "KeyeForConditionalGeneration": _HfExamplesInfo("Kwai-Keye/Keye-VL-8B-Preview", # noqa: E501
diff --git a/vllm/model_executor/models/interns1.py b/vllm/model_executor/models/interns1.py
new file mode 100644
index 0000000000000..36204e4c5953f
--- /dev/null
+++ b/vllm/model_executor/models/interns1.py
@@ -0,0 +1,711 @@
+# SPDX-License-Identifier: Apache-2.0
+# SPDX-FileCopyrightText: Copyright contributors to the vLLM project
+
+# --------------------------------------------------------
+# InternS1
+# Copyright (c) 2025 Shanghai AI Lab
+# Licensed under The MIT License [see LICENSE for details]
+# --------------------------------------------------------
+from collections.abc import Iterable, Mapping, Sequence
+from typing import Literal, Optional, TypedDict, Union
+
+import torch
+import torch.nn as nn
+from transformers import InternVLProcessor, PretrainedConfig
+from transformers.activations import ACT2FN
+from transformers.models.got_ocr2.image_processing_got_ocr2_fast import (
+    GotOcr2ImageProcessorFast)
+
+from vllm.config import VllmConfig
+from vllm.model_executor.layers.quantization import QuantizationConfig
+from vllm.model_executor.models.interns1_vit import InternS1VisionModel
+from vllm.model_executor.models.module_mapping import MultiModelKeys
+from vllm.model_executor.sampling_metadata import SamplingMetadata
+from vllm.multimodal import MULTIMODAL_REGISTRY
+from vllm.multimodal.inputs import (MultiModalDataDict, MultiModalFieldConfig,
+                                    MultiModalKwargs, NestedTensors)
+from vllm.multimodal.parse import (ImageEmbeddingItems, ImageProcessorItems,
+                                   ImageSize, MultiModalDataItems)
+from vllm.multimodal.processing import (BaseMultiModalProcessor,
+                                        BaseProcessingInfo, PromptReplacement,
+                                        PromptUpdate, PromptUpdateDetails)
+from vllm.multimodal.profiling import BaseDummyInputsBuilder
+from vllm.sequence import IntermediateTensors
+
+from .interfaces import (MultiModalEmbeddings, SupportsLoRA,
+                         SupportsMultiModal, SupportsPP)
+from .utils import (AutoWeightsLoader, WeightsMapper, flatten_bn,
+                    init_vllm_registered_model, maybe_prefix,
+                    merge_multimodal_embeddings)
+
+
+class InternS1MultiModalProjector(nn.Module):
+
+    def __init__(self, config):
+        super().__init__()
+        self.layer_norm = nn.LayerNorm(config.vision_config.hidden_size *
+                                       int(1 / config.downsample_ratio)**2)
+        self.linear_1 = nn.Linear(
+            config.vision_config.hidden_size *
+            int(1 / config.downsample_ratio)**2,
+            config.text_config.hidden_size)
+        self.act = ACT2FN[config.projector_hidden_act]
+        self.linear_2 = nn.Linear(config.text_config.hidden_size,
+                                  config.text_config.hidden_size)
+
+    def forward(self, image_features):
+        hidden_states = self.layer_norm(image_features)
+        hidden_states = self.linear_1(hidden_states)
+        hidden_states = self.act(hidden_states)
+        hidden_states = self.linear_2(hidden_states)
+        return hidden_states
+
+
+class InternS1ImagePixelInputs(TypedDict):
+    type: Literal["pixel_values"]
+    pixel_values: torch.Tensor
+    """
+    Shape:
+    `(batch_size * num_images * (1 + num_patches), num_channels, height, width)`
+    """
+
+
+class InternS1ImageEmbeddingInputs(TypedDict):
+    type: Literal["image_embeds"]
+    data: Union[torch.Tensor, list[torch.Tensor]]
+    """
+    A tensor of shape `(num_images, total_image_feature_size, hidden_size)`
+    or a list of tensors of shape `(total_image_feature_size, hidden_size)`
+
+    `hidden_size` must match the hidden size of language model backbone.
+    """
+
+
+InternS1ImageInputs = Union[InternS1ImagePixelInputs,
+                            InternS1ImageEmbeddingInputs]
+
+
+class InternS1VideoPixelInputs(TypedDict):
+    type: Literal["pixel_values_videos"]
+    pixel_values: torch.Tensor
+    """
+    Shape:
+    `(batch_size * num_video * num_frames, num_channels, height, width)`
+    """
+
+    num_patches: torch.Tensor
+    """Shape: `(batch_size * num_images)`"""
+
+
+class InternS1VideoEmbeddingInputs(TypedDict):
+    type: Literal["video_embeds"]
+    data: Union[torch.Tensor, list[torch.Tensor]]
+    """
+    A tensor of shape `(num_videos, total_video_feature_size, hidden_size)`
+    or a list of tensors of shape `(total_video_feature_size, hidden_size)`
+
+    `hidden_size` must match the hidden size of language model backbone.
+    """
+
+
+InternS1VideoInputs = Union[InternS1VideoPixelInputs,
+                            InternS1VideoEmbeddingInputs]
+
+
+def resolve_interns1_min_max_num(
+    min_dynamic_patch: int,
+    max_dynamic_patch: int,
+    dynamic_image_size: bool,
+    use_thumbnail: bool,
+) -> tuple[int, int]:
+    min_dynamic_patch = min_dynamic_patch if dynamic_image_size else 1
+    max_dynamic_patch = max_dynamic_patch if dynamic_image_size else 1
+
+    if use_thumbnail and max_dynamic_patch != 1:
+        max_dynamic_patch += 1
+
+    return min_dynamic_patch, max_dynamic_patch
+
+
+def get_interns1_target_ratios(
+    min_num: int,
+    max_num: int,
+) -> list[tuple[int, int]]:
+    target_ratios = {(i, j)
+                     for n in range(min_num, max_num + 1)
+                     for i in range(1, n + 1)
+                     for j in range(1, n + 1) if min_num <= i * j <= max_num}
+    return sorted(target_ratios, key=lambda x: x[0] * x[1])
+
+
+class InternS1ProcessingInfo(BaseProcessingInfo):
+    """Basic image-only ProcessingInfo for InternS1-style models."""
+
+    def get_hf_processor(self, **kwargs: object) -> InternVLProcessor:
+        return self.ctx.get_hf_processor(InternVLProcessor, **kwargs)
+
+    def get_supported_mm_limits(self) -> Mapping[str, Optional[int]]:
+        return {"image": None}
+
+    def get_num_image_tokens(
+        self,
+        *,
+        image_width: int,
+        image_height: int,
+        processor: Optional['GotOcr2ImageProcessorFast'] = None,
+    ) -> int:
+        if processor is None:
+            processor = self.get_hf_processor().image_processor
+
+        if not isinstance(processor, GotOcr2ImageProcessorFast):
+            raise ValueError(f'GotOcr2ImageProcessorFast is expected but got '
+                             f'{type(processor)}')
+        num_image_patches = processor.get_number_of_image_tokens(
+            image_height, image_width, images_kwargs=dict())
+        num_image_tokens = self.get_hf_processor(
+        ).image_seq_length * num_image_patches
+        return num_image_tokens
+
+    def resolve_target_ratios(self, use_thumbnail: Optional[bool] = None):
+        image_processor = self.get_hf_processor().image_processor
+        min_dynamic_patch = image_processor.min_patches
+        max_dynamic_patch = image_processor.max_patches
+        # HF format's InternVL processor uses `crop_to_patches` which is
+        # equivalent to `use_thumbnail` in original format.
+        use_thumbnail = image_processor.crop_to_patches
+        dynamic_image_size = True
+        min_num, max_num = resolve_interns1_min_max_num(
+            min_dynamic_patch,
+            max_dynamic_patch,
+            dynamic_image_size,
+            use_thumbnail=use_thumbnail)
+
+        return get_interns1_target_ratios(min_num, max_num)
+
+    def get_image_size_with_most_features(self) -> ImageSize:
+        processor = self.get_hf_processor()
+
+        hf_config = self.ctx.get_hf_config()
+        base_height, base_width = hf_config.vision_config.image_size
+        target_ratios = self.resolve_target_ratios()
+
+        largest_feature_size, largest_feature_pinpoint = 0, None
+        for wr, hr in target_ratios:
+            width, height = base_width * wr, base_height * hr
+
+            feat_size = self.get_num_image_tokens(
+                image_width=width,
+                image_height=height,
+                processor=processor.image_processor,
+            )
+            if feat_size > largest_feature_size:
+                largest_feature_size = feat_size
+                largest_feature_pinpoint = ImageSize(width=width,
+                                                     height=height)
+
+        assert not (largest_feature_size == 0 or largest_feature_pinpoint
+                    is None), ("Cannot have a largest feature size of 0!")
+
+        return largest_feature_pinpoint
+
+    def get_max_image_tokens(self) -> int:
+        processor = self.get_hf_processor()
+        target_width, target_height = self.get_image_size_with_most_features()
+
+        return self.get_num_image_tokens(
+            image_width=target_width,
+            image_height=target_height,
+            processor=processor.image_processor,
+        )
+
+
+class InternS1DummyInputsBuilder(BaseDummyInputsBuilder[InternS1ProcessingInfo]
+                                 ):
+    """Basic image-only DummyInputsBuilder for InternS1-style models."""
+
+    def get_dummy_text(self, mm_counts: Mapping[str, int]) -> str:
+        num_images = mm_counts.get("image", 0)
+        image_token = self.info.get_hf_processor().image_token
+
+        return image_token * num_images
+
+    def get_dummy_mm_data(
+        self,
+        seq_len: int,
+        mm_counts: Mapping[str, int],
+    ) -> MultiModalDataDict:
+        target_width, target_height = \
+            self.info.get_image_size_with_most_features()
+        num_images = mm_counts.get("image", 0)
+
+        return {
+            "image":
+            self._get_dummy_images(width=target_width,
+                                   height=target_height,
+                                   num_images=num_images)
+        }
+
+
+class InternS1MultiModalProcessor(
+        BaseMultiModalProcessor[InternS1ProcessingInfo]):
+    """ Basic image-only MultiModalProcessor for InternS1-style models."""
+
+    def _call_hf_processor(
+        self,
+        prompt: str,
+        mm_data: Mapping[str, object],
+        mm_kwargs: Mapping[str, object],
+        tok_kwargs: Mapping[str, object],
+    ) -> Mapping[str, NestedTensors]:
+        processed_outputs = super()._call_hf_processor(
+            prompt=prompt,
+            mm_data=mm_data,
+            mm_kwargs=mm_kwargs,
+            tok_kwargs=tok_kwargs,
+        )
+
+        hf_processor = self.info.get_hf_processor(**mm_kwargs)
+        image_token_id = hf_processor.image_token_id
+
+        # Since there may be extra tokens in the feature placeholders,
+        # we need to pass the image token ID to the model to select the
+        # tokens to merge from the vision encoder outputs
+        processed_outputs["image_token_id"] = torch.tensor(image_token_id)
+        images = mm_data.get('images', None)
+        image_processor = self.info.get_hf_processor().image_processor
+        if images is not None:
+            image_inputs = image_processor(images=images)
+            image_num_patches = image_inputs.pop("num_patches")
+            if not isinstance(image_num_patches, list):
+                raise ValueError(
+                    f'num_patches is supposed to be list, but got '
+                    f'{type(image_num_patches)}')
+            image_num_patches = torch.tensor(image_num_patches)
+            processed_outputs['image_num_patches'] = image_num_patches
+
+        return processed_outputs
+
+    def _get_mm_fields_config(
+        self,
+        hf_inputs: Mapping[str, NestedTensors],
+        hf_processor_mm_kwargs: Mapping[str, object],
+    ) -> Mapping[str, MultiModalFieldConfig]:
+
+        image_num_patches = hf_inputs.get("image_num_patches", torch.empty(0))
+        num_images = len(image_num_patches)
+
+        return dict(
+            pixel_values=MultiModalFieldConfig.flat_from_sizes(
+                "image", image_num_patches),
+            image_num_patches=MultiModalFieldConfig.batched("image"),
+            image_embeds=MultiModalFieldConfig.batched("image"),
+            image_token_id=MultiModalFieldConfig.shared("image", num_images),
+        )
+
+    def _get_prompt_updates(
+        self,
+        mm_items: MultiModalDataItems,
+        hf_processor_mm_kwargs: Mapping[str, object],
+        out_mm_kwargs: MultiModalKwargs,
+    ) -> Sequence[PromptUpdate]:
+        hf_processor = self.info.get_hf_processor(**hf_processor_mm_kwargs)
+        img_context_token = hf_processor.image_token
+        start_image_token = hf_processor.start_image_token
+        end_image_token = hf_processor.end_image_token
+
+        def get_replacement(item_idx: int):
+            images = mm_items.get_items(
+                "image", (ImageEmbeddingItems, ImageProcessorItems))
+
+            if isinstance(images, ImageEmbeddingItems):
+                feature_size = images.get_feature_size(item_idx)
+            else:
+                image_size = images.get_image_size(item_idx)
+                feature_size = self.info.get_num_image_tokens(
+                    image_width=image_size.width,
+                    image_height=image_size.height,
+                    processor=hf_processor.image_processor,
+                )
+
+            repl_features = img_context_token * feature_size
+            repl_full = start_image_token + repl_features + end_image_token
+            return PromptUpdateDetails.select_text(repl_full,
+                                                   img_context_token)
+
+        return [
+            PromptReplacement(
+                modality="image",
+                target=img_context_token,
+                replacement=get_replacement,
+            )
+        ]
+
+
+@MULTIMODAL_REGISTRY.register_processor(
+    InternS1MultiModalProcessor,
+    info=InternS1ProcessingInfo,
+    dummy_inputs=InternS1DummyInputsBuilder)
+class InternS1ForConditionalGeneration(nn.Module, SupportsMultiModal,
+                                       SupportsPP, SupportsLoRA):
+
+    # To ensure correct weight loading and mapping.
+    hf_to_vllm_mapper = WeightsMapper(
+        orig_to_new_prefix={
+            "lm_head.": "language_model.lm_head.",
+            "model.language_model.": "language_model.model.",
+            "model.vision_tower.": "vision_tower.",
+            "model.multi_modal_projector.": "multi_modal_projector.",
+        })
+
+    @classmethod
+    def get_placeholder_str(cls, modality: str, i: int) -> Optional[str]:
+        # transformers InternVLProcessor uses <IMG_CONTEXT> as the seperator
+        # refer to https://github.com/huggingface/transformers/blob/f90de364c2484c7c325bbe05befdcf487bd75b63/src/transformers/models/internvl/processing_internvl.py#L116
+        if modality.startswith("image"):
+            return '<IMG_CONTEXT>'
+        if modality.startswith("video"):
+            return "<video>"
+
+        raise ValueError("Only image or video modality is supported")
+
+    def __init__(self, *, vllm_config: VllmConfig, prefix: str = "") -> None:
+        super().__init__()
+        config = vllm_config.model_config.hf_config
+        quant_config = vllm_config.quant_config
+        multimodal_config = vllm_config.model_config.multimodal_config
+
+        self.config = config
+        self.multimodal_config = multimodal_config
+
+        image_size = config.vision_config.image_size[0]
+        patch_size = config.vision_config.patch_size[0]
+        self.patch_size = patch_size
+        self.num_image_token = int(
+            (image_size // patch_size)**2 * (config.downsample_ratio**2))
+        self.downsample_ratio = config.downsample_ratio
+
+        self.llm_arch_name = config.text_config.architectures[0]
+        self.vision_tower = self._init_vision_model(
+            config,
+            quant_config=quant_config,
+            prefix=maybe_prefix(prefix, "vision_tower"),
+        )
+
+        self.language_model = init_vllm_registered_model(
+            vllm_config=vllm_config,
+            hf_config=config.text_config,
+            prefix=maybe_prefix(prefix, "language_model"),
+        )
+
+        self.multi_modal_projector = self._init_mlp1(config)
+
+        self.img_context_token_id = None
+        self.video_context_token_id = None
+
+        self.visual_token_mask = None
+        self.make_empty_intermediate_tensors = (
+            self.language_model.make_empty_intermediate_tensors)
+
+    def _init_vision_model(
+        self,
+        config: PretrainedConfig,
+        quant_config: Optional[QuantizationConfig],
+        *,
+        prefix: str,
+    ):
+        num_hidden_layers = config.vision_config.num_hidden_layers
+        return InternS1VisionModel(
+            config.vision_config,
+            quant_config=quant_config,
+            num_hidden_layers_override=num_hidden_layers,
+            prefix=prefix,
+        )
+
+    def _init_mlp1(self, config: PretrainedConfig) -> nn.Sequential:
+        return InternS1MultiModalProjector(config)
+
+    def pixel_shuffle(self, x, scale_factor=0.5):
+        n, w, h, c = x.size()
+        # N, W, H, C --> N, W, H * scale, C // scale
+        x = x.view(n, w, int(h * scale_factor), int(c / scale_factor))
+        # N, W, H * scale, C // scale --> N, H * scale, W, C // scale
+        x = x.permute(0, 2, 1, 3).contiguous()
+        x = x.view(n, int(h * scale_factor), int(w * scale_factor),
+                   int(c / (scale_factor * scale_factor)))
+        x = x.permute(0, 2, 1, 3).contiguous()
+        return x
+
+    def extract_feature(self, pixel_values: torch.Tensor) -> torch.Tensor:
+        vit_embeds = self.vision_tower(pixel_values=pixel_values)
+        vit_embeds = vit_embeds[:, 1:, :]
+
+        h = w = int(vit_embeds.shape[1]**0.5)
+        vit_embeds = vit_embeds.reshape(vit_embeds.shape[0], h, w, -1)
+        vit_embeds = self.pixel_shuffle(vit_embeds,
+                                        scale_factor=self.downsample_ratio)
+        vit_embeds = vit_embeds.reshape(vit_embeds.shape[0], -1,
+                                        vit_embeds.shape[-1])
+
+        vit_embeds = self.multi_modal_projector(vit_embeds)
+        return vit_embeds
+
+    def _validate_pixel_values(self, data: torch.Tensor) -> torch.Tensor:
+
+        h, w = self.config.vision_config.image_size
+        expected_dims = (3, h, w)
+
+        def _validate_shape(d: torch.Tensor):
+            actual_dims = tuple(d.shape)
+
+            if actual_dims != expected_dims:
+                expected_expr = str(expected_dims)
+                raise ValueError(
+                    "The expected shape of pixel values per image per batch "
+                    f" per patch is {expected_expr}. "
+                    f"You supplied {tuple(d.shape)}.")
+
+        for d in data:
+            _validate_shape(d)
+
+        return data
+
+    def _parse_and_validate_image_input(
+            self, **kwargs: object) -> Optional[InternS1ImageInputs]:
+        pixel_values = kwargs.pop("pixel_values", None)
+        image_num_patches = kwargs.pop("image_num_patches", None)
+        image_embeds = kwargs.pop("image_embeds", None)
+
+        if pixel_values is None and image_embeds is None:
+            return None
+
+        if image_embeds is not None:
+            if not isinstance(image_embeds, (torch.Tensor, list)):
+                raise ValueError("Incorrect type of image embeddings. "
+                                 f"Got type: {type(image_embeds)}")
+
+            return InternS1ImageEmbeddingInputs(
+                type="image_embeds",
+                data=flatten_bn(image_embeds),
+            )
+
+        image_token_id = kwargs["image_token_id"]
+        assert isinstance(image_token_id, torch.Tensor)
+        self.img_context_token_id = image_token_id.flatten().unique().item()
+
+        if pixel_values is not None:
+            if not isinstance(pixel_values, (torch.Tensor, list)):
+                raise ValueError("Incorrect type of pixel values. "
+                                 f"Got type: {type(pixel_values)}")
+
+            if not isinstance(image_num_patches, (torch.Tensor, list)):
+                raise ValueError("Incorrect type of image_num_patches. "
+                                 f"Got type: {type(image_num_patches)}")
+
+            pixel_values = flatten_bn(pixel_values, concat=True)
+            image_num_patches = flatten_bn(image_num_patches, concat=True)
+
+            return InternS1ImagePixelInputs(
+                type="pixel_values",
+                pixel_values=self._validate_pixel_values(pixel_values),
+                num_patches=image_num_patches,
+            )
+
+        raise AssertionError("This line should be unreachable.")
+
+    def _parse_and_validate_video_input(
+            self, **kwargs: object) -> Optional[InternS1VideoPixelInputs]:
+        pixel_values_flat_video = kwargs.pop("pixel_values_flat_video", None)
+        video_num_patches = kwargs.pop("video_num_patches", None)
+        video_embeds = kwargs.pop("video_embeds", None)
+
+        if pixel_values_flat_video is None and video_embeds is None:
+            return None
+
+        if video_embeds is not None:
+            if not isinstance(video_embeds, (torch.Tensor, list)):
+                raise ValueError("Incorrect type of video embeddings. "
+                                 f"Got type: {type(video_embeds)}")
+
+            return InternS1ImageEmbeddingInputs(
+                type="video_embeds",
+                data=flatten_bn(video_embeds),
+            )
+
+        video_token_id = kwargs["video_token_id"]
+        assert isinstance(video_token_id, torch.Tensor)
+        self.video_context_token_id = video_token_id.flatten().unique().item()
+
+        if pixel_values_flat_video is not None:
+            if not isinstance(pixel_values_flat_video, (torch.Tensor, list)):
+                raise ValueError("Incorrect type of pixel values. "
+                                 f"Got type: {type(pixel_values_flat_video)}")
+
+            if not isinstance(video_num_patches, (torch.Tensor, list)):
+                raise ValueError("Incorrect type of image_num_patches. "
+                                 f"Got type: {type(video_num_patches)}")
+
+            pixel_values_flat_video = flatten_bn(pixel_values_flat_video,
+                                                 concat=True)
+            video_num_patches = flatten_bn(video_num_patches, concat=True)
+
+            return InternS1VideoPixelInputs(
+                type="pixel_values_videos",
+                pixel_values=self._validate_pixel_values(
+                    pixel_values_flat_video),
+                num_patches=video_num_patches,
+            )
+
+        raise AssertionError("This line should be unreachable.")
+
+    def _process_image_input(
+        self,
+        image_input: Union[InternS1ImageInputs, InternS1VideoPixelInputs],
+    ) -> tuple[torch.Tensor, ...]:
+        if image_input["type"] == "image_embeds":
+            return image_input["data"]
+
+        assert self.vision_tower is not None
+
+        image_embeds = self.extract_feature(image_input["pixel_values"])
+
+        num_patches = image_input["num_patches"]
+
+        # Only one image in the current batch
+        if len(num_patches) == 1:
+            return (image_embeds.view(-1,
+                                      self.config.text_config.hidden_size), )
+
+        # NOTE: Image embeddings are split into separate tensors for each image
+        # by the size of each embedding.
+        feature_size = image_embeds.shape[1]
+        image_embeds = image_embeds.view(-1,
+                                         self.config.text_config.hidden_size)
+        image_feature_sizes = [
+            num_patches * feature_size for num_patches in num_patches
+        ]
+        return image_embeds.split(image_feature_sizes)
+
+    def _parse_and_validate_multimodal_inputs(self, **kwargs: object) -> dict:
+        modalities = {}
+
+        # Preserve the order of modalities if there are multiple of them
+        # from the order of kwargs.
+        for input_key in kwargs:
+            if input_key in ("pixel_values",
+                             "image_embeds") and "images" not in modalities:
+                modalities["images"] = self._parse_and_validate_image_input(
+                    **kwargs)
+            if input_key in ("pixel_values_flat_video",
+                             ) and "videos" not in modalities:
+                modalities["videos"] = self._parse_and_validate_video_input(
+                    **kwargs)
+
+        return modalities
+
+    def _set_visual_token_mask(self, input_ids: torch.Tensor) -> None:
+        self.visual_token_mask = None
+
+    def get_language_model(self) -> torch.nn.Module:
+        return self.language_model
+
+    def get_multimodal_embeddings(self,
+                                  **kwargs: object) -> MultiModalEmbeddings:
+
+        modalities = self._parse_and_validate_multimodal_inputs(**kwargs)
+        if not modalities:
+            return []
+            return None
+
+        # The result multimodal_embeddings is tuple of tensors, with each
+        # tensor correspoending to a multimodal data item (image or video).
+        multimodal_embeddings: tuple[torch.Tensor, ...] = ()
+
+        # NOTE: It is important to iterate over the keys in this dictionary
+        # to preserve the order of the modalities.
+        for modality in modalities:
+            if modality == "images":
+                image_input = modalities["images"]
+                vision_embeddings = self._process_image_input(image_input)
+                multimodal_embeddings += vision_embeddings
+            if modality == "videos":
+                video_input = modalities["videos"]
+                video_embeddings = self._process_image_input(video_input)
+                multimodal_embeddings += video_embeddings
+
+        return multimodal_embeddings
+
+    def get_input_embeddings(
+        self,
+        input_ids: torch.Tensor,
+        multimodal_embeddings: Optional[MultiModalEmbeddings] = None,
+    ) -> torch.Tensor:
+        inputs_embeds = self.language_model.get_input_embeddings(input_ids)
+        if multimodal_embeddings is not None \
+            and len(multimodal_embeddings) != 0:
+            context_token_ids = [
+                token_id for token_id in (self.img_context_token_id,
+                                          self.video_context_token_id)
+                if token_id is not None
+            ]
+            assert len(context_token_ids) >= 1
+            self._set_visual_token_mask(input_ids)
+            inputs_embeds = merge_multimodal_embeddings(
+                input_ids,
+                inputs_embeds,
+                multimodal_embeddings,
+                context_token_ids,
+            )
+        return inputs_embeds
+
+    def forward(
+        self,
+        input_ids: torch.Tensor,
+        positions: torch.Tensor,
+        intermediate_tensors: Optional[IntermediateTensors] = None,
+        inputs_embeds: Optional[torch.Tensor] = None,
+        **kwargs: object,
+    ) -> IntermediateTensors:
+
+        if intermediate_tensors is not None:
+            input_ids = None
+            inputs_embeds = None
+
+        # NOTE: In v1, inputs_embeds is always generated at model runner, this
+        # condition is for v0 compatibility.
+        elif inputs_embeds is None:
+            vision_embeddings = self.get_multimodal_embeddings(**kwargs)
+            inputs_embeds = self.get_input_embeddings(input_ids,
+                                                      vision_embeddings)
+            input_ids = None
+
+        forward_kwargs = {
+            "input_ids": input_ids,
+            "positions": positions,
+            "intermediate_tensors": intermediate_tensors,
+            "inputs_embeds": inputs_embeds,
+        }
+
+        hidden_states = self.language_model.model(**forward_kwargs)
+        return hidden_states
+
+    def compute_logits(
+        self,
+        hidden_states: torch.Tensor,
+        sampling_metadata: SamplingMetadata,
+    ) -> Optional[torch.Tensor]:
+        return self.language_model.compute_logits(hidden_states,
+                                                  sampling_metadata)
+
+    def load_weights(self, weights: Iterable[tuple[str,
+                                                   torch.Tensor]]) -> set[str]:
+        loader = AutoWeightsLoader(self)
+        return loader.load_weights(weights, mapper=self.hf_to_vllm_mapper)
+
+    def get_mm_mapping(self) -> MultiModelKeys:
+        """
+        Get the module prefix in multimodal models
+        """
+        return MultiModelKeys.from_string_field(
+            language_model="language_model",
+            connector="multi_modal_projector",
+            tower_model="vision_tower")
diff --git a/vllm/model_executor/models/interns1_vit.py b/vllm/model_executor/models/interns1_vit.py
new file mode 100644
index 0000000000000..300ed17ecaabc
--- /dev/null
+++ b/vllm/model_executor/models/interns1_vit.py
@@ -0,0 +1,421 @@
+# SPDX-License-Identifier: Apache-2.0
+# SPDX-FileCopyrightText: Copyright contributors to the vLLM project
+
+# adapted from https://huggingface.co/OpenGVLab/InternVL2-4B/blob/main/modeling_intern_vit.py
+# --------------------------------------------------------
+# InternVL
+# Copyright (c) 2023 OpenGVLab
+# Licensed under The MIT License [see LICENSE for details]
+# --------------------------------------------------------
+from collections.abc import Iterable
+from typing import Optional
+
+import torch
+import torch.nn as nn
+import torch.nn.functional as F
+from transformers import PretrainedConfig
+from transformers.utils import torch_int
+
+from vllm.model_executor.layers.activation import get_act_fn
+from vllm.model_executor.layers.layernorm import RMSNorm
+from vllm.model_executor.layers.linear import (ColumnParallelLinear,
+                                               RowParallelLinear)
+from vllm.model_executor.layers.quantization import QuantizationConfig
+from vllm.model_executor.model_loader.weight_utils import default_weight_loader
+
+NORM2FN = {
+    'rms_norm': RMSNorm,
+    'layer_norm': nn.LayerNorm,
+}
+
+
+class InternS1VisionPatchEmbeddings(nn.Module):
+
+    def __init__(self, config):
+        super().__init__()
+        image_size, patch_size = config.image_size, config.patch_size
+        num_channels, hidden_size = config.num_channels, config.hidden_size
+
+        num_patches = (image_size[1] // patch_size[1]) * (image_size[0] //
+                                                          patch_size[0])
+        patch_shape = (image_size[0] // patch_size[0],
+                       image_size[1] // patch_size[1])
+        self.image_size = image_size
+        self.patch_size = patch_size
+        self.num_channels = num_channels
+        self.num_patches = num_patches
+        self.patch_shape = patch_shape
+
+        self.projection = nn.Conv2d(num_channels,
+                                    hidden_size,
+                                    kernel_size=patch_size,
+                                    stride=patch_size)
+
+    def forward(self, pixel_values: torch.Tensor) -> torch.Tensor:
+        batch_size, num_channels, height, width = pixel_values.shape
+        if num_channels != self.num_channels:
+            raise ValueError(
+                "Make sure that the channel dimension of the pixel values "
+                "match with the one set in the configuration.")
+
+        embeddings = self.projection(
+            pixel_values.to(self.projection.weight.dtype))
+        patch_height, patch_width = embeddings.shape[2], embeddings.shape[3]
+        embeddings = embeddings.flatten(2).transpose(1, 2)
+
+        return embeddings, (patch_height, patch_width)
+
+
+class InternS1VisionEmbeddings(nn.Module):
+
+    def __init__(self, config: PretrainedConfig):
+        super().__init__()
+        self.config = config
+        self.cls_token = nn.Parameter(torch.zeros(1, 1, config.hidden_size))
+        if config.use_mask_token:
+            self.mask_token = nn.Parameter(
+                torch.zeros(1, 1, config.hidden_size))
+        else:
+            self.mask_token = None
+        self.patch_embeddings = InternS1VisionPatchEmbeddings(config)
+        self.patch_size = config.patch_size
+        self.image_size = (config.image_size if isinstance(
+            config.image_size, Iterable) else
+                           (config.image_size, config.image_size))
+        num_patches = self.patch_embeddings.num_patches
+        if config.use_absolute_position_embeddings:
+            self.position_embeddings = nn.Parameter(
+                torch.zeros(1, num_patches + 1, config.hidden_size))
+        else:
+            self.position_embeddings = None
+
+    def interpolate_pos_encoding(self, embeddings: torch.Tensor, height: int,
+                                 width: int) -> torch.Tensor:
+        """
+        This method allows to interpolate the pre-trained position encodings, to be able to use the model on higher resolution
+        images. This method is also adapted to support torch.jit tracing.
+
+        Adapted from:
+        - https://github.com/facebookresearch/dino/blob/de9ee3df6cf39fac952ab558447af1fa1365362a/vision_transformer.py#L174-L194, and
+        - https://github.com/facebookresearch/dinov2/blob/e1277af2ba9496fbadf7aec6eba56e8d882d1e35/dinov2/models/vision_transformer.py#L179-L211
+        """  # noqa: E501
+
+        num_patches = embeddings.shape[1] - 1
+        num_positions = self.position_embeddings.shape[1] - 1
+
+        # always interpolate when tracing to ensure the exported model
+        # works for dynamic input shapes
+        if not torch.jit.is_tracing(
+        ) and num_patches == num_positions and height == width:
+            return self.position_embeddings
+
+        class_pos_embed = self.position_embeddings[:, :1]
+        patch_pos_embed = self.position_embeddings[:, 1:]
+
+        dim = embeddings.shape[-1]
+
+        new_height = height // self.patch_size[0]
+        new_width = width // self.patch_size[1]
+
+        sqrt_num_positions = torch_int(num_positions**0.5)
+        patch_pos_embed = patch_pos_embed.reshape(1, sqrt_num_positions,
+                                                  sqrt_num_positions, dim)
+        patch_pos_embed = patch_pos_embed.permute(0, 3, 1, 2)
+
+        patch_pos_embed = nn.functional.interpolate(
+            patch_pos_embed,
+            size=(new_height, new_width),
+            mode="bicubic",
+            align_corners=False,
+        )
+
+        patch_pos_embed = patch_pos_embed.permute(0, 2, 3, 1).view(1, -1, dim)
+
+        return torch.cat((class_pos_embed, patch_pos_embed), dim=1)
+
+    def forward(
+        self,
+        pixel_values: torch.Tensor,
+        bool_masked_pos: Optional[torch.BoolTensor] = None,
+    ) -> torch.Tensor:
+        _, _, height, width = pixel_values.shape
+        embeddings, (patch_height,
+                     patch_width) = self.patch_embeddings(pixel_values)
+        batch_size, seq_len, _ = embeddings.size()
+
+        if bool_masked_pos is not None:
+            mask_tokens = self.mask_token.expand(batch_size, seq_len, -1)
+            # replace the masked visual tokens by mask_tokens
+            w = bool_masked_pos.unsqueeze(-1).type_as(mask_tokens)
+            embeddings = embeddings * (1 - w) + mask_tokens * w
+
+        cls_tokens = self.cls_token.expand(batch_size, -1, -1)
+        embeddings = torch.cat((cls_tokens, embeddings), dim=1)
+
+        if self.position_embeddings is not None:
+            embeddings = embeddings + self.interpolate_pos_encoding(
+                embeddings, height, width)
+
+        return embeddings, (patch_height, patch_width)
+
+
+class InternSdpaAttention(nn.Module):
+    """Multi-headed attention from 'Attention Is All You Need' paper"""
+
+    def __init__(
+        self,
+        config: PretrainedConfig,
+        *,
+        num_dummy_heads: int = 0,
+    ) -> None:
+        super().__init__()
+
+        self.config = config
+        self.embed_dim = config.hidden_size
+        self.num_heads = config.num_attention_heads
+        self.head_dim = self.embed_dim // self.num_heads
+        if self.head_dim * self.num_heads != self.embed_dim:
+            raise ValueError(
+                f'embed_dim must be divisible by num_heads '
+                f'(got `embed_dim`: {self.embed_dim} and `num_heads`:'
+                f' {self.num_heads}).')
+
+        # Additional dummy heads are used to enable TP for common GPU counts.
+        self.dummy_dim = (num_dummy_heads + self.num_heads) * self.head_dim
+
+        self.scale = self.head_dim**-0.5
+
+        self.q_proj = nn.Linear(self.embed_dim,
+                                self.num_heads * self.head_dim,
+                                bias=config.attention_bias)
+        self.k_proj = nn.Linear(self.embed_dim,
+                                self.num_heads * self.head_dim,
+                                bias=config.attention_bias)
+        self.v_proj = nn.Linear(self.embed_dim,
+                                self.num_heads * self.head_dim,
+                                bias=config.attention_bias)
+
+        self.qk_normalization = config.use_qk_norm
+        if self.qk_normalization:
+            self.q_norm = RMSNorm(self.dummy_dim,
+                                  eps=config.layer_norm_eps,
+                                  var_hidden_size=self.embed_dim)
+            self.k_norm = RMSNorm(self.dummy_dim,
+                                  eps=config.layer_norm_eps,
+                                  var_hidden_size=self.embed_dim)
+
+        self.projection_layer = nn.Linear(self.dummy_dim, self.embed_dim)
+
+    def forward(self, x: torch.Tensor) -> torch.Tensor:
+        B, N, C = x.shape
+
+        q = self.q_proj(x)
+        k = self.k_proj(x)
+        v = self.v_proj(x)
+
+        q = q.view(B, N, self.num_heads, self.head_dim)
+        k = k.view(B, N, self.num_heads, self.head_dim)
+        v = v.view(B, N, self.num_heads, self.head_dim)
+
+        if self.qk_normalization:
+            B_, N_, H_, D_ = q.shape
+            q = self.q_norm(q.flatten(-2, -1)).view(B_, N_, H_, D_)
+            k = self.k_norm(k.flatten(-2, -1)).view(B_, N_, H_, D_)
+        q = q.transpose(1, 2)
+        k = k.transpose(1, 2)
+        v = v.transpose(1, 2)
+
+        x = F.scaled_dot_product_attention(q, k, v, scale=self.scale)
+        x = x.transpose(1, 2).reshape(B, N, -1)
+
+        x = self.projection_layer(x)
+        return x
+
+
+class InternS1VisionMLP(nn.Module):
+
+    def __init__(
+        self,
+        config: PretrainedConfig,
+        quant_config: Optional[QuantizationConfig] = None,
+        prefix: str = "",
+    ) -> None:
+        super().__init__()
+
+        self.config = config
+        self.activation_fn = get_act_fn(config.hidden_act)
+        self.fc1 = ColumnParallelLinear(config.hidden_size,
+                                        config.intermediate_size,
+                                        bias=True,
+                                        quant_config=quant_config,
+                                        prefix=f"{prefix}.fc1")
+        self.fc2 = RowParallelLinear(config.intermediate_size,
+                                     config.hidden_size,
+                                     bias=True,
+                                     quant_config=quant_config,
+                                     prefix=f"{prefix}.fc2")
+
+    def forward(self, hidden_states: torch.Tensor) -> torch.Tensor:
+        hidden_states, _ = self.fc1(hidden_states)
+        hidden_states = self.activation_fn(hidden_states)
+        hidden_states, _ = self.fc2(hidden_states)
+
+        return hidden_states
+
+
+class InternS1VisionLayer(nn.Module):
+
+    def __init__(
+        self,
+        config: PretrainedConfig,
+        quant_config: Optional[QuantizationConfig] = None,
+        *,
+        num_dummy_heads: int = 0,
+        prefix: str = "",
+    ) -> None:
+        super().__init__()
+
+        self.attention = self._init_attn(config,
+                                         quant_config,
+                                         num_dummy_heads=num_dummy_heads,
+                                         prefix=f"{prefix}.attention")
+
+        self.mlp = InternS1VisionMLP(config,
+                                     quant_config=quant_config,
+                                     prefix=f"{prefix}.mlp")
+        self.layernorm_before = NORM2FN[config.norm_type](
+            config.hidden_size, eps=config.layer_norm_eps)
+        self.layernorm_after = NORM2FN[config.norm_type](
+            config.hidden_size, eps=config.layer_norm_eps)
+
+        init_values = config.layer_scale_init_value
+        self.lambda_1 = nn.Parameter(init_values *
+                                     torch.ones(config.hidden_size),
+                                     requires_grad=True)
+        self.lambda_2 = nn.Parameter(init_values *
+                                     torch.ones(config.hidden_size),
+                                     requires_grad=True)
+
+    def _init_attn(
+        self,
+        config: PretrainedConfig,
+        quant_config: Optional[QuantizationConfig],
+        *,
+        num_dummy_heads: int,
+        prefix: str = "",
+    ):
+        return InternSdpaAttention(config, num_dummy_heads=num_dummy_heads)
+
+    def forward(
+        self,
+        hidden_states: torch.Tensor,
+    ):
+        hidden_states = hidden_states + self.attention(
+            self.layernorm_before(hidden_states)) * self.lambda_1
+
+        hidden_states = hidden_states + self.mlp(
+            self.layernorm_after(hidden_states)) * self.lambda_2
+
+        return hidden_states
+
+
+class InternS1VisionEncoder(nn.Module):
+
+    def __init__(
+        self,
+        config: PretrainedConfig,
+        quant_config: Optional[QuantizationConfig] = None,
+        *,
+        num_hidden_layers_override: Optional[int] = None,
+        num_dummy_heads: int = 0,
+        prefix: str = "",
+    ):
+        super().__init__()
+
+        self.config = config
+
+        if num_hidden_layers_override is None:
+            num_hidden_layers = config.num_hidden_layers
+        else:
+            num_hidden_layers = num_hidden_layers_override
+
+        self.layer = nn.ModuleList([
+            InternS1VisionLayer(config,
+                                quant_config,
+                                num_dummy_heads=num_dummy_heads,
+                                prefix=f"{prefix}.layer.{layer_idx}")
+            for layer_idx in range(num_hidden_layers)
+        ])
+
+    def forward(self, inputs_embeds: torch.Tensor):
+
+        hidden_states = inputs_embeds
+        for encoder_layer in self.layer:
+            hidden_states = encoder_layer(hidden_states)
+
+        return hidden_states
+
+
+class InternS1VisionModel(nn.Module):
+
+    def __init__(
+        self,
+        config: PretrainedConfig,
+        quant_config: Optional[QuantizationConfig] = None,
+        *,
+        num_hidden_layers_override: Optional[int] = None,
+        num_dummy_heads: int = 0,
+        prefix: str = "",
+    ) -> None:
+        super().__init__()
+
+        self.config = config
+
+        self.embeddings = InternS1VisionEmbeddings(config)
+        self.encoder = InternS1VisionEncoder(
+            config=config,
+            num_hidden_layers_override=num_hidden_layers_override,
+            num_dummy_heads=num_dummy_heads,
+            prefix=f"{prefix}.encoder",
+        )
+        self.layernorm = (nn.Identity() if config.use_mean_pooling else
+                          nn.LayerNorm(config.hidden_size,
+                                       eps=config.layer_norm_eps))
+
+    def get_input_embeddings(self):
+        return self.embeddings.patch_embeddings
+
+    def forward(
+        self,
+        pixel_values: Optional[torch.Tensor] = None,
+        pixel_embeds: Optional[torch.Tensor] = None,
+    ) -> torch.FloatTensor:
+        if pixel_values is None and pixel_embeds is None:
+            raise ValueError(
+                'You have to specify pixel_values or pixel_embeds')
+
+        if pixel_embeds is not None:
+            hidden_states = pixel_embeds
+        elif pixel_values is not None:
+            if pixel_values.ndim == 4:
+                hidden_states, _ = self.embeddings(pixel_values)
+            else:
+                raise ValueError(
+                    f'wrong pixel_values size: {pixel_values.shape}')
+
+        encoder_outputs = self.encoder(inputs_embeds=hidden_states)
+        encoder_outputs = self.layernorm(encoder_outputs)
+
+        return encoder_outputs
+
+    def load_weights(self, weights: Iterable[tuple[str,
+                                                   torch.Tensor]]) -> set[str]:
+        params_dict = dict(self.named_parameters())
+        loaded_params: set[str] = set()
+        for name, loaded_weight in weights:
+            param = params_dict[name]
+            weight_loader = getattr(param, "weight_loader",
+                                    default_weight_loader)
+            weight_loader(param, loaded_weight)
+            loaded_params.add(name)
+        return loaded_params
diff --git a/vllm/model_executor/models/registry.py b/vllm/model_executor/models/registry.py
index 9b204fdcbe1a5..709b2eb37a3ed 100644
--- a/vllm/model_executor/models/registry.py
+++ b/vllm/model_executor/models/registry.py
@@ -203,6 +203,7 @@ _MULTIMODAL_MODELS = {
     "GraniteSpeechForConditionalGeneration": ("granite_speech", "GraniteSpeechForConditionalGeneration"),  # noqa: E501
     "H2OVLChatModel": ("h2ovl", "H2OVLChatModel"),
     "InternVLChatModel": ("internvl", "InternVLChatModel"),
+    "InternS1ForConditionalGeneration": ("interns1", "InternS1ForConditionalGeneration"),  # noqa: E501
     "Idefics3ForConditionalGeneration":("idefics3","Idefics3ForConditionalGeneration"),
     "SmolVLMForConditionalGeneration": ("smolvlm","SmolVLMForConditionalGeneration"),  # noqa: E501
     "KeyeForConditionalGeneration": ("keye", "KeyeForConditionalGeneration"),