diff --git a/requirements/common.txt b/requirements/common.txt
index e7bc5682a6966..1a8fea0dd7d93 100644
--- a/requirements/common.txt
+++ b/requirements/common.txt
@@ -12,7 +12,7 @@ tokenizers >= 0.21.1  # Required for fast incremental detokenization.
 protobuf # Required by LlamaTokenizer.
 fastapi[standard] >= 0.115.0 # Required by FastAPI's form models in the OpenAI API server's audio transcriptions endpoint.
 aiohttp
-openai >= 1.99.1, < 1.100.0  # For Responses API with reasoning content
+openai >= 1.99.1  # For Responses API with reasoning content
 pydantic >= 2.10
 prometheus_client >= 0.18.0
 pillow  # Required for image processing
diff --git a/requirements/docs.txt b/requirements/docs.txt
index 87a44fc99da14..a24b9c7e924bf 100644
--- a/requirements/docs.txt
+++ b/requirements/docs.txt
@@ -18,7 +18,7 @@ cbor2
 cloudpickle
 fastapi
 msgspec
-openai < 1.100.0
+openai
 openai-harmony
 partial-json-parser
 pillow
diff --git a/vllm/entrypoints/openai/protocol.py b/vllm/entrypoints/openai/protocol.py
index 543701ed144ee..61f1a09d3ac1c 100644
--- a/vllm/entrypoints/openai/protocol.py
+++ b/vllm/entrypoints/openai/protocol.py
@@ -20,7 +20,15 @@ from openai.types.chat.chat_completion_message import (
 from openai.types.responses import (ResponseFunctionToolCall,
                                     ResponseInputItemParam, ResponseOutputItem,
                                     ResponsePrompt, ResponseReasoningItem,
-                                    ResponseStatus, ResponseTextConfig)
+                                    ResponseStatus)
+
+# Backward compatibility for OpenAI client versions
+try:  # For older openai versions (< 1.100.0)
+    from openai.types.responses import ResponseTextConfig
+except ImportError:  # For newer openai versions (>= 1.100.0)
+    from openai.types.responses import (ResponseFormatTextConfig as
+                                        ResponseTextConfig)
+
 from openai.types.responses.response import ToolChoice
 from openai.types.responses.tool import Tool
 from openai.types.shared import Metadata, Reasoning