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_convert_chat_completions_blocks_to_responses() — langchain Function Reference

Architecture documentation for the _convert_chat_completions_blocks_to_responses() function in base.py from the langchain codebase.

Function python LangChainCore LanguageModelBase called by 2

Entity Profile

Dependency Diagram

graph TD
  57d40c25_4875_99e8_1bae_5dd1aad3c2b3["_convert_chat_completions_blocks_to_responses()"]
  2b046911_ea21_8e2e_ba0d_9d03da8d7bda["base.py"]
  57d40c25_4875_99e8_1bae_5dd1aad3c2b3 -->|defined in| 2b046911_ea21_8e2e_ba0d_9d03da8d7bda
  b1594e89_965d_0f6c_e9b0_511a58b3e737["_ensure_valid_tool_message_content()"]
  b1594e89_965d_0f6c_e9b0_511a58b3e737 -->|calls| 57d40c25_4875_99e8_1bae_5dd1aad3c2b3
  b988bc7d_ceff_06f1_193c_a22abc7a149f["_construct_responses_api_input()"]
  b988bc7d_ceff_06f1_193c_a22abc7a149f -->|calls| 57d40c25_4875_99e8_1bae_5dd1aad3c2b3
  style 57d40c25_4875_99e8_1bae_5dd1aad3c2b3 fill:#6366f1,stroke:#818cf8,color:#fff

Relationship Graph

Source Code

libs/partners/openai/langchain_openai/chat_models/base.py lines 3979–4002

def _convert_chat_completions_blocks_to_responses(
    block: dict[str, Any],
) -> dict[str, Any]:
    """Convert chat completions content blocks to Responses API format.

    Only handles text, image, file blocks. Others pass through.
    """
    if block["type"] == "text":
        # chat api: {"type": "text", "text": "..."}
        # responses api: {"type": "input_text", "text": "..."}
        return {"type": "input_text", "text": block["text"]}
    if block["type"] == "image_url":
        # chat api: {"type": "image_url", "image_url": {"url": "...", "detail": "..."}}  # noqa: E501
        # responses api: {"type": "image_url", "image_url": "...", "detail": "...", "file_id": "..."}  # noqa: E501
        new_block = {
            "type": "input_image",
            "image_url": block["image_url"]["url"],
        }
        if block["image_url"].get("detail"):
            new_block["detail"] = block["image_url"]["detail"]
        return new_block
    if block["type"] == "file":
        return {"type": "input_file", **block["file"]}
    return block

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Source

Frequently Asked Questions

What does _convert_chat_completions_blocks_to_responses() do?
_convert_chat_completions_blocks_to_responses() is a function in the langchain codebase, defined in libs/partners/openai/langchain_openai/chat_models/base.py.
Where is _convert_chat_completions_blocks_to_responses() defined?
_convert_chat_completions_blocks_to_responses() is defined in libs/partners/openai/langchain_openai/chat_models/base.py at line 3979.
What calls _convert_chat_completions_blocks_to_responses()?
_convert_chat_completions_blocks_to_responses() is called by 2 function(s): _construct_responses_api_input, _ensure_valid_tool_message_content.

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