langchain

52e57cdc - docs: update multimodal PDF and image usage for gpt-4.1 (#31595)

docs: update multimodal PDF and image usage for gpt-4.1 (#31595) docs: update multimodal PDF and image usage for gpt-4.1 **Description:** This update revises the LangChain documentation to support the new GPT-4.1 multimodal API format. It fixes the previous broken example for PDF uploads (which returned a 400 error: "Missing required parameter: 'messages[0].content[1].file'") and adds clear instructions on how to include base64-encoded images for OpenAI models. **Issue:** error appointed in foruns for pdf load into api -> ''' @[Albaeld](https://github.com/Albaeld) Albaeld [8 days ago](https://github.com/langchain-ai/langchain/discussions/27702#discussioncomment-13369460) This simply does not work with openai:gpt-4.1. I get: Error code: 400 - {'error': {'message': "Missing required parameter: 'messages[0].content[1].file'.", 'type': 'invalid_request_error', 'param': 'messages[0].content[1].file', 'code': 'missing_required_parameter'}} ''' **Dependencies:** None **Twitter handle:** N/A --------- Co-authored-by: Chester Curme <chester.curme@gmail.com>