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dayvidborges 52e57cdc20 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>

2025-06-14 17:52:01 -04:00