update OpenAI models in modelname_to_contextsize

[1951FDG]

Checked

• I searched existing ideas and did not find a similar one
• I added a very descriptive title
• I've clearly described the feature request and motivation for it

Feature request

hey there, looks like a lot of newer models are missing, who is (responsible / supposed) to keep model_token_mapping in method modelname_to_contextsize up-to-date?

langchain/libs/partners/openai/langchain_openai/llms/base.py

Line 495 in 0c10ff6

def modelname_to_contextsize(modelname: str) -> int:

Motivation

otherwise one has to write their own method, submit a pull request, etc...

Proposal (If applicable)

No response