Support new OpenAI `4.1` model

[raunakdoesdev]

Description

would like to see support for the 4.1 series:
platform.openai.com/docs/models/gpt-4.1

References

No response

[dmontagu]

I can confirm it works right now for me to use

weather_agent = Agent(
    'openai:gpt-4.1',
    ...
)

so I think this should be working now, you just need to manually specify the model name to use. We'll do a release tomorrow that will include the updated constants in KnownModelName etc. but you should still be able to use the new models with existing code by just manually specifying the name as appropriate.

[dmontagu]

I've opened #1479 to update the min OpenAI version and add the newly released models to the list of values in the model name Literal we expose (useful for autocomplete, etc.), but I'll note that you should NOT need to wait for a new release to start making use of the new OpenAI models — just use model='openai:gpt-4.1'/model='openai:gpt-4.1-mini' etc., or OpenAIModel(model_name='gpt-4.1', ...) etc. I tried it out and it seems to work fine for me on the currently released version of pydantic-ai.

Given all this, I'm going to close this issue (rather than wait for #1479 to be merged) but if anyone has issues with the new OpenAI models please either request that this issue is reopened or make a new issue. 🙏