Confirm this is an issue with the Python library and not an underlying OpenAI API

• This is an issue with the Python library

Describe the bug

Release 1.16.1 broke clients by deferring the build if pydantic models. As a result, doing a model_dump() on an object returned by the library can fail.

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While this speeds up build times, it should be considered a breaking change and ideally, avoided.

If the speedup is significant, we would request not using a generic envvar like DEFER_PYDANTIC_BUILD to revert the change, instead using something like OPENAI_PYDANTIC_DEFER_BUILD.

We noticed this issue with a streaming tool call message, and are not sure if other deep classes exhibit this behaviour.

To Reproduce

1. Create a streaming tool call chat completion message.
2. Call model_dump() on the object.
3. Observe stack trace in pydantic serializer code.

Code snippets

No response

OS

macOS, Linux

Python version

Python v3.11.8

Library version

openai v1.16.1