cached_token_details is missing from realtime_response_usage

[jverkoey]

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

InputTokenDetails has the following structure when using the realtime API:

InputTokenDetails(audio_tokens=0, cached_tokens=192, text_tokens=239, cached_tokens_details={'text_tokens': 192, 'audio_tokens': 0})

But the InputTokenDetails type has the following definition:

class InputTokenDetails(BaseModel):
    audio_tokens: Optional[int] = None
    """The number of audio tokens used in the Response."""

    cached_tokens: Optional[int] = None
    """The number of cached tokens used in the Response."""

    text_tokens: Optional[int] = None
    """The number of text tokens used in the Response."""

Note that cached_tokens_details is missing.

To Reproduce

See the above.

Code snippets

OS

macOS

Python version

Python v3.13

Library version

v1.78.0