openai/gpt-5.3-chat-latest and openai/gpt-5.4 not working

[marctorsoc]

Bug Description

I was excited this morning to try openai/gpt-5.3-chat-latest after the release, but I'm getting

    raise APIStatusError(
livekit.agents._exceptions.APIStatusError: message='Error getting model definition', status_code=400, retryable=True,

in 1.4.5 defining it like this

inference.LLM(
            model="openai/gpt-5.3-chat-latest",
)

Same for openai/gpt-5.4

Expected Behavior

This should work since #5030 and also they are in the docs: https://docs.livekit.io/agents/models/llm/

Reproduction Steps

1. Explained above
2.
3.
...
- Sample code snippet, or a GitHub Gist link -

Operating System

mac

Models Used

No response

Package Versions

livekit==1.1.2
livekit-api==1.1.0
livekit-agents=1.4.5

Session/Room/Call IDs

No response

Proposed Solution

Additional Context

No response

Screenshots and Recordings

No response

[tinalenguyen]

Hi @marctorsoc, I just tested both openai/gpt-5.3-chat-latest and openai/gpt-5.4 and it worked for me. Could you try again now? If it still doesn't throws an error then I will flag this to our inference team