Feature Type

Would make my life easier

Feature Description

Feature Request

Problem

Some Azure OpenAI deployments only expose the Responses API endpoint (/openai/responses) instead of the traditional Chat Completions API (/chat/completions). This is
particularly true for newer models like gpt-5.1-codex-mini.

Currently, LiveKit agents only supports the Chat Completions API via LLM.with_azure(), which means these Responses API-only deployments cannot be used.

Proposed Solution

Add a new ResponsesLLM class that uses the OpenAI Responses API instead of Chat Completions. This would:

• Support Azure OpenAI deployments that only expose /openai/responses
• Maintain compatibility with existing ChatContext and function tool patterns
• Handle the different request/response formats internally

Use Case

Azure OpenAI users deploying newer models (e.g., gpt-5.1-codex-mini) that are only available via the Responses API endpoint.

References

• OpenAI Responses API
• Azure OpenAI Responses API

Workarounds / Alternatives

No response

Additional Context

No response