Question: any interest in OpenAI Responses API support for Codex compatibility?

[alessandrobologna]

Hi,

First, thanks for publishing ds4. I have been experimenting with it in the last couple of days, both on an M3 Ultra 512 and an M5 128, with both quants, and it's really working well for me (at least for what I have tested it with: opencode and pi).

I wanted to try it as well with Codex, but now it requires using the Responses API, which is not yet supported here, and so I had Codex with GPT-5.5 build support for it... Modern times dogfooding ;)

For reference, here is the merged PR in my fork:
alessandrobologna#1

The implementation currently:

• adds /v1/responses endpoint with Responses-style request parsing and Responses SSE streaming events
• extends tool-schema handling to support Responses tools, tool search tools, and namespaced tools, preserving wire name + namespace
• updates README to document the new endpoint and Codex usage via wire_api = "responses"

I'd be happy to contribute it, or maybe you can just use it as a starting point to look at. Either way works. So no worries at all if this is outside the direction you have in mind. I just wanted to ask first before sending a larger compatibility PR.

Cheers, and thanks again for working on this.

[alessandrobologna]

Hi,
FYI, I rebased the Responses API branch on the latest upstream main, so it should be easier to look at without also having to account for old conflicts.

Branch:
https://github.com/alessandrobologna/ds4/tree/feature/responses-api

Current branch tip:
0544533dd52b7f6847f6264c7ec2d9f19c9db91c

Upstream commit it is based on:
e88a51fdac110ca5c0e0da06f1a27d4c0313b563

This branch includes the original Responses endpoint work plus the follow-up fixes needed after the newer DSML / KV replay changes landed upstream. Just leaving the current pointer here in case it becomes useful at some point.