feat(openai): add responses/compact support

[shekohex]

Summary

• add /v1/responses/compact routing and handler
• route compact requests through openai-compat and codex executors
• drop stream when forwarding compact requests
• avoid injecting empty prompt_cache_key for codex requests
• extend OpenAI usage parsing and add compact tests

Testing

• mise exec go -- go test ./...

[luispater]

How do I trigger /responses/compact in Codex?

[shekohex]

How do I trigger /responses/compact in Codex?

Run /compact to compact the of the conversation.

[luispater]

Can't hit this endpoint with codex-cli 0.91.0. What's your version?

[q2019715]

Can't hit this endpoint with codex-cli 0.91.0. What's your version?

v0.91.0

[shekohex]

@luispater Yes, as @q2019715 showed, you would go into codex and run /compact command.

[luispater]

@luispater Yes, as @q2019715 showed, you would go into codex and run /compact command.

I executed /compact, but I don't see any API calls hitting the /responses/compact endpoint.

[shekohex]

@luispater Yes, as @q2019715 showed, you would go into codex and run /compact command.

I executed /compact, but I don't see any API calls hitting the /responses/compact endpoint.

You should start a chat first, ask it some questions then execute the command.

Also pull my latest changes.

[hkfires]

@luispater Yes, as @q2019715 showed, you would go into codex and run /compact command.

I executed /compact, but I don't see any API calls hitting the /responses/compact endpoint.

Me too, only request /v1/responses, with codex cli v0.92.0
[2026-01-28 11:57:30] [b0eb5759] [info ] [gin_logger.go:93] 200 | 12.921s | X.X.X.X | POST "/v1/responses"

[shekohex]

@hkfires @luispater
You have to chat a bit with the model:

Here is a screenshot of the logs: