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fix(core): send Codex session headers with ChatGPT token sharing - #53767
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ChatGPT token sharing only sent prompt_cache_key, while the legacy Codex route also sends a session-id header that ChatGPT uses for prompt-cache affinity. Send session-id, thread-id, and x-client-request-id on token-sharing requests the way the Codex client does.
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Summary
Sign in with ChatGPT (token sharing) requests go to
api.openai.com/v1with only the sharedprompt_cache_key. The legacy Codex route also sends asession-idheader, which ChatGPT uses for prompt-cache affinity, and Codex itself sendssession-id,thread-id, andx-client-request-id. Testing showed token-sharing cache reuse near zero while the Codex route caches normally (#53765).This adds a
model.requesthook to the token-sharing plugin that sends:session-id: the session's cache-affinity ID (the parent for child sessions, matching the Codex route)thread-idandx-client-request-id: the current session IDAPI-key OpenAI connections and the Codex route are unchanged.
This is an experiment: whether the token-sharing backend actually routes its cache on these headers still needs a live check.
Tests
bun test test/plugin/provider-chatgpt.test.ts test/plugin/provider-openai.test.tsbun run typecheckinpackages/coreRefs #53765
Requested by: @rekram1-node (Aiden Cline via Slack)