Send model routing hints to the Codex backend - #37345
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copyberry[bot] merged 1 commit intoAug 7, 2026
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## What changed - Add an `x-codex-routing-hint` header containing the request model and, when selected, the service tier. - Send the hint on Responses HTTP requests, remote compaction requests, and WebSocket handshakes, including prewarm connections. - Limit the header to Codex-backend authentication with the OpenAI provider, omitting it for API-key and provider-specific credential paths. ## Testing - Cover routing hints for HTTP, remote compaction, WebSocket streaming, and tiered prewarming, along with the credential paths where the header must be absent. GitOrigin-RevId: d8d415d7fadddecf9a132d05920b856a35ac9960
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Send model routing hints to the Codex backend
What changed
x-codex-routing-hintheader containing the request model and, when selected, the service tier.Testing