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The OpenCode session-header enforcement deadline is now visibly pulling fixes out of Zed and OpenCode itself
Zed v1.18.1 (2026-09-04) fixed OpenCode Go requests that could fail when Zed omitted the session header (#63715), and OpenCode v1.18.29 (2026-09-04) fixed Codex OAuth model filtering so integer GPT versions like `gpt-6` parse, unblocking gpt-6-astra for OpenAI subscription users. v1.18.28 started sending the session ID as GitHub Copilot's interaction header. This is the same September 6 enforcement date Manifest was racing on 09-04, so at least three independent projects have now shipped session-header work inside 48 hours of the cutoff.
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