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Bestony
5aeb03018c
OpenAI OAuth (ChatGPT) accounts deterministically reject plan-gated models with 400 "The 'X' model is not supported when using Codex with a ChatGPT account". Account selection had no capability filtering for this, so the scheduler kept picking the same account for the same model forever; every attempt burned an upstream call and surfaced to clients as a retryable 502, sustaining client retry storms. Treat this 400 like upstream model-not-found: mark the (account, model) pair via SetModelRateLimit (30min cooldown) so IsSchedulableForModelWithContext skips the account for that model during selection, and return true so the in-flight request fails over to another account through the existing UpstreamFailoverError path.