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Code: chat_cancel_target_already_terminal HTTP status: 409 Type: invalid_request

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When it fires

POST /v1/chat/completions/{id}/cancel was called on a completion whose status is already terminal — completed, failed, or any cancelled_* flavour. Treat as an idempotency hint: a normal completion arrived before your cancel signal did. Not a bug.

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How to recover

Read GET /v1/chat/completions/{id} for the final-state record (with its usage block and credits_charged). If you raced the completion, the partial-or-full charge has already been committed against your balance.