idempotency_in_progress

Idempotent request in progress (HTTP 409)

HTTP status	409
OpenAI type	invalid_request_error
Anthropic type	invalid_request_error
Retry	Yes. Error responses carry x-should-retry: true.

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What it means

The first request with this Idempotency-Key is still running.

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What to do

Retry after the Retry-After delay (1 s). The SDKs do this for you.