Retry-After when the response has one. Errors never cost API credits.
Calls still running hold the API credits this call needs. Retry after Retry-After seconds; this happens when many calls run in parallel near the end of the allowance.
What to do: Retry in a few seconds.
Response
application/problem+json (RFC 9457) and has a Request-Id header with the same request_id. See all errors.