OpenAI API separates slow_down 429s from server_is_overloaded 503s

UpdateSep 2, 2026VerifiedAdded Sep 22, 2026

Traffic ramping too quickly now returns 429 slow_down, while temporary model overload returns 503 server_is_overloaded. Honor Retry-After when present, otherwise use exponential backoff.

Developer tools

Read OpenAI's release notes

https://developers.openai.com/api/docs/changelog#sep-2

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