What do HTTP status codes like 401, 429 and 503 mean?

ExplainerUpdated November 2, 2026

Every response starts with a status code:

Range	Meaning	Model API examples
2xx	Success	200
4xx	Something about your request needs to change	400 bad body, 401 key problem, 402 no credits, 403 not allowed, 404 wrong model or path, 410 retired model, 413 too large, 429 too many requests
5xx	A temporary problem on the server	502, 503, 504

The body's error.code gives the exact reason. Retry 429 and 5xx; fix the request for other 4xx codes.

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