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HTTP 422 Unprocessable Content

The request was well-formed syntactically but semantically invalid.

4xx · Client error✗ not retryable — fix the request instead

In AI APIs specifically

Some providers use 422 instead of 400 for parameter validation failures — the error body carries the field-level details.

Fix checklist

  • Read the validation errors in the response body.
  • Check enum values and parameter ranges against the API reference.

Spec: RFC reference

Related status codes

400 Bad Request

The server cannot process the request due to a client error — malformed JSON, invalid parameters, or schema violations..

401 Unauthorized

Authentication is missing or invalid for this request..

402 Payment Required

The request requires payment — billing is not set up or a balance is exhausted..

403 Forbidden

The server understood the request but refuses to authorize it — valid credentials, insufficient permission..

← All HTTP status codes