Claude API Error Codes

Error Codes

400

invalid_request_error

There was an issue with the format or content of your request. We may also use this error type for other 4XX status codes not listed below.

401

authentication_error

There’s an issue with your API key.

403

permission_error

Your API key does not have permission to use the specified resource.

404

not_found_error

The requested resource was not found.

413

request_too_large

Request exceeds the maximum allowed number of bytes. The maximum request size is 32 MB for standard API endpoints.

429

rate_limit_error

Your account has hit a rate limit.

500

api_error

An unexpected error has occurred internal to Anthropic’s systems.

529

overloaded_error

The API is temporarily overloaded.