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xAI API error

xAI API 400 Bad Request: what it means and how to fix it

Error message
400 Bad Request

Retry? Not statedLast verified 1 documented fix1 source

What it means

Returned on all endpoints when the request is invalid. The docs list an invalid argument in a POST body, an invalid URL param on a GET dynamic route, or an incorrect API key as causes.

Causes

  • A POST request body specified an invalid argument
  • A GET request with a dynamic route has an invalid URL param
  • An incorrect API key was supplied

How to fix it

  1. Fix 1.

    Check your request body or request URL.

More xAI API errors

All 18 xAI API errors

HTTP 400 at other providers

Compare 400 across providers

FAQ

What does the xAI API error "400 Bad Request" mean?

Returned on all endpoints when the request is invalid. The docs list an invalid argument in a POST body, an invalid URL param on a GET dynamic route, or an incorrect API key as causes.

How do I fix xAI API "400 Bad Request"?

Check your request body or request URL.

Should I retry xAI API "400 Bad Request"?

Not stated. The official docs do not say whether this error is retryable.

Which other AI APIs return HTTP 400?

Per their official error docs: Amazon Bedrock (400 ValidationException; 400 ServiceQuotaExceededException; 400 IncompleteSignature; 400 InvalidAction; 400 NotAuthorized; 400 RequestExpired), Anthropic API (400 invalid_request_error; 400 invalid_request_error (spend limit reached)), Azure OpenAI (400 Bad Request; 400 content_filter), Cohere API (400 Bad Request; 400 Bad Request (too many tokens)), DeepSeek API (400 - Invalid Format), Gemini API (400 invalid_request; 400 failed_precondition; 400 parameter_unknown; 400 INVALID_ARGUMENT; 400 FAILED_PRECONDITION), Groq API (400 Bad Request), Mistral API (400 Bad request), OpenAI API (400 invalid_request_error (Invalid service_tier argument); 400 BadRequestError), OpenRouter (400 invalid_request; 400 invalid_prompt; 400 context_length_exceeded; 400 max_tokens_exceeded; 400 token_limit_exceeded; 400 string_too_long; 400 invalid_image; 400 image_too_large; 400 image_too_small; 400 unsupported_image_format; 400 image_download_failed), Vertex AI (400 INVALID_ARGUMENT / FAILED_PRECONDITION).

Sources

Last verified against 1 source: xAI API's official docs and official SDK repositories.

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