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Mistral API error

Mistral API 401 Unauthorized: what it means and how to fix it

Error message
401 Unauthorized

Retry? Not statedLast verified 1 documented fix1 source

What it means

The API key is missing, invalid, or expired.

Causes

  • No Authorization header
  • Incorrect or revoked API key
  • Using a key from a different workspace

How to fix it

  1. Fix 1.

    Verify your API key in Studio > API keys and make sure the header uses this format:

    YAML
    Authorization: Bearer YOUR_API_KEY

More Mistral API errors

All 11 Mistral API errors

HTTP 401 at other providers

Compare 401 across providers

FAQ

What does the Mistral API error "401 Unauthorized" mean?

The API key is missing, invalid, or expired.

How do I fix Mistral API "401 Unauthorized"?

Verify your API key in Studio > API keys and make sure the header uses this format:

Should I retry Mistral API "401 Unauthorized"?

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

Which other AI APIs return HTTP 401?

Per their official error docs: Anthropic API (401 authentication_error), Azure OpenAI (401 Unauthorized), Cohere API (401 Unauthorized), DeepSeek API (401 - Authentication Fails), Gemini API (401 authentication), Groq API (401 Unauthorized), OpenAI API (401 Invalid Authentication; 401 Incorrect API key provided; 401 You must be a member of an organization to use the API; 401 IP not authorized), OpenRouter (401 authentication), Vertex AI (401 UNAUTHENTICATED), xAI API (401 Unauthorized).

Sources

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

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