#anthropic api key

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lunar anchor
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do i need to add use my own anthropic api key in openrouter? Getting this error in chat
(Anthropic) Provider returned error: {"type":"error","error":{"type":"authentication_error","message":"invalid x-api-key"},"request_id":"req_011CUs5az......"}

daring tulipBOT
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I'm an AI assistant - my answers may be incorrect and I cannot see screenshots. Please verify information with the OpenRouter docs.

To clarify your issue:

  • Are you using OpenRouter credits, or are you trying to use your own Anthropic (BYOK) API key with OpenRouter?
  • Which exact Anthropic model identifier are you using (e.g., anthropic/claude-3.5-haiku)?
  • Did you enter an Anthropic API key anywhere in the OpenRouter dashboard or your code? If so, please specify how.

The error “invalid x-api-key” suggests your Anthropic API key is either missing or incorrect. OpenRouter allows you to use either:

  1. OpenRouter’s own shared API credentials, where you’re billed via OpenRouter credits, or
  2. Your own Anthropic API key (Bring Your Own Key, BYOK)—available for eligible models/users.

For more, see: “1M free BYOK requests per month! Learn more” and browse Anthropic models Anthropic Model List.

Please provide the details above so I can help you further.

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lunar anchor
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  • using openrouter credits
  • claude opus 4.1
  • no
daring tulipBOT
#

Thank you for the details.

You do NOT need to provide your own Anthropic API key when using OpenRouter credits. Just use your OpenRouter API key in the Authorization header. The correct setup is:

Authorization: Bearer sk-or-v1-your-key-here

According to the OpenRouter documentation, you only need your OpenRouter API key to access models like anthropic/claude-opus-4.1. There is no mention of needing an Anthropic API key for standard OpenRouter credit usage Claude Opus 4.1 - API.

If you see “invalid x-api-key”:

  • Double-check that you’re using your OpenRouter API key, not an Anthropic key.
  • Make sure you are sending requests to https://openrouter.ai/api/v1.
  • Confirm your API key in your key settings API Keys.

If the issue continues with the correct OpenRouter API key, contact mods through the Discord server for support. For billing or account issues, email [email protected].

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Model Not Found | OpenRouter

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