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Summary

For EU organizations, entering an OpenAI API key in Braintrust can trigger a validation error because automatic key validation targets the global OpenAI endpoint instead of the EU base URL. Configure OpenAI as a custom provider with the EU OpenAI API key and explicitly set the EU API base URL. Use Test to validate against the configured endpoint. A validation error from entering the key does not establish whether the EU endpoint works. Once configured, use the custom provider for requests.

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Applies to

Plans: Any Deployments: Any

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Configuration steps

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Step 1: Configure custom provider

Go to Settings > AI providers. Click Organization provider or Project provider, then select Custom providers > New.

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Step 2: Enter credentials

  1. Choose OpenAI under Provider and enter a provider name, such as OpenAI EU.
  2. Choose API key authentication and enter your EU OpenAI API key.
  3. On the Form tab, set API base URL to https://eu.api.openai.com/v1.
  4. Set Authorization header format to Bearer.

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Step 3: Test and save

  1. Click Test to validate the key against the configured EU endpoint. If this test fails, check the key and endpoint before proceeding.
  2. Click Create to save the provider, or Update when editing an existing provider.
  3. Browse and test models to run a request through this provider.
In your playground, prompt, or Gateway request, select or route to the custom OpenAI EU provider.