Playground gateway error despite valid API keys

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Summary

Issue: The playground returns Braintrust gateway error: unknown model or provider not configured for all model selections from both OpenAI and Anthropic, even when valid API keys are configured in Settings → Models. Cause: Stale browser cache or cookies cause the UI to send outdated provider or model configuration state to the gateway. Resolution: Clear browser cookies and cache, then log out and back in.

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Resolution steps

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If the error occurs for all models across both providers and other users on the same org are unaffected

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Step 1: Clear browser cookies and cache

In your browser settings, clear cookies and cached data for braintrust.dev.

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Step 2: Log out and log back in

Sign out of Braintrust, restart the browser, then sign back in.

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Step 3: Verify in the playground

Open the affected playground and run a prompt using any model. The error should no longer appear.

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Otherwise, if the issue persists after clearing cache or the issue affects all users in the org, contact Braintrust support.