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Applies to:


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Summary

Issue: When using the Braintrust SDK to fetch prompts configured for GPT-5 models, the returned prompt parameters include temperature: 0 even though GPT-5 models don’t support the temperature parameter. This causes errors when passing these parameters directly to OpenAI’s API. Cause: Braintrust prompt storage includes temperature parameters for all models, but GPT-5 models reject any temperature setting in API calls. Resolution: Filter out the temperature parameter from prompt parameters before sending to OpenAI, or use Braintrust’s AI proxy which handles this automatically.

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Resolution Steps

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Step 1: Remove temperature from fetched parameters

Filter out the temperature parameter when using GPT-5 models before calling OpenAI.

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Option 2: Use Braintrust AI proxy

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Step 1: Use wrap_openai instead

TODO: Verify if using the wrapped OpenAI client automatically filters unsupported parameters like temperature for GPT-5 models.