What happened: Fork the loop

Pydantic Logfire now accepts Braintrust SDK eval runs via a compatibility endpoint, requiring only two environment variable changes.

Why it matters: Fork the loop

Engineers maintaining existing Braintrust eval infrastructure who want to consolidate observability without rewriting evaluation code.

Watch out: Fork the loop

Braintrust-hosted datasets, prompts, functions, remote parameters, and server-side scoring are not supported; only Python 0.30.1 and TypeScript 3.24.0 SDKs are verified.

In the news

Fork the loop

Pydantic · Bill Easton · Published August 5, 2026 · 3 min read

In 30 seconds

What happened: Pydantic Logfire now accepts Braintrust SDK eval runs via a compatibility endpoint, requiring only two environment variable changes.
Why it matters: Engineers maintaining existing Braintrust eval infrastructure who want to consolidate observability without rewriting evaluation code.
Watch out: Braintrust-hosted datasets, prompts, functions, remote parameters, and server-side scoring are not supported; only Python 0.30.1 and TypeScript 3.24.0 SDKs are verified.

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