Fork the loop

Logfire offers a Braintrust compatibility endpoint that lets users redirect existing Python and TypeScript evaluation workflows to Logfire by changing the app URL and API key environment variables, without rewriting local datasets, tasks, scorers, or CI integrations. Compatible future runs are recorded as OpenTelemetry data and appear alongside application traces, model calls, retrieval, tools, logs, metrics, and infrastructure telemetry, while historical Braintrust data is not imported or duplicated. Verified support includes Braintrust Python 0.30.1 and TypeScript 3.24.0 evaluation runs with local workflow features such as multiple scores, metadata, tags, trials, and child spans, while other SDK languages remain in early access. Braintrust-hosted capabilities including datasets, prompts, functions, remote parameters, attachments, BTQL, model proxying, server-side scoring, and public sharing are not currently supported, and model-based scorers require explicit provider clients. In Logfire’s Evals workspace, users can review experiment results and traces, use beta human-review queues, compare baselines, and turn production findings into version-controlled regression cases through Pydantic Evals, with a reversible migration encouraged through staging or canary testing.

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