How does Braintrust compare with the alternatives?
On Parlance Labs' 100 production traces, Braintrust Loop found the most failures and LangSmith Engine too few to score. Pick Braintrust for evals many people review, US$474 a month at 200,000 traces in GILD's calculation; pick LangSmith to host LangGraph agents too.
CREATE SOMETHING retired Braintrust for Langfuse in July 2026. Pick Langfuse to self-host its MIT-licensed core free; at 200,000 traces a month GILD's calculation puts Langfuse Pro at US$369 and Braintrust Pro at US$474. Pick Braintrust for a managed eval product whose data plane runs in your cloud only on Enterprise.
On Parlance Labs' 100 production traces, Braintrust Loop caught the most failures and 91% of Arize Alyx's flags were valid. Pick Arize to self-host free on Phoenix; pick Braintrust for Pro overage rates you can price, US$474 a month at 200,000 traces in GILD's calculation.
Fintool runs both: release evals in Braintrust, production monitoring in Datadog. Pick Datadog to watch agents beside APM, billed per LLM span; pick Braintrust when evals gate releases. At 200,000 traces a month the bills come within US$10 of each other.
