Braintrust review: Tracing, evals and monitoring for teams running AI agents in production
Tracing, evals and monitoring for teams running AI agents in production
Starts at $249/mo, free plan: yes, prices checked on October 29, 2026.
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What Braintrust does
Traces production LLM agents, scores their outputs with LLMs, code or humans, and runs evals that can gate releases.
Braintrust is a platform for watching and testing AI agents. It records production traces, including prompts, responses and tool calls, and lets teams score the outputs using LLM judges, code, or human reviewers. The same scorers can be used in offline experiments and on live traffic, and CI/CD gates can stop changes that lower quality. Datasets can be built from production traces, and a built-in assistant called Loop proposes prompts, scorers and datasets. A gateway and SDKs for Python, TypeScript, Go, Ruby and C# handle instrumentation, and an MCP server lets a coding agent query logs from an IDE.
Pricing has three tiers. Starter costs $0 / month and includes $10 in model credits, 1 GB of processed data, 10k scores and 14-day retention; extra data is +$4/GB and extra scores are +$2.50/1k. Pro costs $249 / month with $100 credits, 5 GB, 50k scores and 30-day retention, plus +$3/GB for extra data, +$1.50/1k for extra scores and $0.50 per GB per month for retention beyond the included period. Enterprise is custom pricing and adds custom retention, export and on-prem or hosted deployment. All three plans list unlimited users, projects, datasets, playgrounds and experiments. The pricing page shows one monthly figure per plan and no separate yearly price.
- Trace prompts, responses and tool calls
- Score with LLM judges, code or humans
- Loop agent for prompts, scorers and datasets
- Production traces to eval datasets
- CI/CD quality gates
- Gateway and SDK instrumentation
- Alerts on score, latency and error metrics
- MCP server for IDE use
Official video
How to use Jev in Braintrust · by Braintrust ·
The player loads only when you press play.
Good for / Not for
Good for
- Teams running AI agents in production that need trace inspection
- Teams that want to turn production failures into eval datasets
- Engineers who want CI/CD quality gates for prompt and model changes
Not for
- Anyone needing more than 14-day retention without paying (Starter limit)
- Buyers who want a fixed all-in price, since data and scores are billed beyond included amounts
How to start
Sign up on the free Starter plan; no credit card is required. source
Initialize the SDK once, or point your provider base URL at the gateway, to start tracing LLM calls. source
Build datasets from production logs and run an experiment with scorers. source
Add the CI/CD action so quality gates block bad changes. source
Limits and gotchas
From the official site and docs of Braintrust, checked on October 29, 2026.
Pros and cons
Pros
- Free Starter plan at $0 / month, no credit card required
- Unlimited users, projects, datasets, playgrounds and experiments on every plan
- Same scorers can run offline in experiments and online on production traffic
- SDKs for several languages plus a gateway and an MCP server
Cons
- Starter retention is only 14-day
- Processed data and scores are billed extra beyond included amounts (e.g. +$4/GB on Starter)
- Pro jumps to $249 / month
- Starter allows 1 human review score per project
- No yearly-billed price or free trial of paid plans is shown
Our take
Braintrust fits teams that already run LLM agents in production and want tracing, scoring and release checks in one place. The free Starter plan with no credit card makes it possible to try instrumentation before paying, and users and projects are not capped. The trade-offs are usage-based extras: processed data, scores and longer retention are billed beyond the included amounts, so costs depend on traffic. Starter keeps data for only 14 days, and the pages do not list a free trial of paid plans. Teams without agents or LLM features will find little use for it.
Comparisons and lists with Braintrust
Coming soon
Coming soon — we are writing comparisons that include Braintrust.
Braintrust pricing
| Plan | Monthly billing | Annual billing (per month) | Limits / what’s included |
|---|---|---|---|
| Starter per month | Free | — | $10 credits + tok rates; 1 GB processed data (+$4/GB); 10k scores (+$2.50/1k); 14-day retention; unlimited users, projects, datasets, playgrounds, experiments |
| Pro per month | $249 | — | $100 credits + tok rates; 5 GB processed data (+$3/GB); 50k scores (+$1.50/1k); 30-day retention then $0.50 per GB per month; 6–12 months free for qualifying startups |
| Enterprise custom pricing | — | — | Custom data retention and export, RBAC, premium support, on-prem or hosted deployment |
Free trial: none listed. Free plan: yes.
Prices checked on on the official Braintrust pricing page. “—” = not published.
All Braintrust plans, limits and annual prices →
Frequently asked questions
Is there a free plan?
Yes. Starter costs $0 / month, includes $10 in credits, 1 GB processed data, 10k scores and 14-day retention, and needs no credit card.
How much does Pro cost?
Pro is $249 / month and includes $100 credits, 5 GB processed data, 50k scores and 30-day retention. Overage is +$3/GB for data and +$1.50/1k for scores.
Are there seat limits?
The pricing page lists unlimited users on Starter, Pro and Enterprise.
Does Enterprise have a public price?
No. Enterprise is listed as custom pricing; you contact the vendor.
Which languages have SDKs?
The homepage names Python, TypeScript, Go, Ruby and C#, and says there are more.
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