Braintrust
AI observability and evaluation platform for LLM agents in production.
About Braintrust
Braintrust (formerly at braintrustdata.com, now hosted at braintrust.dev) is an AI observability and evaluation platform for teams building and running AI agents and LLM-powered products in production. It covers three connected jobs: observing live traffic by inspecting prompts, responses, and tool calls in real time across large volumes of logged traces; evaluating quality by running experiments against a dataset with defined inputs, expected outputs, and scorers (LLM-based, code-based, or human) before shipping changes; and discovering patterns in production data through a feature called Topics, which can trigger quality gates that block a release if it regresses. Additional pieces include Loop, an AI-assisted optimization tool, custom scoring facets for business-specific dimensions, and Brainstore, the company's own database built for storing and querying complex agent traces at scale. The platform ships native SDKs for Python, TypeScript, Go, Ruby, and C#, is framework-agnostic, and includes MCP support for IDE integration. Braintrust is aimed at engineering and product teams running AI agents in production, from startups to enterprise, and lists customers including Vercel, Notion, Coursera, Dropbox, and Replit. It is SOC 2 Type II and HIPAA compliant with SSO and hybrid deployment options for regulated teams. One limitation: the site does not publish pricing or a founding year.
At a glance
- Company
- Braintrust
- Platforms
- Web, API
- API
- Available
- Last verified
- July 2026
Who It's For
- •AI researchers and developers.
- •Data scientists working with LLMs.
- •AI product teams seeking reliable evaluation tools.
- • enterprises needing scalable AI testing infrastructure.
- •Organizations requiring data security and compliance.
How It Works
- 1Users input prompts from any AI provider and assess their performance.
- 2The platform provides a prompt tweak feature to optimize prompts and track their effectiveness.
- 3It uses scorers to evaluate AI outputs against expected results, guiding improvements.
- 4Data management features enable collection, versioning, and secure integration of datasets.
- 5Real-time AI tracing visualizes model execution for debugging and optimization.
How to Use Braintrust
- 1Create or import prompts that you want to evaluate or refine.
- 2Run evaluations using the platform's UI or SDK to measure model performance.
- 3Adjust prompts and rerun evaluations to improve outputs.
- 4Use visualization tools to analyze model traces and debug issues.
- 5Collect and incorporate real-world data for ongoing monitoring and evaluation.
Key Features
- •Real-time trace observability
- •Dataset-based experiments with LLM/code/human scorers
- •Topics pattern discovery with release quality gates
- •Loop AI-assisted optimization
- •Brainstore trace database
- •Native SDKs for Python, TypeScript, Go, Ruby, C#
Use Cases
- •Trace and debug LLM agent behavior in production
- •Run evaluations before shipping prompt or model changes
- •Gate releases in CI/CD on quality regressions
- •Build eval datasets from production traces
Pros & Cons
Advantages
- •Comprehensive end-to-end platform integrating prompt evaluation, tracing, and datasets.
- •Supports self-hosting for full data control and compliance.
- •User-friendly interface suitable for both technical and non-technical users.
- •Real-time performance tracking and visualization.
Disadvantages
- •Primarily focused on evaluation, which may limit some development workflows.
- •Requires some technical knowledge to leverage SDK and advanced features.
- •Limited information on pricing and licensing details from available sources.
Alternatives
- LangSmith
- Langfuse
- Arize Phoenix
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Frequently Asked Questions
What is Braintrust?
Braintrust (formerly at braintrustdata. com, now hosted at braintrust.
How much does Braintrust cost?
Braintrust uses custom pricing — contact the vendor for a quote.
Is Braintrust free?
Braintrust is a paid tool and does not offer a free plan.
What are the best Braintrust alternatives?
Popular Braintrust alternatives include LangSmith, Langfuse, Arize Phoenix.
What is Braintrust used for?
Braintrust is commonly used for Trace and debug LLM agent behavior in production, Run evaluations before shipping prompt or model changes, Gate releases in CI/CD on quality regressions.
Does Braintrust have an API?
Yes, Braintrust offers an API for developers.
What platforms does Braintrust support?
Braintrust is available on Web, API.
Information Accuracy
Please note: While we regularly update all tool information including descriptions, features, pricing, and other details, this information may change over time as tools evolve and update their offerings. For the most current and accurate information, we recommend visiting the official website directly. Our goal is to provide you with comprehensive and up-to-date information to help you make informed decisions.