# Braintrust: Information technology & services, San Francisco, United States

> Braintrust: Braintrust is an AI observability platform founded in 2023 and based in San Francisco, California. Based in San Francisco, United States.

Source: https://millionrounds.com/startup/braintrust (Millionrounds; every figure on the page links to its filing or article)

United States · [Information technology & services startup](https://millionrounds.com/companies)

# Braintrust

Braintrust is an AI observability platform founded in 2023 and based in San Francisco, California.

Funding reported Last round: Series B

Information technology & services San Francisco, United States

Company summary

- **Founded:** 2023 3 years old
- **Team:** 170 51 to 200 people
- **Funding reported:** $121M in dollars
- **Last round:** Series B Feb 2026

How sure we are

- ✓ **Listed** We know it exists and what it does
- 2 **Funding reported** A company dataset reports a raise
- 3 **Observed** A filing or a dated announcement confirms a round

No round for Braintrust has been confirmed by a filing or an announcement yet, so nothing here counts toward an investor's record. [How we decide](https://millionrounds.com/methodology)

## About Braintrust

Braintrust is an AI observability platform founded in 2023 and based in San Francisco, California.

The company focuses on helping teams measure, evaluate, and improve AI systems in production. By integrating evaluations and observability into a single workflow, Braintrust enables users to understand AI behavior in real-world environments and provides tools to enhance performance. The platform offers a unified solution for comparing models, testing prompts, and catching regressions, utilizing real user data to continuously improve AI applications. It also provides an enterprise-grade AI stack that includes tools for evaluations, prompt playgrounds, and data management. Braintrust serves enterprise AI teams at leading technology companies such as Notion, Stripe, Zapier, Vercel, and Ramp, helping them optimize their AI systems effectively.

## What company datasets say Braintrust raised

Funding, as reported

Reported in all **$121M** in dollars

Last round **Series B**

Last round size **$80M**

Last round date **Feb 2026**

## On 3 portfolio pages

Investors who name them

- [ICONIQ Capital](https://millionrounds.com/fund/iconiq-capital)
- [Iconiq Capital](https://millionrounds.com/fund/iconiq-capital-3)
- [Ryan Hoover](https://millionrounds.com/fund/ryan-hoover)

Each firm lists Braintrust on its own website. That is the firm's claim, a weaker thing than a round we watched, but a named source.

## The company, in detail

What they build

Known for

enterprises real-time alerts ai data logs ai infrastructure information technology & services ai evaluation platform data management synthetic data enterprise software information technology api integration model monitoring access control model comparison tools model testing log analysis

Built with from their website

KaTeX GitHub Actions Docker Git Google Tag Manager Amazon CloudFront dbt CallMiner Eureka TypeScript Redis

+8 more

Google Cloud Linkedin Insight Tag YouTube GitHub Google Workspace Zoom Meetings CloudFlare Viewport Meta

- **Sector:** Information technology & services
- **Industry code:** NAICS 51321, SIC 7375, 7372
- **Region:** California

## Information technology & services in United States

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- [**Harvey** San Francisco · founded 2022 *Raised*](https://millionrounds.com/company/harvey)

## Is this your company?

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