Startup profile · funding coverage
Braintrust
AI evaluation, observability, and prompt tooling for production LLM products.
Stage
series b
Status
private
Coverage
full
Why Braintrust is interesting
Used by Stripe, Notion, and Vercel for eval loops — a16z-led A with Greylock participation as evals become table stakes for shipping AI.
Key facts
- Series A (Oct 2024): $36M led by a16z for AI evals and LLM devtools (Braintrust blog)
- Series B: $80M with Greylock re-upping alongside a16z (company blog)
- Co-investors not in VCT directory: ICONIQ (Series B lead), Databricks Ventures, Datadog
- Source: https://www.braintrust.dev/blog/announcing-series-a
Investors in our directory
Funds linked from Braintrust's profile — open a fund page for stage focus and related deal articles.
Industries
AI & Machine Learning Developer Tools Enterprise SaaS
Industry hub pages are rolling out from our fund-derived baseline taxonomy.
Related funding articles
Venture Capital Tracker pieces that cover Braintrust's financing or category context.
FAQs about Braintrust
Funding context and why this company shows up in venture coverage.
Braintrust is dev infrastructure for shipping LLM features: eval datasets, automated scoring, prompt versioning, and production observability used by teams at Stripe, Notion, and Vercel.
Andreessen Horowitz (see /fund/andreessen-horowitz) led the $36M Series A in October 2024. Greylock Partners (see /fund/greylock-partners) participated in the $80M Series B alongside a16z.
Series B ($80M). ICONIQ led the B round per company disclosures; Braintrust remains private.
Evals and observability became table stakes for production AI — Braintrust sits in the same tooling layer as CI/CD but for non-deterministic model outputs.
No — Braintrust remains private.
Last updated: 2026-07-24