Bespoke Labs

Commercial

medium confidence

www.bespokelabs.ai ↗ · Status: active confirmed · Founded 2024

Bespoke Labs is an applied AI research lab (Mountain View, CA, founded 2024) focused on data curation and RL-environment curation for training and evaluating agents, known for open datasets and reproducible recipes (OpenThoughts) and open-source tools (Curator, Evalchemy). It pairs a public open-source/open-data presence with commercial custom data and RL-environment delivery.

Key facts

Headquarters

Mountain View, California, USAconfirmed cite

Headcount band

11-50reported cite

Total raised

$7.25Mconfirmed cite

Last round

~$7.25M raised ~May/June 2024; round stage ambiguous across sources (Luma/Form D context suggest Seed; Tracxn/Crunchbase label Series A 2024-05-22)reported cite

SOC 2

unknown

What they sell

mixed (data/RL-environment curation, open datasets and evals, and custom data delivery to enterprises and labs)reported cite

Open source

yesconfirmed cite

Deployment

mixed, open-source libraries/datasets (self-hosted) plus custom data/RL-environment delivery via direct engagement; Curator integrates with provider APIs (OpenAI/Anthropic, etc.)reported cite

Scale & velocity

Current headcount

~40-48 employees (40 as of 2026-04-30 per Tracxn; ~48 profiles listed on LinkedIn page)reported cite

Headcount growth

unknown (LinkedIn growth posts reference recent hiring but no formal % disclosed) cite

Open roles

several open roles (e.g. RL Environments, Research Engineer, Data Operations Manager, DevOps Engineer, Technical Recruiter) on Ashby; exact count not reliably extractable from public pagereported cite

Other locations

unknown

Distributed / remote

yesreported cite

Research depth

Has researchers

yesconfirmed cite

Researcher count

unknown (research-led team; exact count not extractable from public team page) cite

Backgrounds

Co-founder/CEO Maheswaran (Mahesh) Sathiamoorthy, ex-Google DeepMind, Co-founder/Chief Scientist Georgios (Alex) Dimakis, Professor, UC Berkeley (formerly UT Austin), Team members with backgrounds from Google, UC Berkeley, Stanford, NYU, Microsoft, Scale AI, AI2 (per vendor about-us page)reported cite

Papers / benchmarks

OpenThoughts / OpenThoughts-114k, open reasoning dataset (collaboration with DataComp community; 190+ public models trained on it per GitHub), Bespoke Curator, synthetic data curation library, Evalchemy, evaluation/benchmark tooling, Bespoke-Stratos / OpenThinker reasoning models, Bespoke-MiniCheck, factuality modelreported cite

Capital

Total raised

$7.25M (SEC Form D: $7,249,998 sold)confirmed cite

Last round

~$7.25M raised ~May/June 2024; round stage ambiguous across sources (Luma/Form D context suggest Seed; Tracxn/Crunchbase label Series A 2024-05-22)reported cite

Investors

unknown

Valuation

unknown

Revenue signals

unknown

Security & compliance

SOC 2

unknown

Other certifications

unknown

Security page

unknown

Product

What they sell

mixed (data/RL-environment curation, open datasets and evals, and custom data delivery to enterprises and labs)reported cite

Open source

yesconfirmed cite

License

Apache-2.0 (Curator, SkyRL); MIT (Verifiers fork); OpenThinker/OpenThoughts artifacts Apache-2.0confirmed cite

Deployment model

mixed, open-source libraries/datasets (self-hosted) plus custom data/RL-environment delivery via direct engagement; Curator integrates with provider APIs (OpenAI/Anthropic, etc.)reported cite

Maturity

GA (open-source tools publicly available; commercial data delivery via direct contracts)estimated cite

Notable customers

Fortune 500 enterprises (unnamed) self-claimed ⚑Frontier labs / top labs (unnamed) self-claimed Model builders using OpenThoughts datasets (190+ public HF models; unnamed) self-claimed cite

Buyer analysis

Best fit: Buyers needing reasoning-focused data curation, open reproducible datasets/recipes, and custom RL-environment/eval data delivery from a research-led team.

How we verified this

Independently re-verified via WebSearch and WebFetch (SEC Form D, LinkedIn public snippet, Tracxn, GitHub/OpenThoughts) on 2026-06-07. Confirmed this is the CORRECT company matching the 'open data and reproducible recipes' note: Bespoke Labs (Mountain View, CA), founders Alex Dimakis and Mahesh Sathiamoorthy, maker of Curator and OpenThoughts. Funding: SEC Form D confirms $7,249,998 sold (filed 2024-06-04), total_raised kept 'confirmed' on the dollar figure; round stage left 'reported' due to Seed-vs-Series-A conflict across aggregators. No named investors are publicly disclosed (Crunchbase inaccessible/403; Tracxn/PitchBook surface no lead), notable_investors stays unknown; the Bhaskar Ghosh/8VC inference was correctly NOT asserted as an investor. Headcount ~40 (Tracxn, 2026-04-30) to ~48 (LinkedIn), band 11-50, well below 200+. notable_customers remain self-claimed (no third-party-verified named customers; frontier-lab ties are vendor-asserted and unnamed). Downgraded over-confident vendor-sourced fields (what_they_sell, researcher_backgrounds, published_papers, headcount_growth) and corrected focus_areas to the controlled vocabulary. SOC2/certifications/security page remain unknown (no trust page found).

Related vendors

Sources

www.bespokelabs.ai/ · 2026-06-07, Homepage, positioning, products (Curator, OpenThoughts, Evalchemy, GEPA, TerminalBench), 'Fortune 500 and frontier labs trust us', ICLR 2026 papers
www.bespokelabs.ai/about-us · 2026-06-07, Team/founders, backgrounds, advisors, HQ Mountain View, applied AI research lab mission
www.linkedin.com/company/bespokelabsai · 2026-06-07, Public snippet, ~48 employees, HQ Mountain View, June hiring growth, specialties
tracxn.com/d/companies/bespokelabs/__TgeW4_XxZv-sKUrOh6M6QeTLr6e9xHzW26B · 2026-06-07, Founded 2024, 40 employees as of 2026-04-30, $7.25M raised, Series A label
www.formds.com/issuers/bespokelabs-ai-inc · 2026-06-07, SEC Form D filed 2024-06-04, $7,249,998 raised, directors/execs listed (Dimakis, Sathiamoorthy, Bhaskar Ghosh, Priyank Patel)
luma.com/36sbgxgo · 2026-06-07, Event listing labels round '$7.25M Seed'; CEO ex-Google DeepMind
github.com/bespokelabsai · 2026-06-07, OSS repos, Curator (1.68k stars, Apache-2.0), Verifiers (MIT), SkyRL (Apache-2.0), SkyThought, Sandbox, ProRL-Agent-Server, gepa artifacts
jobs.ashbyhq.com/bespokelabs · 2026-06-07, Careers, open roles incl. RL Environments, Research Engineer, Data Operations Manager, DevOps, recruiter; some remote-US
newsletter.semianalysis.com/p/rl-environments-and-rl-for-science · 2026-06-07, Industry context placing Bespoke Labs among RL environment / data foundry vendors

Last updated 2026-06-07 · Every quantitative field carries a source and a confidence tag. Fields we could not source publicly are marked unknown, never estimated. See the methodology.