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Mahesh Sathiamoorthy Is Building the Practice Worlds AI Agents Need
After a decade improving the systems behind YouTube recommendations, Mahesh Sathiamoorthy left Google DeepMind to work on a new bottleneck: the data, tests and realistic environments that teach AI agents how to finish the job.
Bespoke Labs
Bespoke Labs is a Mountain View AI research lab that builds tools and datasets for training more reliable AI models and agents, starting with synthetic data curation and hallucination detection and expanding into realistic reinforcement-learning environments for long-horizon agentic AI. Its open-source projects, including Bespoke Curator, Bespoke-MiniCheck, OpenThoughts, Terminal-Bench, and GEPA, are widely used across the AI research community, and the company raised $40M in seed and Series A funding by mid-2026 from investors including Wing Venture Capital, 8VC, and Mayfield.