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AI fine-tuning infrastructure founded by former OpenAI CTO Mira Murati
HQ: San Francisco, CA | Founded: 2024 | Employees: 50-100 | Stage: Seed / Early Growth | Website: https://thinkingmachines.ai
Thinking Machines Lab is an AI infrastructure company founded in 2024 by Mira Murati, former CTO of OpenAI, along with co-founders Barret Zoph and John Schulman. The company develops tools and cloud infrastructure for fine-tuning and adapting large language models. Its primary product, Tinker, launched in 2025, provides a managed platform for researchers and enterprises to customize models for domain-specific applications. The company raised $2 billion in seed funding in mid-2025 at a $10 billion valuation, led by Andreessen Horowitz, and was in talks for a subsequent round at approximately $50 billion by late 2025. In March 2026, Nvidia announced a new investment in the company alongside a chip supply partnership.
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