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TinkerThinking Machines Lab—Thinking Machines Lab—TinkerThinking Machines Lab—TinkerThinking Machines Lab—

Thinking Machines Lab

Tinker fine-tuning service, AI research

US$12B privateest. 2025thinkingmachines.ai (opens thinkingmachines.ai)Checked 25 Sep

The brief

Analyst view
  • Raised a $2B seed round at a $12B valuation led by Andreessen Horowitz in July 2025, one of the largest ever.
  • Launched Tinker in October 2025 so researchers can customise open models without managing GPUs.
  • Co-founder and CTO Barret Zoph left for OpenAI in January 2026.
Programs

Thinking Machines Lab, one program

Updated 30 Jul 2026
TinkerUsers write their own training code in Python. Thinking Machines runs it on its clusters to cheaply retrain open-weight models.DeployUpdated 30 Jul 2026View program →
Research · Proto · Pilot · Deploy · Scaling

Peers

Frontier models · 5

Company & funding

1 round · as reported
Valuation
$12Bprivate
Raised
$2Bdisclosed private rounds
Last round
SeedJul 2025
HQ
US
Founded
2025
DateRoundAmountPost-moneyLead
Jul 2025Seed$2B$12BAndreessen Horowitz

People

Key people
  • Mira MuratiFounder and CEO
  • John SchulmanCo-founder and Chief Scientist
Primer