# Thinking Machines Lab Raises $5B at $40B Valuation

> AI startup Thinking Machines Lab nears $5 billion funding round led by Accel.
- Title: Thinking Machines Lab Raises $5B at $40B Valuation · Dealroom
- Summary: AI startup Thinking Machines Lab nears $5 billion funding round led by Accel. Thinking Machines Lab, an AI startup founded by former OpenAI chief technology…
- Keywords: thinking machines lab, accel, mira murati, openai, ai startup, funding round, pre-money valuation, tinker, Dealroom
- Source: Dealroom — https://dealroom.co/news/170334-thinking-machines-lab-nears-5b-round-at-40b-valuation-led-by-accel
- Published: 2026-11-06T12:56:00+00:00
- Read time: 1 min
- Topics: thinking machines lab, accel, mira murati, openai, ai startup, funding round, pre-money valuation, tinker, startups, business
## What's the deal?
Thinking Machines Lab, the San Francisco AI startup founded by former OpenAI chief technology officer Mira Murati, is reportedly raising $5 billion at a $40 billion pre-money valuation.
## Why now?
The raise more than triples the $12 billion valuation from the company's $2 billion seed in July 2025 after co-founders left for rivals like Meta and OpenAI.
## What's the endgame?
The company sells Tinker, a system for fine-tuning large language models on their own data, with Inkling and a new version of Tinker released in July and November.
## Key takeaway

Thinking Machines Lab, an AI startup founded by former OpenAI chief technology officer Mira Murati, is raising $5 billion at a $40 billion pre-money valuation, led by investment firm Accel.