Thinking Machines Lab logoFunding timeline

Thinking Machines Lab

Thinking Machines Lab is Mira Murati's San Francisco lab for 'collaborative general intelligence,' founded in 2025 after she stepped down as OpenAI's CTO. It has shipped the Inkling open-weight model family.

Thinking Machines Lab logo
Founded
Feb 2025
Headquarters
San Francisco, CA
Founder / CEO
Mira Murati (former OpenAI CTO)
Key people
John Schulman (Chief Scientist, OpenAI co-founder); Soumith Chintala (CTO, from 2026)
Sector
Frontier AI research — collaborative general intelligence, open-weight models
Products
Tinker (agent platform, 2025); Inkling & Inkling-Small (open-weight LLMs, Jul 2026)
Latest valuation
US$12B (Seed)
Team
~100 employees (2026)
Rounds recorded
1
Total raised
$2B

Funding Timeline

Every disclosed equity round for Thinking Machines Lab, newest to oldest, with lead and participating investors where reported. Data is stored oldest-first; the timeline is displayed latest-first.

  1. Jul 15, 2025

    Seed

    $2Bat $12B valuationLatest
    Led by Andreessen HorowitzNVIDIAAMDAccelServiceNowCiscoJane StreetGovernment of Albania

    The largest first round in venture history at the time — roughly 4× any previous seed — raised by a company under a year old with no disclosed product. Albania's government participated (~US$10M, ~0.08% at the $12B valuation) alongside a Silicon Valley syndicate.

    Source ↗

The Story Behind the Numbers

OpenAI's CTO Goes Her Own Way

Mira Murati left OpenAI in late 2024 after more than six years, rising from VP of Applied AI to CTO, and founded Thinking Machines Lab in February 2025. She recruited John Schulman, an OpenAI co-founder who had briefly moved to Anthropic, as chief scientist; Barret Zoph (OpenAI VP of research) as CTO; plus Lilian Weng, Luke Metz and Andrew Tulloch. Launch coverage described a deliberate alternative to closed labs: systems built around natural collaboration with people, with research shared openly.

The Largest Seed Round in History

In July 2025, just five months after founding and with no public product, Thinking Machines closed a US$2B seed led by Andreessen Horowitz at a US$12B post-money valuation — the largest first round ever recorded and about 4× any previous seed. NVIDIA, AMD, Cisco, ServiceNow, Accel and Jane Street joined; Albania's government invested ~US$10M, requiring a budget amendment. Investors were betting on team pedigree and an OpenAI-shaped roadmap rather than shipped software. A planned follow-on at a US$50B valuation collapsed in January 2026 amid leadership turmoil — the NYT reported co-founders pressing for a sale or merger before departing — and valuation expectations reset toward ~US$12B.

Products: Tinker and Inkling

The lab exited research mode in stages: Tinker, an agentic product line, arrived in late 2025, and in July 2026 the company released Inkling, an open-weight frontier model family (975B-parameter and 41B variants), positioning Thinking Machines among the few labs shipping open weights at scale. Product momentum matters because the failed US$50B round left the company reliant on operational revenue and a fresh negotiation at a lower step-up.

The Road Back to the Cap Table

By January 2026 the NYT reported deep internal conflict: co-founders unhappy with direction and release pace, talks with Meta and Anthropic explored, and a wave of departures including CTO Barret Zoph (later replaced by Soumith Chintala). As of September 2026 the lab is reported negotiating a US$5–6B round at a ≥US$40B pre-money valuation with Accel expected to lead and NVIDIA considering ~US$2.5B — not yet closed. The outcome will test whether the market still prices OpenAI-exodus pedigree at frontier-lab multiples.

More in the Atlas

Thinking Machines Lab's lead investors are profiled in the Investor Atlas when their firms join the directory. Track who backs every frontier AI round on the Funding Leaderboard.

Frequently asked questions

Why is Thinking Machines' US$2B seed the largest first round in venture history?

Because it priced pedigree before product: US$2B at a US$12B post-money — roughly 4x any previous seed — for a five-month-old lab with nothing shipped, built around Mira Murati, John Schulman and other OpenAI alumni. The January 2026 collapse of the US$50B follow-on is the control experiment: when cohesion wobbled, expectations reset toward US$12B, showing how much of the price was the people.

What is a national government doing on a seed cap table?

Flying a flag: Albania invested ~US$10M — about 0.08% at the US$12B valuation — a stake small enough to require a budget amendment in Tirana. It previews the sovereign-money pattern across the set: the UK's Sovereign AI Fund in Ineffable's seed, Temasek in AMI Labs', Saudi HUMAIN's US$3B in xAI's Series E — states buying frontier-lab exposure as policy, at symbolically sized tickets.

Why did the planned US$50B follow-on collapse?

Because the product lagged the price: by January 2026 the NYT reported co-founders pressing for a sale or merger over direction and release pace, followed by departures including CTO Barret Zoph. Expectations reset toward ~US$12B — a year of churn without a step-up. The counter-move is Inkling, the July 2026 open-weight family (975B and 41B parameters), shipped ahead of the reported US$5–6B raise.

How does Thinking Machines differ from Sutskever's SSI, given both are ex-OpenAI bets?

Opposite structures: SSI's charter bans commercialization outright, while Thinking Machines shipped Tinker in late 2025 and the open-weight Inkling family by July 2026, leaning on operational revenue after the US$50B round fell apart. SSI's US$32B came with no product plan; TML's US$12B seed demands one — the pending round will price whether OpenAI pedigree alone still clears frontier multiples.

Why does the seed syndicate read like a hardware coalition?

Because chipmakers seed future GPU buyers: NVIDIA, AMD, Cisco and ServiceNow joined a16z and Jane Street — the same strategic pattern as SSI's round and AMI Labs' five-co-lead group. The hedge cuts both ways: after the US$50B collapse, NVIDIA's reported ~US$2.5B consideration in the pending round shows hardware capital keeping its option open on a lab whose first seed it already priced.