Thirteen researchers left frontier labs for stealth startups, but only four are strongly corroborated

As of 2026-09-10 · evidence-based public-web scan

Asked:

“Which AI researchers have recently left frontier labs to start their own companies that are still in stealth mode?”

Counting departures in 2025–2026 from OpenAI, Google DeepMind, Meta, Anthropic and xAI, a public-web scan yields 13 credible stealth founders. Four are corroborated across many independent news domains, one rests on a single news source, and eight are self-reported LinkedIn profiles only. Publicly launched ventures (Jeff Dean's Discovery Loop, Pete Florence's Generalist AI, David Silver's Ineffable Intelligence), non-research executives, and a role that ended in March 2026 were excluded.

Evidence strength by candidate

Bar length = independent news hosts reporting the departure and stealth venture (log scale). Colour = evidence tier. Hover a bar for detail.

Danijar Hafner is the freshest well-corroborated case: he left Google DeepMind in October 2025 for a stealth robotics / world-model startup, with reporting as recent as 2026-09-09 across 10 independent hosts. aichatdaily.com

Miles Wang (ex-OpenAI, AI drug discovery, reportedly in talks to launch) and Andrew Ho (ex-OpenAI, selling reinforcement-learning data to labs) are the most widely covered, at 63 and 32 independent hosts. aiweekly.co

Jiahui Yu left Meta on 2026-08-14 for a still-undisclosed company aimed at “a problem that will profoundly shape humanity's future”, corroborated by 11 hosts. finance.biggo.com

Thore Graepel, AlphaGo co-creator, left DeepMind in September 2026 to bet on structured search over LLM scaling — plausible, but resting on one news source so far. techtimes.com

All 13 candidates

Researcher	Evidence	Former lab · title	Left	Focus	Company / status	Hosts	Source

Method: evidence-based public-web scan as of 2026-09-10, not a complete census — stealth companies are intrinsically hard to enumerate. 13 candidates from a cross-source table of 18 rows (one per researcher/lab/company) plus 11 self-reported LinkedIn profiles; "hosts" counts distinct news or profile domains per candidate. Departures limited to 2025–2026; launched companies, non-research executives, ended stealth roles, and duplicate former-lab entries (Vincent Alessi is counted once, via his March 2026 Anthropic departure) were excluded. All company names are blank in the evidence: unnamed/undisclosed is the finding, not missing data.

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