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AI Safety & AlignmentAI Regulation & PolicyAI Business & IndustrySemafor TechPublished: Sep 11, 2026, 01:00 JST2 min read

Anthropic, OpenAI IPOs face a 10% extinction risk factor

Anthropic, OpenAI IPOs face a 10% extinction risk factor

3 Key Points

  1. What happened

    An Anthropic researcher resigned, saying frontier labs are "gambling with our lives," and a colleague put AI-driven human extinction odds at more than 10%.

  2. Why it matters

    Anthropic's listing lawyers at Wilson Sonsini, and OpenAI's at Cooley and Wachtell, now face writing that risk into offering documents — a section Semafor calls "a doozy."

  3. What to watch

    The test is how those lawyers phrase an existential risk in a prospectus, where vague warnings can still draw liability. Watch Semafor's own attempt at the wording.

WHO IT HITSThe lawyers drafting Anthropic's and OpenAI's IPO offering documents — at Wilson Sonsini, Cooley and Wachtell — are the ones who must now put this risk into writing. Investors reading those prospectuses would be the ones weighing it.

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Context & Analysis

The debate over existential AI risk usually stays in research labs and think pieces. This week it moved into the open, and Semafor frames the timing as awkward: it lands while Anthropic and OpenAI are preparing to go public.

What makes it a business story is the paperwork. A public listing requires an offering document that lists the risks a company faces, and the article notes that "we might cause the end of civilization" is an unusual one to draft. Semafor points to the specific lawyers in the middle of it — Wilson Sonsini for Anthropic, and Cooley and Wachtell for OpenAI — and says it tried its own hand at the wording.

How this turns out likely hinges on how those firms judge the line between a risk they must disclose and one so broad it becomes meaningless in a prospectus. Sentences that are too vague could invite legal trouble; sentences that are too specific could be read as an admission. Semafor's own exercise suggests the answer is not obvious, and the firms have not said how they will handle it.

FAQ
What did the Anthropic researcher say when he quit?
He warned that frontier labs are "gambling with our lives." A colleague then put the odds of human extinction from AI at more than 10%.
Which law firms are working on the Anthropic and OpenAI IPOs?
Wilson Sonsini is working on the Anthropic listing, and Cooley and Wachtell on OpenAI's, per Semafor.
Why does AI extinction risk matter for the IPOs?
Semafor notes that "we might cause the end of civilization" is a serious risk factor, raising the question of how it gets written into the offering documents.

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