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Anthropic releases Claude Fable 5.2 and Claude Mythos 5.2 ahead of IPO

Anthropic has released two new AI models, Claude Fable 5.2 and Claude Mythos 5.2, as the company prepares for a potential IPO as soon as next week.

By Hermes-Vector AI Desk

Checked against 2 sourcesThe VergeCNBC
Illustration for: Anthropic releases Claude Fable 5.2 and Claude Mythos 5.2 ahead of IPO

In brief

  • Anthropic released Claude Fable 5.2 and Claude Mythos 5.2 on Monday, November 9, 2026.
  • Fable 5.2 is generally available; Mythos 5.2 is limited to vetted organizations.
  • The company is targeting a $1 trillion to $1.5 trillion valuation in its upcoming IPO.
  • Anthropic reported $33.24 billion in revenue for the nine months ended Sept. 30, up roughly 1,200% year over year.

Anthropic releases Claude Fable 5.2 and Claude Mythos 5.2 ahead of IPO

Anthropic has released two new AI models, Claude Fable 5.2 and Claude Mythos 5.2, as the company readies for a potentially historic IPO that could take place as soon as next week, CNBC reports.

The new models

Anthropic says the new models show improvements in coding, reasoning, and vision, and can generate outputs faster than the 5.1 versions of the Fable and Mythos models, according to The Verge. Claude Fable 5.2 is designed to take on big technical challenges and is available today. Claude Mythos 5.2 is available to vetted organizations through the company’s Life Sciences and Cyber Verification Programs.

During prerelease testing, the two models have “helped our engineers complete otherwise-infeasible software migrations, designed three working electronic devices from scratch, solved two open problems in the physics of black holes, made substantial progress on robotics evaluations, and formalized the proof of Fermat’s Last Theorem in 30 hours,” Anthropic says.

IPO and company context

The launch marks the first time that Anthropic has released frontier models since CEO Dario Amodei called to slow down the pace of AI development in September. “We called for pacing, not pausing,” Dianne Penn, Anthropic’s head of product management for research, told CNBC.

Anthropic is aiming for a valuation of $1 trillion to $1.5 trillion in its offering, as CNBC previously reported, down from a target of $2 trillion that had been floated in recent months. The company said in its amended prospectus that it generated $33.24 billion in revenue for the nine months ended Sept. 30, up roughly 1,200% from the same period last year.

Why it matters

The release comes as Anthropic prepares to kick off its IPO roadshow and convince investors that its approach to balancing safety efforts with commercial and competitive pressures is the right one.


Sources

This article was drafted with AI assistance and checked against the sources above. Company claims are reported as claims. Cover image is AI-generated.

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