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Model releaseFrontierInternationalConfirmed

Anthropic releases Claude Fable 5.2 and Mythos 5.2

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Source: Anthropic

Anthropic released Claude Fable 5.2 and Claude Mythos 5.2, upgrades of its two models for the most demanding technical work, which it says are the same underlying model. Testers found they generate outputs up to 30% faster than Fable 5.1 and Mythos 5.1, at $8 per million input tokens and $40 per million output tokens, with an optional fast mode at $16 and $80. Fable has cyber and biology safeguards and is available to all users, while Mythos access goes through the Life Sciences and Cyber Verification Programs.

Why it matters

Developers pay $8 per million input tokens and $40 per million output tokens for Fable 5.2, and cybersecurity or biomedical research groups can apply for Mythos 5.2 access.

When
9 Nov 2026
ID
WTA-N-2026-0791
Who
Anthropic

Summary written with AI by wheresthe.ai, from Anthropic. Checked against the source on 10 Nov 2026.

Read the original at Anthropic

Source copy: saved on 10 Nov 2026 to check this story and not republished, because the text belongs to its publisher. Also held by the Internet Archive.

Next stop on this Storyline: What happened nextFortinet patches nearly 100 vulnerabilities in 89 advisories

Cite this story

WTA-N-2026-0791: “Anthropic releases Claude Fable 5.2 and Mythos 5.2.” wheresthe.ai, 9 Nov 2026. https://wheresthe.ai/d/intl-anthropic-releases-claude-fable-5-2-and-mythos-5-2-2026-11/ (source: Anthropic).

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