2:17 PM ET · Nov 9

Anthropic launches Claude Fable 5.2 and Mythos 5.2

Anthropic released Claude Fable 5.2 and Claude Mythos 5.2, the same underlying model, with Fable carrying cybersecurity and biology safeguards for general availability and Mythos limited to organizations in its Cyber and Life Sciences Verification Programs. The company says the models generate output up to 30% faster than the 5.1 versions and beat Opus 5.5 in coding, reasoning and vision, with pricing cut 20% to $8 per million input tokens and $40 per million output tokens. An optional fast mode runs up to 2.5 times faster at $16/$80. CNBC notes it is Anthropic's first frontier release since CEO Dario Amodei called for slowing AI development, and comes as the company prepares for its IPO.

Source: Anthropic

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Introducing Claude Fable 5.2 and Claude Mythos 5.2, designed to tackle the most daunting technical challenges. They’re capable collaborators on ambitious projects in many fields, and show improvements in areas like coding, reasoning, and vision.
— Claude (@claudeai) Nov 9, 2026

I really love using Fable 5.2. On big, open-ended work it feels like a major step above Opus 5.5. A few tips for getting the most out of it: - Ask what’s wrong with your idea before it builds anything. It’s great at brainstorming and will push back - Start on med/high effort,
— Alex Albert (@alexalbert__) Nov 9, 2026

I had early access to Fable 5.2 for a bit & I think it crosses the line into being a sort of Jagged AGI. Here, I have it launch a business, do academic research, hack hardware, build 3D models & more. I think it is a good illustration of limits & powers:
— Ethan Mollick (@emollick) Nov 9, 2026

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Anthropic launches Claude Fable 5.2 and Mythos 5.2

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