Why Anthropic's 'safe' Mythos-class model won't answer questions about cancer

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Anthropic released Claude Fable 5 on June 9, 2026, marking the first public Mythos-class model. Available via API, it costs 10 dollars per million input tokens and 50 for output. While SWE-Bench Pro scores reach 80.3 percent, broad safeguards block certain cybersecurity and biology requests, redirecting them to Opus 4.8. Stripe utilized the model for a 50-million-line migration in one day. Claude Mythos 5 remains restricted to a specific partner circle.
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