DECRYPT · 2026-11-09 22:36 UTC

Anthropic's Claude Fable 5.2 and Mythos 5.0 Are Impressive, But Be Prepared to Sell a Kidney to Afford Them

Anthropic released Claude Fable 5.2 and Mythos 5.2, which can turn instructions into working software, design physical objects, and tackle research problems. Users report multi-day autonomous builds: one Gears of War-style level took 43 hours 48 minutes and an estimated $14,710 in API costs, and a browser-based Excel clone cost about $11,700. Standard API pricing is $8 per million input tokens and $40 per million output tokens, down from $10 and $50; fast mode doubles the rates, and Anthropic says Fable 5.2 scored 49.1% on FrontierCode 2.0 versus 32.4% for Fable 5.1.

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