AIThe Decoder3 days ago
Claude Fable 5: powerful, expensive, heavily filtered
1 min read
Anthropic released Claude Fable 5, the first public Mythos-class model. It tops nearly every benchmark, scoring 64.9 on the Artificial Analysis Intelligence Index and 53 percent on Humanity's Last Exam. Strict guardrails block cybersecurity, biology, chemistry, and model distillation requests. A single test run cost roughly $2,200.
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