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Claude Opus 4.8

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2 articles First covered Jun 9, 2026, latest Jun 9, 2026
Anthropic's announcement artwork for Claude Fable 5 and Claude Mythos 5, a soft gradient panel with the Claude wordmark.
AI·

Claude Fable 5 is Anthropic's first public Mythos-class model. It tops SWE-Bench Pro at 80.3%.

Claude Fable 5 hits 80.3% on SWE-Bench Pro and ships on Bedrock and Copilot at $10/$50 per million tokens, free on paid plans only through June 22.

A hand holds a smartphone showing the Claude Mythos app logo against a dark backdrop with Anthropic's orange burst symbol.
Policy·

Anthropic is sending Mythos 5, the model it called too dangerous, to cyberdefenders and the US government

Mythos 5 is the same model as Fable 5 with cyber safeguards lifted, going to Project Glasswing defenders and, Anthropic says, ~150 orgs across 15+ countries.