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A hands-on take on Claude Fable 5: at the same effort level it's faster than Opus 4.8 with noticeably better code quality — but roughly a third of security audits get blocked by its widened cyber classifier and rerouted to Opus 4.8.
US export controls on Claude Fable 5 and Mythos 5 have been lifted; Fable 5 returns July 1 with a tighter cyber classifier (more false positives, Opus 4.8 fallback), a new industry jailbreak-severity framework, and deeper US government collaboration.
Anthropic's new Mythos-class model, Claude Fable 5, is its strongest coding and agentic model yet — cheaper than the preview, with a new safeguard layer that can fall back to Opus 4.8.