Anthropic releases Claude Fable 5, a Mythos-class model the public can finally use, days before a potential record IPO

TL;DR

Anthropic launched Claude Fable 5, its first publicly available Mythos-class model, with safeguards that block high-risk queries and fall back to Opus 4.8.

Anthropic on Tuesday released Claude Fable 5, a model built on the same architecture as its restricted Mythos system, making Mythos-class intelligence publicly available for the first time. Fable 5 is available to enterprise customers and paid subscribers, but it comes with new safeguards that block responses in cybersecurity, biology, chemistry, and what Anthropic calls “distillation” scenarios, falling back to Claude Opus 4.8 to deliver a safe answer instead. Early data from Anthropic indicates the fallback triggers in fewer than 5% of sessions, meaning most users will interact with the full Fable 5 model for the vast majority of their queries.

“For us, it’s really around what we call ‘race to the top,’ being able to provide this technology in a valuable...

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