Anthropic has launched Claude Fable 5.1 and Mythos 5.1!
These next-gen "Mythos-class" frontier models feature a 1-million-token context window and massive performance leaps, with Fable 5.1 more than doubling its predecessor's science benchmark scores. Fable 5.1 is available to everyone today via Claude.ai and Claude Code with dramatically fewer false safety blocks, while Mythos 5.1 is a restricted version with relaxed guardrails for vetted US cybersecurity and life sciences researchers. While base pricing remains $10/$50 per million tokens, a massive 75% price cut to prompt caching makes running autonomous agents up to 45% cheaper.
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