Sep. 1 at 6:36 PM
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Anthropic introduces Claude Fable 5.1, Claude Mythos 5.1
Anthropic is introducing Claude Fable 5.1 and Claude Mythos 5.1, calling them "the world's most advanced models for coding and knowledge work-and their research capabilities offer an early glimpse of how AI models will contribute to scientific progress." According to the company, "Claude Fable 5.1 and Claude Mythos 5.1 are the same model, but with different levels of safeguards. Fable 5.1 is generally available, while Mythos 5.1 is available only through our trusted access programs; its safeguards are specifically designed to support work in cybersecurity and the life sciences. Fable 5.1 will cost an estimated 25% less than Fable 5 for typical workloads, wherever usage is billed by token...
We've improved our safeguards to reduce false positives... In cybersecurity, our newest safeguards block 60% fewer false positives than before. In part, this is because Fable 5.1 can now be used to discover software vulnerabilities-though not develop exploits for them. In biology, we've established an access program, developed in partnership with the US government, to enable access to Claude Mythos 5.1's advanced biology capabilities. We expect to open enrollment for scientists soon... Claude Fable 5.1 is available today on all platforms, including Amazon Web Services (AMZN), Google Cloud (GOOGL), and Microsoft Azure (MSFT). Developers can get started with claude-fable-5-1 on the Claude API."
