Artificial intelligence company Anthropic announced the launch of Claude Fable 5.1 and Claude Mythos 5.1, describing them as the world's most advanced models for coding and knowledge work.
According to Anthropic, both offerings represent the same underlying model architecture but feature different tiers of operational safeguards. The company stated that Claude Fable 5.1 is generally available to users, whereas Claude Mythos 5.1 is restricted to trusted access programs with protections configured specifically for cybersecurity and life sciences research.
