Mythos 5.1

Anthropic released Fable 5.1 and Mythos 5.1 on Tuesday, with the unrestricted Fable version now available on cloud platforms and via the Anthropic API, while Mythos remains limited to registered partn…

Anthropic released Claude Fable 5.1, an upgrade to its most capable AI model, claiming higher performance on coding and problem-solving tasks and up to 45% cost savings for agentic workloads. The comp…

An analysis of the Claude Code 2.1.257 binary reveals a new 'Fable 5.1 prompt bundle' capability assigned to Anthropic's Fable 5.1 and Mythos 5.1 models, which share the same underlying model. The bun…