India, Sept. 2 -- Anthropic announced Claude Fable 5.1 and Claude Mythos 5.1 in September 2026, bringing an upgraded generation of its most capable AI models. The company says Fable 5.1 is designed for demanding coding, knowledge work, and long-running problem-solving tasks.

According to Anthropic, Claude Fable 5.1 can deliver stronger results than Fable 5 while also reducing costs for many workloads. The company has also introduced Mythos 5.1 for users who have access through its trusted programs.

What is Claude Fable 5.1?

Claude Fable 5.1 is Anthropic's latest upgrade to its Fable family of AI models. Anthropic describes it as one of its most advanced models for coding and knowledge work.

The model is built to handle complex tasks t...