AI Matters
Why it matters
Anthropic releases cheaper and faster Claude Fable 5.1 model
The Decoder Anthropic's Claude Fable 5.1 promises better coding and research at up to 45 percent less
Anthropic launched Claude Fable 5.1 and Mythos 5.1, offering improved coding performance and up to 45% lower costs for long-running autonomous tasks.
Why it matters
Developers and businesses can run complex coding and research tasks with a 45% reduction in costs and significantly fewer false-positive safety blocks.
Latest brief · Sep 2, 2026