Anthropic’s New Claude Is Smarter, Cheaper and Says “No” Less
Imagine asking an AI to help you investigate a complicated problem, write code, analyze research, and keep working for hours without constantly stopping to say it cannot help. That is the direction Anthropic is taking with its newest models. On September 1, Anthropic launched Claude Fable 5.1 and Claude Mythos 5.1, two versions of the same underlying AI model designed for demanding coding, research, and knowledge-work tasks.