Anthropic releases Fable 5.1 and Mythos 5.1 with reduced token costs and fewer safety false positives

According to TechCrunch, Anthropic released Fable 5.1 with 25% lower token costs and up to 45% reduction for agentic tasks, and Mythos 5.1 with stronger performance and fewer false-positive safety restrictions. The releases address customer complaints about pricing and overzealous safeguards in prior versions.