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

Anthropic released Fable 5.1 and Mythos 5.1, with Fable 5.1 cutting token costs by 25% and up to 45% for agentic tasks, while Mythos 5.1 offers stronger performance and fewer false-positive safety restrictions, addressing customer complaints about pricing and overzealous safeguards.

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. Topics Sources - Press Read article https://techcrunch.com/2026/09/01/anthropics-new-fable-release-is-cheaper-less-restrictive/ - Press Read article https://www.theverge.com/ai-artificial-intelligence/987830/anthropic-claude-fable-mythos-5-1 Go deeper This intelligence is sourced automatically from public sources across the web and synthesised by the Prefactor AI pipeline. Stories are reviewed before publication.