MarkTechPost - 2026-09-01 ​
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1. Anthropic Releases Claude Fable 5.1 and Claude Mythos 5.1: 52.6% on Terminal-Bench-Science and 75% Cheaper Cache Reads ​
Author: Asif Razzaq
Published: 9/1/2026, 8:30:21 PM
Categories: Agentic AI, AI Agents, AI Shorts, Applications, Artificial Intelligence, Editors Pick, Generative AI, Language Model, New Releases, Staff, Tech News, Technology
Anthropic has released Claude Fable 5.1 and Claude Mythos 5.1, the same model behind two different safeguard layers. Fable 5.1 is generally available on the Claude API, AWS, Google Cloud, and Microsoft Foundry; Mythos 5.1 remains restricted to vetted organizations under Project Glasswing. Fable 5.1 ...