AWS announces Claude Fable 5, the first generally available Mythos-class model
Today’s signal AWS What’s New recently reported AWS announces Claude Fable 5, the first generally available Mythos-class model. Published context: June 9, 2026. Claude Fable 5 is generally available on AWS and makes Mythos-level capabilities available to all customers, with strong safeguards designed to make it safe for broader use. Fable 5 is state-of-the-art on nearly all tested benchmarks and delivers a step-change in autonomous knowledge work and coding for developers and enterprises building production AI appli ...