Anthropoic released Claude Fable 5 – A Mythos Class Model. It is a step up in many ways. It seens to be stepping up innovative science improvement.
It still feels like very solid incremental improvements but not breaking away yet. But feeling like we are getting closer.
It is expensive to run it.
Introducing Claude Fable 5: a Mythos-class model that we’ve made safe for general use.
Its capabilities exceed those of any model we’ve ever made generally available. pic.twitter.com/2AvmEjHIX8
— Claude (@claudeai) June 9, 2026
Claude 5 Fable ranking 1st on AAI pic.twitter.com/eLGHdeEOos
— Lisan al Gaib (@scaling01) June 9, 2026
This is a super exciting release – Claude Fable 5 is the same underlying model as Mythos but with added safeguards. The benchmarks are great and it’s SOTA on everything by a margin but I’ll add that *qualitatively* also, this is a major-version-bump-deserving step change forward… https://t.co/DljsNnY1Yf
— Andrej Karpathy (@karpathy) June 9, 2026
Brian Wang is a Futurist Thought Leader and a popular Science blogger with 1 million readers per month. His blog Nextbigfuture.com is ranked #1 Science News Blog. It covers many disruptive technology and trends including Space, Robotics, Artificial Intelligence, Medicine, Anti-aging Biotechnology, and Nanotechnology.
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