Claude Fable 5 caught bugs GPT-5.5 and Opus 4.8 missed, then the US government forced it offline
… Claude Fable 5 was the first Mythos-class model available to anyone with a Claude subscription, and it was the same underlying model as Mythos 5. …
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Claude Mythos
Claude, ChatGPT, and Gemini get all the hype, but the most interesting AI models are coming from elsewhere
… The best open models are topping the charts when it comes to coding if we remove Claude's Mythos from the mix, anyway , and, technically, anyone can just download them and use them. …
Cal.com just went closed source over AI, but AI is exactly why open source still wins
… A 27-year-old denial-of-service bug in its TCP stack, found autonomously during Anthropic's scaffolded Mythos testing, isn't a small finding. …