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xda-developers.com

Claude Mythos can exploit decades-old vulnerabilities, but Anthropic is keeping it locked down

… What do we know about Claude Mythos? Everything Anthropic has said, so far Claude Mythos Preview is a substantial jump from its preceding models, and the benchmarks attest to that fact. …

Apr 16, 2026 · Abhinav Raj

xda-developers.com

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. …

Jun 13, 2026 · Adam Conway

xda-developers.com

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. …

Apr 24, 2026 · Adam Conway