Claude Mythos: The AI Model Anthropic Built But WON’T Sell You

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Anthropic finished training their most powerful model ever — and then refused to ship it. It’s called Claude Mythos, and it’s been sitting above the entire Opus line this whole time. Here’s everything we know.

Anthropic has quietly confirmed a model that sits above Claude Opus 4.6, 4.7, and 4.8 — internally codenamed Mythos (and "Capybara"). It’s not Opus 5. Anthropic describes it as a new tier entirely: larger, more intelligent, and locked behind a private cybersecurity program called Project Glasswing.
In this breakdown I cover what Claude Mythos actually is, the leaked benchmark numbers (93.9% on SWE-bench Verified vs Opus 4.6’s 80.8%), how it autonomously chained exploits and rediscovered a 27-year-old OpenBSD bug, how it stacks up against GPT-5 and Gemini Ultra, what it costs ($25/$125 per million tokens), why you can’t access it, and what it means for coding, knowledge work, and education even if you never touch the API.
A finished frontier model that’s too dangerous to release. Either the biggest vibe shift in AI safety culture — or the most expensive marketing move in the industry. Let’s get into it.

⏱️ Chapters below 👇
00:00 — The model Anthropic won’t sell you
00:40 — What Claude Mythos Actually Is
01:38 — How We Got Here: The Timeline
02:43 — What Mythos Can Actually Do
06:30 — How It Stacks Up Against GPT and Gemini
08:43 — Release, Access & Why You Can’t Have It
10:09 — What Mythos Means For You, Even If You Can’t Use It
12:11 — The Risks: Why Anthropic Is Scared of Their Own Model

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