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We need to talk about this...Matthew Berman10 Sept 2026
Shown on the METR chart as able to work autonomously for about 16 hours.
Anthropic's Claude Mythos model line, listed alongside Fable as its most capable models for technical work.
Updated EU status checked Last shown
Claude Mythos at a glance
- What is Claude Mythos?
- Claude Mythos is a model from Anthropic. Anthropic's Claude Mythos model line, listed alongside Fable as its most capable models for technical work.
- Who makes Claude Mythos?
- Claude Mythos is made by Anthropic.
- Does Claude Mythos work in the EU?
- Unverified. No explicit evidence found. Last verified 14 Nov 2026.
- How much does Claude Mythos cost?
- Pricing unknown. Licence: Proprietary.
- Where was Claude Mythos shown?
- In 8 creator videos by Matthew Berman, Matt Wolfe. Most recently by Matthew Berman on 10 Sept 2026, at 14:46 in “We need to talk about this...”.
Sources: the vendor's own pages (linked above) and creator videos at the linked timestamps. EU status is information, not legal advice; see how we check.
About
Claude Mythos is a model from Anthropic. The Anthropic homepage currently lists "Claude Fable 5.2 and Mythos 5.2" together as the company's most capable models for daunting technical work, with Fable 5.2 described as setting a new bar in coding, finance, and the sciences. The page gives no separate specifications for Mythos.
A YouTube creator (Matthew Berman) showed Mythos on the METR chart as able to work autonomously for about 16 hours. This is a secondhand characterisation of a time-horizon measurement, and it was not confirmed on the pages provided.
Details on access, pricing, context window, modalities and release date were not available in the material provided. Anthropic models are generally offered through its apps and API, but the specifics for Mythos are not confirmed here.
Key features
- Listed by Anthropic as one of its most capable models (Mythos 5.2)
- Aimed at demanding technical work
- Shown on the METR chart with roughly 16-hour autonomous task horizon (per a creator)
8 moments
As seen on YouTube
Watch the moment: the exact second top creators show it. Videos load only when you press play, via youtube-nocookie.com.
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It Begins: An AI Tried to Escape the LabMatthew Berman22 Jul 2026
Shown on a graph of average steps completed in a 32-step cyber range benchmark, with Mythos preview and the full Mythos model improving over earlier generations, below GPT-5.6 Soul.
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Dario got his way....Matthew Berman26 Jun 2026
Anthropic's model with strong cybersecurity capabilities, shared in April only with select partners instead of the public. The creator cites it as the precedent for staggered releases.
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Why Everyone Is Freaking Out About Fable 5 (Mythos)Matt Wolfe11 Jun 2026
First Mythos-class model, released in April only to a small group of cyber defenders and critical infrastructure providers via Project Glasswing.
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It’s starting…Matthew Berman5 Jun 2026
Unreleased frontier model used internally at Anthropic since Q1. It achieved a 52x speedup on a research-loop test and staff estimated about 4x productivity with it. The creator argues keeping it internal is self-serving.
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Breaking Down the Pope's AI EssayMatthew Berman29 May 2026
Anthropic's next-generation frontier model, strong at cybersecurity, which Anthropic has withheld from general release and made available only to chosen partner companies. The creator cites it as an example of Anthropic gatekeeping.
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Anthropic just dropped Opus 4.8... (WOAH)Matthew Berman29 May 2026
Anthropic says it plans to release a new class of model with higher intelligence than Opus in the coming weeks. It is currently in preview for cybersecurity work under Project Glasswing, pending stronger cyber safeguards.
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We only have 2 years...Matthew Berman15 May 2026
Anthropic's roughly 10 trillion parameter model, strong at finding code vulnerabilities and hacking. It was released only to select partners under Project Glasswing. The creator says critics saw this as fear-based marketing or a sign of limited compute, and notes that a Chinese lab with such a model could use it for cyber offense.
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