Mythos Preview Daily

Independent coverage of Anthropic's most powerful AI model.

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Announcement

Anthropic Announces Claude Mythos Preview — Its Most Powerful AI Model Yet

Anthropic officially unveils Claude Mythos Preview and Project Glasswing, marking a new chapter in AI capability and controlled deployment.

Apr 7, 20267 min read

Latest Coverage

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Cybersecurity

Unauthorized Access to Mythos Preview: What We Know So Far

Reports indicate unauthorized users accessed Claude Mythos Preview through a third-party contractor. Anthropic confirms investigation is underway.

Apr 22, 20265 min read
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Policy

NSA Uses Mythos Preview as Pentagon Labels Anthropic a 'Supply-Chain Risk'

The U.S. government's contradictory relationship with Claude Mythos Preview exposes deep tensions around AI-powered cybersecurity.

Apr 15, 20267 min read
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Deep Dive

Claude Mythos Preview System Card: What It Reveals About the Model's Capabilities

An in-depth analysis of the Mythos Preview system card — from zero-day discovery at scale to autonomous exploit development.

Apr 10, 202610 min read
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Benchmarks

Claude Mythos Preview Benchmark Breakdown: How It Compares to GPT-5 and Opus 4.6

A detailed breakdown of Claude Mythos Preview's performance across SWE-bench, Cybench, USAMO 2026, and other key benchmarks.

Apr 9, 20268 min read
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Partnerships

Project Glasswing Explained: Anthropic's Controlled AI Security Initiative

A detailed look at Project Glasswing — who the 12 founding partners are, how access works, and what it means for AI-driven cybersecurity.

Apr 8, 20268 min read
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Cybersecurity

The Capybara Leak: How Internal Anthropic Documents Exposed Mythos Preview

A CMS misconfiguration in March 2026 exposed 3,000 internal Anthropic documents revealing the existence of Claude Mythos Preview.

Apr 5, 20266 min read

What is Claude Mythos Preview?

Claude Mythos Preview is an unreleased frontier AI model from Anthropic, announced April 7, 2026. It is not publicly available. Access is limited to 12 founding partners through Project Glasswing for defensive cybersecurity purposes.