What is Claude Mythos and why did Anthropic not release it?

Claude Mythos Preview is Anthropic's most powerful AI model, announced on April 7, 2026. Anthropic withheld its full public release because internal and third-party testing showed the model poses serious cybersecurity risks. It can analyze software systems, find vulnerabilities, string them together, and evade sophisticated defenses. It found critical faults in every widely used operating system and web browser, with 99% of those vulnerabilities unpatched at the time of discovery.

What is Project Glasswing?

Project Glasswing is Anthropic's controlled cybersecurity initiative announced alongside the Mythos Preview. It pairs the model with a coalition of twelve major technology and finance companies to find and patch software vulnerabilities across critical infrastructure before adversaries can exploit them. Launch partners include Amazon Web Services, Apple, Broadcom, Cisco, CrowdStrike, Google, JPMorganChase, the Linux Foundation, Microsoft, Nvidia, and Palo Alto Networks. Anthropic committed up to $100 million in usage credits and $4 million in direct donations to open-source security organizations.

Is Anthropic going public with an IPO?

Anthropic is reportedly evaluating an IPO as early as October 2026. The company's annualized revenue run rate surpassed $30 billion as of April 2026, up from approximately $9 billion at the end of 2025. The number of business customers each spending over $1 million annually now exceeds 1,000, doubling in less than two months.

What is the US government's position on Claude Mythos?

Anthropic is in active discussions with the US government over Mythos. Treasury Secretary Scott Bessent convened a meeting of senior American bankers in Washington to discuss the model, and Goldman Sachs, Citigroup, Bank of America, and Morgan Stanley are reportedly testing it. However, Defense Secretary Pete Hegseth declared Anthropic a 'supply chain risk to national security' in late February 2026, though a federal judge issued a preliminary injunction against that designation, which the Trump administration is appealing.

AI & Emerging Technologies 21 APR 2026

Mythos, The AI Model Too Dangerous to Release

Q: How capable is Claude Mythos at hacking?

An assessment by the UK's AI Security Institute (AISI), which was granted early access, found Claude Mythos succeeded at expert-level hacking tasks 73% of the time. Prior to April 2025, no AI model could complete those tasks at all. Mythos also found critical vulnerabilities in every major operating system and web browser, with 99% of those vulnerabilities previously undiscovered, some having existed for decades.

Anthropic Withholds Its Most Powerful Model

Anthropic announced on April 7, 2026 that it would withhold the full release of its new AI model, Claude Mythos Preview, because it believes the model is too dangerous for the public at this stage. Not since OpenAI temporarily withheld its GPT-2 model in 2019 has a major AI developer deemed a system too dangerous for public release.

Abstract visualization of Claude Mythos, Anthropic's AI model withheld from public release due to its advanced hacking and cybersecurity capabilities

What Makes Claude Mythos So Dangerous

Mythos is not just able to write code that can hack into critical systems. It can also analyze systems, find vulnerabilities, and string them together, allowing it to evade even sophisticated defenses.

Key capability findings In tests, Mythos found critical faults in every widely used operating system and web browser. Of those vulnerabilities, 99% had not yet been patched, and some had been undiscovered for decades. An assessment by the UK's AI Security Institute (AISI) found the model succeeded at expert-level hacking tasks 73% of the time. Prior to April 2025, no AI model could complete those tasks at all. Mythos also scored 31 percentage points higher than Claude Opus 4.6 on the USAMO 2026 Mathematical Olympiad.

Chart comparing AI model token usage and capability scores in 2026, showing Claude Mythos significantly ahead of previous models

Project Glasswing: The Controlled Rollout

Anthropic announced Project Glasswing, a sweeping cybersecurity initiative that pairs Mythos Preview with a coalition of twelve major technology and finance companies in an effort to find and patch software vulnerabilities across the world's most critical infrastructure before adversaries can exploit them. Anthropic committed up to $100 million in usage credits and $4 million in direct donations to open-source security organizations.

Launch partners:

Amazon Web Services

Apple

Broadcom

Cisco

CrowdStrike

Google

JPMorganChase

Linux Foundation

Microsoft

Nvidia

Palo Alto Networks

Government Involvement and Political Tension

Anthropic is in active discussions with the US government over Mythos, and Treasury Secretary Scott Bessent convened a meeting of senior American bankers in Washington to discuss the model. Goldman Sachs, Citigroup, Bank of America, and Morgan Stanley are reportedly testing it as well.

This comes amid significant political tension. Defense Secretary Pete Hegseth declared Anthropic a "supply chain risk to national security" in late February 2026, though a federal judge issued a preliminary injunction against that designation, which the Trump administration is appealing.

Chart showing Anthropic revenue growth and projected trajectory toward IPO in 2026

The Cybersecurity Community Is Split

The cybersecurity community is divided on the significance of Mythos. Peter Swire, a professor at Georgia Tech's School of Cybersecurity and Privacy and former advisor to the Clinton and Obama administrations, noted that "a large fraction of the cybersecurity professors believe this is pretty much what was expected, and pretty much more of the same." Ciaran Martin, former CEO of the UK's National Cyber Security Centre, said it is "a big deal, but unlikely to prove to be the end of the world."

Anthropic's Financial Momentum and IPO Plans

Anthropic by the numbers — April 2026 Annualized revenue run rate surpassed $30 billion, up from approximately $9 billion at the end of 2025. Business customers each spending over $1 million annually now exceeds 1,000, doubling in less than two months. The company is evaluating an IPO as early as October 2026.

A Narrow Window Before Capabilities Proliferate

The core tension is timing. As Anthropic's own team acknowledged, "frontier AI capabilities are likely to advance substantially over just the next few months," meaning the window to patch vulnerabilities before bad actors develop comparable tools may be narrow. Project Glasswing is Anthropic's bet that a controlled, partnership-driven deployment can use Mythos's capabilities to close that window faster than adversaries can open it.

Kai Tutor | The Societal News Team

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