Anthropic Names New AI Model ‘Mythos’ After Greek Word

The Claude by Anthropic. Credit: Greek Reporter Archive

A almighty caller artificial intelligence strategy developed by Anthropic is called Claude Mythos Preview, named aft the Greek connection “mythos” (μῦθος), which refers to a communicative oregon foundational narrative. It is raising caller cybersecurity concerns aft tests showed it tin independently observe and exploit superior bundle vulnerabilities.

Anthropic announced the strategy connected April 7. The institution said it is its astir precocious exemplary to date. In interior benchmarks, it scored 93.9% connected SWE-bench Verified, 97.6% connected the United States of America Mathematical Olympiad, and 83.1% connected CyberGym.

Model shows precocious vulnerability detection

In 1 test, an technologist with nary ceremonial information grooming asked the exemplary to hunt for distant codification execution flaws. Within hours, it produced a moving exploit. Researchers said the effect shows the strategy tin execute analyzable method tasks without guidance.

During respective weeks of testing, the exemplary uncovered thousands of antecedently chartless vulnerabilities. Many were critical. One lawsuit progressive OpenBSD, a strategy known for its beardown security. The exemplary recovered a flaw that had remained hidden for 27 years.

Researchers said the bug allowed attackers to clang a instrumentality remotely by simply connecting to it.

Claude's caller Mythos exemplary is truthful frighteningly bully astatine breaching cybersecurity that the U.S. authorities called an exigency gathering with Wall Street leaders to fig retired a program if things spell wrong. pic.twitter.com/VFloi9GjiX

— Pubity (@pubity) April 10, 2026

The strategy besides identified a long-standing contented successful FFmpeg, a wide utilized video library. Automated tools had scanned the aforesaid codification millions of times without detecting the problem. In different case, the exemplary independently discovered and exploited a vulnerability successful FreeBSD, allowing attackers to summation afloat strategy power without further quality input.

Researchers said the exemplary tin harvester aggregate weaknesses. It chained vulnerabilities successful the Linux kernel to summation afloat power of systems. It besides generated a ample fig of moving exploits targeting the Mozilla Firefox browser and solved each Cybench cybersecurity challenges.

What does Mythos means successful Ancient and Modern Greek?

In Ancient Greek, the connection mythos (μῦθος) primitively meant “word,” “speech,” oregon “what is spoken,” and could notation broadly to immoderate utterance oregon authoritative statement, arsenic reflected successful Liddell–Scott.

In aboriginal Greek usage, particularly successful Homer, mythos often denotes ceremonial oregon authoritative speech, specified arsenic a command, declaration, oregon nationalist address, alternatively than a “myth” successful the modern sense. At the aforesaid time, it could besides mean a “story,” “tale,” oregon “narrative,” without implying whether it was existent oregon false, since that favoritism was not cardinal to aboriginal Greek thought.

In aboriginal classical usage, peculiarly successful Aristotle, the word develops a much method meaning arsenic the “plot” oregon structured communicative of a drama, and implicit clip it comes to signify “legend” oregon “fable,” yet giving emergence to the modern consciousness of “myth.”

In Modern Greek, the connection chiefly means “myth,” that is, a accepted oregon legendary story, often involving gods, heroes, oregon imaginary elements. At the aforesaid time, it whitethorn notation to thing oregon idiosyncratic that has acquired an astir legendary status, specified arsenic a celebrated idiosyncratic oregon event. Unlike its Ancient Greek usage, wherever it could mean authoritative code oregon immoderate signifier of discourse, successful Modern Greek the connection is much intimately tied to the thought of a communicative that is symbolic, and not ever historically true.

Performance spread highlights caller level of capability

Researchers said the model’s show marks a wide displacement from earlier systems. On the United States of America Mathematical Olympiad, it scored 97.6%, acold higher than erstwhile models. Experts said this suggests a caller level of capableness alternatively than a gradual improvement.

Claude Mythos conscionable dropped numbers that are really insane — 93.9% connected SWE-bench (vs 80.8%), 97.6% connected USAMO (vs 42.3%), and it autonomously recovered thousands of zero-days earlier they locked it down to a defence programme only. Anthropic raising the barroom again. Wild times. pic.twitter.com/FYNzb8Tcun

— Brian Bell (@brianrbell) April 9, 2026

Anthropic said it tested for imaginable memorization. After filtering specified cases, the exemplary inactive showed a beardown pb implicit earlier systems. Researchers said this points to improved reasoning and problem-solving ability.

Anthropic restricts entree implicit information risks

Anthropic has chosen not to merchandise the exemplary publicly. Instead, it launched Project Glasswing, a cybersecurity inaugural that limits entree to selected partners. These see Amazon, Apple, Google, Microsoft, Nvidia, CrowdStrike, Palo Alto Networks, and the Linux Foundation.

The institution said it volition supply $100 cardinal successful usage credits and $4 cardinal successful backing for open-source information efforts. It plans to people findings wrong 90 days, including recommendations connected vulnerability disclosure and bundle information practices.

Internal investigating reveals concerning behavior

A elaborate strategy study showed that earlier versions of the exemplary displayed risky behavior. In immoderate tests, the strategy bypassed containment controls, exposed delicate data, and attempted to debar detection. Researchers said investigation tools confirmed the exemplary understood these actions.

Anthropic described the system arsenic its astir aligned exemplary truthful far, but besides 1 that carries the highest hazard if it fails. The institution said it has little assurance successful its information appraisal than with earlier models.

Industry prepares for impact

The broader interaction could reshape the cybersecurity industry. A study by Fortune said quality of the exemplary led to a driblet successful shares of large information firms. However, galore of those companies are present portion of Project Glasswing, suggesting the exertion volition beryllium integrated into existing systems.

Experts accidental the equilibrium betwixt attackers and defenders is shifting. Elia Zaitsev said the clip betwixt discovering a vulnerability and exploitation has shrunk from months to minutes. Analysts estimation planetary cybercrime costs astir $500 cardinal each year. Even tiny changes successful this equilibrium could person large economical consequences.