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Claude Mythos

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Mozilla Says Claude Mythos Helped Find 271 Firefox Bugs

… Claude Mythos Preview is an unreleased frontier‑class model that Anthropic is testing under its restricted Project Glasswing program. Mozilla first ran a trial with Anthropic's Claude Opus 4.6 model, which scanned thousands of C++ files and found dozens of security‑relevant reports in Firefox 148. …

Apr 24, 2026 · Devesh Beri

Claude Mythos can exploit decades-old vulnerabilities, but Anthropic is keeping it locked down

… What do we know about Claude Mythos? Everything Anthropic has said, so far Claude Mythos Preview is a substantial jump from its preceding models, and the benchmarks attest to that fact. …

Apr 16, 2026 · Abhinav Raj

Anthropic's Claude Mythos AI has discovered thousands of vulnerabilities in every OS and browser

… "The fallout - for economies, public safety, and national security - could be severe." And with that, Claude Mythos won't be getting a public release anytime soon, but it's currently being deployed as part of the new Project Glasswing initiative designed to "secure the world's most critical softwar… …

Apr 8, 2026 · Kosta Andreadis

Anthropic's Claude Mythos found 271 Firefox vulnerabilities - CTO calls it just as capable as 'elite security researchers'

… While not surpassing elite human researchers, Mythos offers efficient vulnerability analysis, though restricted access aims to prevent misuse in cyberattacks. 0:00 / --:-- Use left and right arrow keys to seek audio. Anthropic's unreleased Claude Mythos is at the center of a cybersecurity debate. …

Apr 22, 2026 · Hassam Nasir

Discussions and forums

Hacker News · u/djfergus · 3d ago

From-scratch reimplementation of Mythos Glasswing pipeline

Hacker News · u/alexvoica · 1w ago

Automating code security review: Mythos-level capabilities at lower cost

Mozilla says it patched 271 Firefox vulnerabilities thanks to Anthropic's Claude Mythos - Engadget

… However, Mozilla shared some details that support use of the company's special Claude Mythos Preview model as a way to protect critical services. Using Mythos helped Mozilla's team find and patch 271 vulnerabilities in the latest release of the Firefox browser. …

Apr 21, 2026 · Anna Washenko

Mozilla is sharing more details about some of the 271 Firefox bugs identified by Claude Mythos Preview.

… Link: Behind the Scenes Hardening Firefox with Claude Mythos Preview – Mozilla Hacks - the Web developer blog | https://hacks.mozilla.org/2026/05/behind-the-scenes-hardening-firefox/ | Mozilla Hacks – the Web developer blog

May 7, 2026 · Jay Peters

NCSC waarschuwt bedrijven voor Claude Mythos: patch sneller en gebruik zelf AI

Het Nederlandse Nationaal Cyber Security Centrum waarschuwt bedrijven voor AI-modellen zoals Claude Mythos. …

Apr 10, 2026 · Hayte Hugo

Autonom Sicherheitslücken ausnutzen: BSI warnt vor Konsequenzen von Modellen wie Claude Mythos

… Es stellt sich aber die Frage, inwieweit so mächtige Modelle wie Claude Mythos auf dem freien Markt verfügbar sein werden. Claude Mythos ist nicht für Allgemeinheit geplant Bislang hat Anthropic nicht die Absicht, das neue Spitzenmodell für die Allgemeinheit freizugeben. …

Apr 10, 2026 · Andreas Frischholz

Een omslag voor cybersecurity: Claude Mythos is té goed in lekken vinden

… Waarom Claude Mythos niet direct uitkomt Claude Mythos is niet gemaakt voor het vinden van zerodays, zegt Anthropic. …

Apr 22, 2026 · Arnoud Wokke

Anthropic is investigating 'unauthorized access' of its Mythos cybersecurity tool - Engadget

… "We're investigating a report claiming unauthorized access to Claude Mythos Previous through one of our third-party vendor environments," Anthropic said in a statement. The Claude Mythos Preview arrived earlier this month as part of " Project Glasswing " with significant fanfare. …

Apr 22, 2026 · Steve Dent

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