Anthropic’s Claude Mythos Preview identified 271 security vulnerabilities in Firefox 150’s unreleased source code - twelve times what the previous best model found in the same browser one month earlier - and Mozilla patched every one before it shipped.

https://sharedsapience.com/the-century-report-april-22-2026/

Firefox CTO Bobby Holley compared Mythos’s work to “elite security researchers” and described the current moment as “finite” - for the first time, the speed of vulnerability discovery has overtaken the speed of vulnerability accumulation in production software. Engineering leaders at major companies are pulling thousands of engineers off projects for six-month security audits. The open question is how under-resourced open-source projects maintained by volunteers will access the same capability, given that much of the internet’s infrastructure depends on them.

The same day, Anthropic confirmed it is investigating unauthorized access to Mythos Preview through a third-party contractor’s credentials - a containment breach that occurred within hours of the restricted Project Glasswing release. The administration told CNBC it had “very good talks” with Anthropic and that the company “can be of great use,” completing a reversal from the Pentagon’s supply-chain risk designation six weeks ago. Capability of this specificity reshapes political positions faster than those positions can hold.

Meta began installing software on U.S. employees’ computers that captures keystrokes, mouse movements, and periodic screenshots to train autonomous AI agents - while simultaneously planning to lay off 10% of its workforce starting May 20. CTO Andrew Bosworth’s memo describes agents that “primarily do the work” with humans shifting to review roles. European labor law would likely prohibit this monitoring; in the United States, no federal limit on worker surveillance exists.

A federal judge ordered the administration to lift its blockade on new wind and solar projects, restoring 57 GW of capacity representing over $905 million in sunk investment. NERC is preparing its most serious alert tier after data center loads unexpectedly dropped 1,000 MW or more from the bulk power system in multiple incidents. And a triple-junction perovskite-on-silicon solar cell published in Nature exceeded 30% efficiency for the first time, pushing well past silicon’s practical ceiling.

Additional Reading:

* Ars Technica - Mozilla: Anthropic’s Mythos Found 271 Zero-Day Vulnerabilities in Firefox 150: https://arstechnica.com/ai/2026/04/mozilla-anthropics-mythos-found-271-zero-day-vulnerabilities-in-firefox-150/

* Guardian - Anthropic Investigates Report of Rogue Access to Mythos AI: https://www.theguardian.com/technology/2026/apr/22/anthropic-investigates-report-of-rogue-access-to-hack-enabling-mythos-ai

* Ars Technica - Meta Will Train AI Agents by Tracking Employees’ Mouse, Keyboard Use: https://arstechnica.com/ai/2026/04/meta-will-use-employee-tracking-software-to-help-train-ai-agents-report/

* Canary Media - US Judge Halts Trump Admin’s Blockade on New Wind and Solar Projects: https://www.canarymedia.com/articles/clean-energy/us-judge-halts-trump-admins-blockade-on-new-wind-and-solar-projects

* Shared Sapience - The Century Report April 8, 2026 (Project Glasswing): https://sharedsapience.com/the-century-report-april-8-2026/

* Shared Sapience - The Century Report April 20, 2026 (Chinese Tech Worker Displacement): https://sharedsapience.com/the-century-report-april-20-2026/

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271 Bugs in One Browser Pass - TCR 04/22/26