This AI Fixed 271 Bugs... and That’s the Problem

Anthropic’s Mythos AI just helped patch 271 bugs in Firefox 150, banks are rushing to get access, and somehow a private group already got their hands on it through a vendor leak.

Same tool. Three very different outcomes.

This wasn’t a normal update.

Mozilla used Mythos to scan and reason through massive chunks of code, not just run automated tests. The result? 271 vulnerabilities found and fixed.

👉 Read more: https://news.slashdot.org/story/26/04/21/2028206/mozilla-uses-anthropics-mythos-to-fix-271-bugs-in-firefox

What’s interesting is how it worked. Mythos didn’t just brute force errors. It traced logic paths, spotted edge cases, and flagged issues that usually take experts weeks.

That changes the scale completely. This is no longer “AI helps a bit.” This is AI doing deep security work at speed.

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At the same time, banks are trying to get access before attackers do.

Anthropic started with a small group, then slowly expanded under something called Project Glasswing. Now European banks are expected to join soon.

👉 Source: https://www.reuters.com/business/finance/banks-close-contact-with-european-regulator-anthropics-mythos-banker-says-2026-04-20/

The idea is simple. Let banks scan their own systems before someone else finds the holes.

Regulators are also paying attention. Some want broader access so no one institution gets an unfair advantage.

Here’s the part that makes people uneasy.

Reports say an unauthorized group accessed Mythos via a third-party vendor setup.

👉 Details: https://techcrunch.com/2026/04/21/unauthorized-group-has-gained-access-to-anthropics-exclusive-cyber-tool-mythos-report-claims/

No confirmed core breach, but that almost doesn’t matter. Even limited access is enough to raise alarms.

Because this tool is powerful in both directions.

It can fix vulnerabilities
But it can also help find new ones… fast

This week is basically a live demo of what AI in cybersecurity really looks like:

👉 Full context: https://www.bbc.com/news/articles/c2ev24yx4rmo

This is no longer theoretical.

The defender vs attacker race is now happening in real time, inside browsers, financial systems, and private networks.

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Tools like Mythos don’t stay contained for long.

Once something can scale intelligence like this, control becomes the real challenge.

Not whether it works.
But who gets to use it first.