3h ago

Anthropic has operated Mythos Preview and Mythos-class models internally for three months as part of Project Glasswing amid insufficient safeguards for public release

Plans include work with US and allied governments after safeguards improve.

0
Original post

Last month we launched Project Glasswing, our collaborative AI cybersecurity initiative. Since then, we and our partners have found more than ten thousand high- or critical-severity vulnerabilities in essential software.

12:38 PM · May 22, 2026 View on X

Update on Mythos and Project Glasswing: 'Next, we will work with critical partners—including US and allied governments—to expand Project Glasswing to additional partners. And in the near future, once we’ve developed the far stronger safeguards we need, we look forward to making Mythos-class models available through a general release.'

AnthropicAnthropic@AnthropicAI

Last month we launched Project Glasswing, our collaborative AI cybersecurity initiative. Since then, we and our partners have found more than ten thousand high- or critical-severity vulnerabilities in essential software.

7:38 PM · May 22, 2026 · 403K Views
7:51 PM · May 22, 2026 · 18.6K Views

'For the last few months, Anthropic has used Mythos Preview to scan more than 1,000 open-source projects, which collectively underpin much of the internet—and much of our own infrastructure.

So far, Mythos Preview has found what it estimates are 6,202 high- or critical-severity vulnerabilities in these projects (out of 23,019 in total, including those it estimates as medium- or low-severity).'

Andrew CurranAndrew Curran@AndrewCurran_

Update on Mythos and Project Glasswing: 'Next, we will work with critical partners—including US and allied governments—to expand Project Glasswing to additional partners. And in the near future, once we’ve developed the far stronger safeguards we need, we look forward to making Mythos-class models available through a general release.'

7:51 PM · May 22, 2026 · 18.6K Views
8:02 PM · May 22, 2026 · 3K Views

Anthropic isn't releasing Mythos. The Official reason is that it's too dangerous and could be used to exploit zero-days at scale.

Honest poll: how many of you think that if Anthropic had the compute to serve Mythos to everyone, they would still be holding it back?

Quite the coincidence that safety narratives and compute constraints have started to rhyme so perfectly, no?

AnthropicAnthropic@AnthropicAI

Last month we launched Project Glasswing, our collaborative AI cybersecurity initiative. Since then, we and our partners have found more than ten thousand high- or critical-severity vulnerabilities in essential software.

7:38 PM · May 22, 2026 · 403K Views
10:40 PM · May 22, 2026 · 177 Views

doomers are going to love this sentence

btw it's been 3 months since claude mythos was deployed internally, meaning that time-horizons have almost doubled again

7:45 PM · May 22, 2026 · 6.8K Views

Anthropic: "once we've developed the far stronger safeguards we need, we look forward to making Mythos-class models available through a general release"

7:47 PM · May 22, 2026 · 4.9K Views

@AndrewCurran_ The safeguards:

Andrew CurranAndrew Curran@AndrewCurran_

Update on Mythos and Project Glasswing: 'Next, we will work with critical partners—including US and allied governments—to expand Project Glasswing to additional partners. And in the near future, once we’ve developed the far stronger safeguards we need, we look forward to making Mythos-class models available through a general release.'

7:51 PM · May 22, 2026 · 18.6K Views
9:33 PM · May 22, 2026 · 262 Views