BREAKING: Anthropic is expected to release Claude Mythos tomorrow, the same model it said was too dangerous to make public.
A "Mythos 1" tag was briefly spotted inside the Claude Code UI last week before being pulled, signaling a public release is imminent.
In a restricted preview, Mythos found 271 vulnerabilities in Firefox alone, including a 15-year-old bug in Mozilla's HTML engine and a 20 year old flaw in its XML processor that years of human auditing had completely missed.
Mozilla went from patching 21 security issues per month to 423 in a single month.
When Mythos was first leaked in March:
CrowdStrike fell -7%
Palo Alto fell -6%
Zscaler fell -4.5%
Okta and Netskope fell -7%
Tenable crashed -9%
Cloudflare fell -13%
Thomson Reuters fell -19%
RELX fell -15%
LegalZoom crashed -20%.
The S&P 500 Software and Services Index fell 2.6% in a single session and is now down 12% since January.
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