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Event Brief
May 1, 2026 at 1:00 PM ET

GPT-5.5 matches Mythos Preview in cybersecurity tests

By The BriefBrief
New cybersecurity test results indicate Mythos' threat is not specific to one model.
WHO: GPT-5.5
WHAT: Cybersecurity evaluation comparing GPT-5.5 performance against Mythos Preview
WHEN: May 1, 2026 at 11:32 AM ET
WHERE: Location not specified
WHY: No specific cause was reported.
Sources (1): Ars Technica

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