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Daybreak

3 articles · Page 1 of 1
Black & White Path
Black & White Path
Jun 24, 2026 · Information Security

OpenAI’s GPT‑5.5‑Cyber Beats Mythos with 85.6% on CyberGym

OpenAI’s new GPT‑5.5‑Cyber model outperforms Anthropic’s Mythos on multiple security benchmarks, achieving 85.6% on CyberGym and 39.5% on ExploitGym, while the accompanying Daybreak initiative introduces the Codex Security plugin, Patch the Planet programme, and trusted‑access collaborations, prompting a shift in defensive priorities toward rapid patching.

AI securityCodex SecurityCyberGym
0 likes · 7 min read
OpenAI’s GPT‑5.5‑Cyber Beats Mythos with 85.6% on CyberGym
Machine Heart
Machine Heart
Jun 23, 2026 · Artificial Intelligence

How GPT‑5.5‑Cyber Beats Mythos 5 in CyberGym Benchmarks

OpenAI’s new GPT‑5.5‑Cyber model achieves a top‑of‑the‑line 85.6% score on CyberGym—surpassing both the prior GPT‑5.5 (81.8%) and Anthropic’s Mythos 5 (83.8%)—while also delivering broader security tools such as Codex Security, the Patch the Planet initiative, and a partner program for trusted access.

AI securityCodex SecurityCyberGym
0 likes · 12 min read
How GPT‑5.5‑Cyber Beats Mythos 5 in CyberGym Benchmarks