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