
GPT-5.5-Cyber Tops Mythos on CyberGym as Policy Tensions Loom
OpenAI's GPT-5.5-Cyber scores 85.6% on CyberGym, higher than Mythos 5 at 83.8%; the White House has not commented on a Mythos-like model, while Anthropic faces export controls limiting foreign nationals’ access. OpenAI expands international cybersecurity partnerships, and Mythos access was a talking point at the G7 summit, underscoring policy tensions shaping AI releases.

