GPT-5.5 Matches Mythos on Cyber Attacks. One's in Your API Key.
Key Takeaways
- GPT-5.5 scored 71.4% on UK AISI expert-level cyber benchmarks versus Mythos' 68.6%. And GPT-5.5 is available to anyone with an API key. - AI cyber capability now doubles every 4 months. The November 2025 estimate was 8 months. That gap between attackers