UK's AI Security Institute Finds Open-Weight Models Are
AI Security & Red-TeamingUK government testing confirms the open-weight/closed-weight cyber-capability gap has narrowed to four-to-seven months, down from six-to-ten months in 2025: GLM-5.2 and DeepSeek V4-Pro now approach frontier models like Claude Opus 4.6 on narrow tasks, though closed models still lead on complex, chained attacks, and open models cost up to 45 times less per task.