Open-weight AI models rapidly close performance gap with frontier models

Open-weight AI models are rapidly closing the performance gap with frontier models, particularly in cybersecurity capabilities. According to the British AI Security Institute, the lag has reduced from six to ten months at the start of 2025 to just four to seven months currently. However, the institute also noted that safety measures on these open-weight models are largely ineffective, potentially leaving defenders with insufficient preparation time. AI

IMPACT Open-weight models are becoming competitive with frontier models, potentially lowering costs and increasing accessibility, but also raising safety concerns.

RANK_REASON The item discusses research findings on the performance and safety of open-weight AI models compared to frontier models. [lever_c_demoted from research: ic=1 ai=1.0]

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• British AI Security Institute
• DeepSeek V4-Pro
• frontier cyber performance
• GLM-5.2
• open-weight models

• model release
• safety

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