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Epoch AI's cyber-focused Capabilities Index, using data to 8 October 2026, finds that Z.ai's GLM-5.3, the strongest open-weight model, scores 160, between OpenAI's GPT-5.4 from March and Anthropic's Claude Mythos Preview from April, which leaves open-weight AI 6–7 months behind closed models on cyber skills
Verified 2026-10-20
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