Open-weight models trail closed models in cyber capabilities by 6–7 months
Z.ai’s GLM-5.3 is the top open-weight model on Epoch’s Cyber ECI, scoring where the closed-weight frontier stood 6–7 months earlier.
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Open-weight models, which have publicly available code and weights, currently score lower on cybersecurity capabilities than closed-weight models from major AI companies. The highest-scoring open-weight model on the Cyber ECI, a cybersecurity-focused capability index, ranks approximately 6 to 7 months behind the leading closed-weight models in this domain. This gap matters because it shows a measurable capability difference between the two model types in a specific and important technical area. The comparison uses cybersecurity benchmarks to place different models on a common scale, allowing researchers to track how fast the open and closed frontiers are advancing relative to each other.
Explainer: GLM 5.2: How a 744B Open Model Is Closing the Gap With Claude Opus on Code
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