Z.ai’s new GLM-5.3 is blasting through cybersecurity AI benchmarks, scoring an impressive 84.5% on CyberGym—outpacing rivals like Anthropic’s Mythos 5 and OpenAI’s GPT-5.6 Sol. While it shows major gains on ExploitBench, it still trails behind on exploit-focused tests. The model’s leap comes from post-training refinements, not a new base, and its Security Disclosure Ledger logs over 2,000 real-world vulnerabilities. Developers: update your API configs before deploying. Weights coming soon—but for now, this score makes GLM-5.3 the hottest contender in AI-driven security.
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