Zhipu AI releases GLM-5.3, rivaling Fable 5 in coding and leading open-source security

Zhipu AI has released GLM-5.3, an open-source model that demonstrates significant improvements in coding capabilities, approaching the performance of Claude Fable 5. The model also excels in security, achieving the highest score among open-source models in a white-box code review and identifying numerous vulnerabilities, some dating back 40 years. GLM-5.3 has been tested on complex tasks, including generating a playable game and performing security audits and fixes, showcasing its ability to deliver production-ready software. AI

IMPACT Sets a new benchmark for open-source coding and security capabilities, potentially accelerating enterprise adoption of advanced AI agents.

RANK_REASON Frontier-lab model release with system card and benchmark claims. [lever_c_demoted from frontier_release: ic=1 ai=1.0]

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• Claude Fable 5
• Claude Opus 4.8
• DeepSeek V4 Pro
• Elon Musk
• GLM-5.3
• GPT-5.6 Sol
• Grok 4.6
• Karpathy
• Mythos 5
• Zhipu AI

• model release
• product

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