# Zhipu AI release of GLM-5.3 model > Live situation record from CLSTR: https://clstr.news/situations/zhipu-ai-release-of-glm-5-3-model > Updated: 2026-08-16T04:50:39.000Z. Sources: 23. Developments: 2. Zhipu AI (also referred to as Z. ai) has released GLM-5.3, a large language model optimized for programming and cybersecurity. Although the model utilizes the same 743-billion-parameter Mixture of Experts base as GLM-5.2, it achieves performance gains through expanded post-training scaling. In technical benchmarks, the model shows a 50% improvement in coding tasks and an 84.5% success rate in CyberGym cybersecurity testing, surpassing competitors such as Anthropic’s Mythos 5 and OpenAI’s GPT-5. 6 Sol. The model features a 1 million token context window and is designed for long-horizon tasks and agentic capabilities, including tool calling via MCP. While GLM-5.3 shows strength in vulnerability detection, outperforming Mythos 5’s 83.8% with its 84.5% score, it trails Western competitors in offensive capabilities. In the Exploit Bench test, which measures the ability to convert vulnerabilities into functional attacks, GLM-5.3 scored 54.4% compared to Mythos 5’s 78.0%. GLM-5.3 is currently accessible via API, the GLM Coding Plan, and ZCode. The company intends to release the full model weights to the public following safety evaluations and hardening processes. ## Timeline ### 2026-08-16: Zhipu AI releases GLM-5.3 to rival Anthropic in coding and security Chinese startup Zhipu AI released GLM-5.3, an open-weight AI model that rivals Anthropic in cybersecurity detection and coding, though it trails in functional exploit capabilities. 9 sources. https://clstr.news/cluster/z-ai-releases-glm-5-3-with-enhanced-coding-and-cybersecurity-capabilities ### 2026-08-14: Zhipu AI launches GLM-5. 3 with enhanced coding and cyber capabilities Zhipu AI launched GLM-5. 3, an open-weight model that uses enhanced post-training to significantly boost coding and cybersecurity performance, rivaling top US-based AI models. 15 sources. https://clstr.news/cluster/zhipu-ai-releases-glm-53-with-enhanced-coding-and-agent-capabilities --- Cite as: Zhipu AI release of GLM-5.3 model. CLSTR, https://clstr.news/situations/zhipu-ai-release-of-glm-5-3-model