Z.AI Releases GLM-5.1: Open-Weight 754B Agentic Model with SOTA SWE-Bench Pro Results and 8-Hour Autonomous Execution

Summary

Z.AI has introduced GLM-5.1, a 754 billion parameter open-weight model designed specifically for agentic workloads. The model reportedly achieves state-of-the-art performance on SWE-Bench Pro, a benchmark measuring the ability of AI systems to autonomously resolve real-world software engineering tasks, and can sustain autonomous execution for up to 8 hours — a significant leap in agent endurance compared to prior systems that typically operate in shorter task windows. The open-weight release at