Z.ai has released GLM-5.1, a 744B parameter Mixture-of-Experts model that achieved a score of 58.4% on the SWE-Bench Pro leaderboard in April 2026. This marks the first open-weight model to surpass leading proprietary models like GPT-5.4 and Claude Opus 4.6 on this benchmark, which tests real-world coding capabilities. While the model is designed for autonomous software development tasks, its MIT license allows for unrestricted commercial use and modification, differentiating it from other high-tier models. AI
IMPACT Sets new SOTA on coding benchmarks for open-weight models, potentially accelerating adoption and research in software development agents.
RANK_REASON Open-weight model release with benchmark results surpassing SOTA. [lever_c_demoted from frontier_release: ic=1 ai=1.0]
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