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GLM-4.6 is an open-source large language model released by Zhipu AI (Z.ai) in September 2025, targeting complex reasoning and coding tasks. According to Z.ai's model page, the system ships with 357 billion parameters and a 200K-token context window, distributed under the MIT license for local download and use. Z.ai reported that GLM-4.6 outperformed its predecessor GLM-4.5 on multiple benchmarks, claiming state-of-the-art results among open-source models across eight public evaluations. In Z.ai's vendor-run CC-Bench head-to-head against Claude Sonnet 4, GLM-4.6 won 48.6% of tasks, tied 9.5%, and lost 41.9%, positioning it as a near-even open-weight competitor to frontier proprietary coding models.