GLM-5.1 Breaks Records: The New #1 Open Source LLM for AI Agents

product #llm 📝 Blog|Analyzed: Apr 28, 2026 04:38•

Published: Apr 28, 2026 04:37

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1 min read

Analysis

The release of GLM-5.1 marks an incredible milestone for the open source community, showcasing how freely available models can now go toe-to-toe with industry titans. Developed by Z.ai using Huawei Ascend chips, this highly efficient Mixture of Experts architecture activates only 40 billion of its 754 billion parameters during inference, allowing for a massive 200K context window and an astounding eight hours of continuous autonomous execution. This breakthrough paves the way for developers to build highly capable, long-running coding agents without being locked into closed source ecosystems.

Key Takeaways

•GLM-5.1 is an impressive 754B parameter model that uses an efficient MoE design to activate only 40B parameters during inference.
•It outperforms major closed-source models like GPT-5.4 and Claude Opus 4.6 on the rigorous SWE-bench Pro coding benchmark.
•The model was entirely trained on Huawei Ascend 910B chips and supports up to 8 hours of continuous autonomous agent execution.

Reference / Citation

"GLM-5.1 recorded 58.4% on SWE-bench Pro, achieving the first-ever open source milestone by surpassing GPT-5.4 and Claude Opus 4.6."

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Qiita LLMApr 28, 2026 04:37

* Cited for critical analysis under Article 32.

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Source: Qiita LLM