# Z.ai, also known as Zhupai AI, a Chinese AI startup best known for its powerful, open source GLM family of models, has unveiled GLM-5.1.

*genai · news · 2026-04-07 · VentureBeat*

## Key points

- Z.ai's GLM-5.1 is a 754B parameter open-source model released under the MIT License, enabling commercial use.
- GLM-5.1 can autonomously execute tasks for up to eight hours, far exceeding previous agentic model limits.
- The model surpassed GPT-5.4, Claude Opus 4.6, and Gemini 3.1 Pro on SWE-Bench Pro coding benchmarks.
- GLM-5.1 achieves performance gains by switching strategies autonomously during extended tool-based optimization loops.
- Z.ai is pioneering a hybrid strategy, keeping high-speed models proprietary while open-sourcing flagship intelligence.

**Companies:** Z.ai
**Countries:** China

[Read the full story on VentureBeat](https://venturebeat.com/technology/ai-joins-the-8-hour-work-day-as-glm-ships-5-1-open-source-llm-beating-opus-4)

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