Z.ai just released GLM-5.1, the first open-source model to top SWE-Bench Pro — beating GPT-5.4 and Claude Opus 4.6. But most Western developers have never heard of them. Here’s who they are and why they matter.
The basics
Z.ai (formerly Zhipu AI) is a Chinese AI company founded in 2019 as a spinoff from Tsinghua University’s Knowledge Engineering Group. They went public on the Hong Kong Stock Exchange in January 2026.
The company is best known for the GLM (General Language Model) family, which has evolved from a research project into one of the most capable open-source model families available.
Key facts
- Founded: 2019
- Origin: Tsinghua University spinoff
- IPO: January 2026 (Hong Kong Stock Exchange)
- Flagship model: GLM-5.1 (754B MoE, MIT license)
- Training hardware: Huawei Ascend 910B (no NVIDIA dependency)
- U.S. Entity List: Since January 2025
- Products: GLM models, GLM Coding Plan, Z.ai API
The GLM model family
Z.ai has released several generations of GLM models:
| Model | Parameters | Release | Notable |
|---|---|---|---|
| GLM-4 | Various | 2024 | First competitive model |
| GLM-4.5 | 355B MoE (32B active) | 2025 | Open-source push |
| GLM-4.6 | — | 2025 | Improved coding |
| GLM-4.7 | — | 2025 | GLM Coding Plan launch |
| GLM-5 | 744B MoE (40B active) | Feb 2026 | First frontier-class open model on Huawei chips |
| GLM-5-Turbo | — | Mar 2026 | Faster variant (proprietary) |
| GLM-5.1 | 754B MoE (40B active) | Apr 2026 | #1 on SWE-Bench Pro |
The jump from GLM-4.5 to GLM-5 was massive — scaling from 355B to 744B parameters and increasing training data from 23T to 28.5T tokens.
Why they matter
1. First frontier model without NVIDIA
GLM-5 and GLM-5.1 were trained entirely on 100,000 Huawei Ascend 910B chips. No NVIDIA hardware was used. This is the first demonstration that a competitive frontier model can be built completely outside the NVIDIA ecosystem.
This matters because Z.ai has been on the U.S. Entity List since January 2025, which bans access to H100/H200 GPUs. Rather than being blocked, they proved an alternative path exists.
2. Open source under MIT
While many Chinese AI labs use restrictive licenses, Z.ai chose MIT for GLM-5.1 — the most permissive open-source license available. Anyone can use, modify, and commercially deploy the model with no restrictions.
This is more permissive than Meta’s Llama license and matches DeepSeek’s approach.
3. Competitive with the best
GLM-5.1’s SWE-Bench Pro score of 58.4 puts it ahead of every proprietary model. Whether this lead holds under independent evaluation remains to be seen, but the gap between open and closed models has effectively closed for coding tasks.
4. The Coding Plan model
Z.ai’s GLM Coding Plan ($3-10/month) is one of the cheapest ways to access a frontier-class coding model. It works with Claude Code, OpenClaw, Cline, and other popular AI coding tools.
The geopolitical angle
Z.ai sits at the intersection of several major trends:
- U.S.-China AI competition: Proving frontier AI is possible without American chips
- Open vs closed source: Choosing MIT license while Meta goes proprietary with Muse Spark
- Hardware independence: Validating Huawei’s Ascend platform as a viable alternative to NVIDIA
The company’s success challenges the assumption that U.S. export controls can effectively limit Chinese AI development. If anything, the restrictions may have accelerated domestic chip development.
Products for developers
GLM Coding Plan — Subscription access to GLM models for AI coding tools:
- Lite: $3/month
- Pro: $10/month
- Max: Higher tier with GLM-5 access
All tiers support GLM-5.1, GLM-5-Turbo, GLM-4.7, GLM-4.6, GLM-4.5, and GLM-4.5-Air.
Z.ai API — Pay-per-token API access for custom integrations. OpenAI and Anthropic-compatible endpoints.
Hugging Face — All open-source models available for download at huggingface.co/zai-org.
Bottom line
Z.ai went from a university research lab to producing the world’s top-scoring coding model in under seven years. They did it on Chinese hardware, released it under MIT license, and priced it at $3/month.
Whether you care about the geopolitics or not, GLM-5.1 is a model worth knowing about. It’s free, it’s capable, and it’s available right now.
Related: GLM-5.1 Complete Guide · GLM-5.1 vs Claude vs GPT-5 · GLM-5.1 vs DeepSeek vs Qwen