Z.ai: GLM 5.1
Z.ai's GLM 5.1 posts world-class intelligence and strong agentic scores at very competitive pricing, making it one of the most capable models available by benchmark; however, limited Western enterprise support and availability means UK businesses should factor in deployment considerations before adopting it at scale.
Assessment date: April 16, 2026
Our methodology takes into account a range of factors including pricing, functionality, capabilities, benchmark performance, and real-world applicability. Rankings are reviewed and updated regularly as new models are released. Issues with our rankings? Contact us
Performance Profile
GLM-5.1 delivers a major leap in coding capability, with particularly significant gains in handling long-horizon tasks. Unlike previous models built around minute-level interactions, GLM-5.1 can work independently and continuously on..
Capabilities
Architecture
| Modality | Text → Text |
| Tokenizer | Other |
Performance Indices
Source: Artificial Analysis
This model was released recently. Independent benchmark evaluations are typically completed within days of release — these figures are preliminary and are likely to be updated as testing is finalised.
Benchmark Scores
Intelligence
Technical
Content
Benchmark data from Artificial Analysis and Hugging Face
How does Z.ai: GLM 5.1 stack up?
Compare side-by-side with other professional models.
Model Information
| OpenRouter ID |
z-ai/glm-5.1
|
| Provider | z-ai |
| Release Date | April 7, 2026 |
| Context Length | 202,752 tokens |
| Max Completion | 65,535 tokens |
| Status | Active |
Pricing
| Token Type | Cost per 1M tokens | Cost per 1K tokens |
|---|---|---|
| Input | $0.95 | $0.000950 |
| Output | $3.15 | $0.003150 |
Live Performance
Live endpoint metrics — refreshed every 30 minutes.
