Z.ai: GLM 5.1
Analysis Summary
Z.ai: GLM 5.1 sits in the Professional tier on our leaderboard, ranked #58 of 561 published models on overall intelligence. At $0.980 input and $3.08 output per 1M tokens, it is among the most expensive on the market. It offers a generous context window for extended reasoning and code review and supports tool use and function calling.
Editorial notes
GLM 5.1 from Z.ai delivers strong agentic capability and high tau2 scores with tool use at moderate pricing, but coding and long-context performance are below its intelligence tier peers.
Assessed May 24, 2026
Rankings consider pricing, capabilities, benchmarks, and real-world applicability and are refreshed as new models launch. Feedback?
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
Performance Indices
Source: Artificial Analysis
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 |
| Status | Active |
Pricing
| Token Type | Cost per 1M tokens | Cost per 1K tokens |
|---|---|---|
| Input | $0.98 | $0.000980 |
| Output | $3.08 | $0.003080 |
Live Performance
Live endpoint metrics — refreshed every 30 minutes.
