Z.ai: GLM 5.1
Analysis Summary
Z.ai: GLM 5.1 sits in the Professional tier on our leaderboard, ranked #21 of 556 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 world-class agentic scores, strong reasoning, and excellent instruction following with tool use and a 202K context at moderate pricing.
Assessed May 14, 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.
