Z.ai: GLM 5.1
Analysis Summary
Z.ai: GLM 5.1 sits in the Professional tier on our leaderboard, ranked #19 of 544 published models on overall intelligence. At $1.05 input and $3.50 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 posts world-class intelligence and strong agentic scores with excellent instruction following and competitive pricing, though it lacks vision support and has limited enterprise adoption outside its home market.
Assessed May 5, 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 |
| Max Completion | 65,535 tokens |
| Status | Active |
Pricing
| Token Type | Cost per 1M tokens | Cost per 1K tokens |
|---|---|---|
| Input | $1.05 | $0.001050 |
| Output | $3.50 | $0.003500 |
Live Performance
Live endpoint metrics — refreshed every 30 minutes.
