Z.ai: GLM 5.1
Analysis Summary
Z.ai GLM 5.1 is a capable mid-tier model with a strong agentic index, placing it among the more reliable options for multi-step tool use and function calling workflows. Its intelligence index sits in the very strong range, backed by high GPQA and tau2 scores that reflect solid scientific reasoning and task completion reliability. The 200K context window supports longer document workflows.
For businesses, GLM 5.1 suits agentic pipelines, automated coding assistance, and structured task execution where reliable tool use matters. Its coding index is competent without being world-class, and the lack of vision support limits its use in multimodal workflows. The provider has limited adoption in enterprise environments, which is reflected in a modest penalty.
Pricing is reasonable at under $1 input and $3.08 output per million tokens, making it cost-effective for agentic workloads. Teams already comfortable with this provider will find it a capable workhorse for agent-driven automation.
Assessed June 17, 2026
Editorial notes
Z.ai GLM 5.1 delivers strong agentic performance with tool use and function calling, a 200K context window, and competitive reasoning across science and coding benchmarks.
Rankings consider pricing, capabilities, benchmarks, and real-world applicability and are refreshed as new models launch. Feedback?
Performance Profile
How Z.ai: GLM 5.1 compares
Z.ai: GLM 5.1 ranks #26 of 380 AI models we track for overall intelligence, #31 of 317 for coding, #12 of 292 for agentic tasks. Its 203K-token context window is larger than 66% of the models we list. At $0.98 per million input tokens it is cheaper than 25% of comparable models.
About Z.ai: GLM 5.1
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.
Leaderboard Categories
External Resources
Frequently asked questions about Z.ai: GLM 5.1
How much does Z.ai: GLM 5.1 cost?
Z.ai: GLM 5.1 costs $0.98 per million input tokens and $3.08 per million output tokens.
What is the context window of Z.ai: GLM 5.1?
Z.ai: GLM 5.1 has a context window of 202,752 tokens (203K).
Is Z.ai: GLM 5.1 good for coding?
On our coding benchmark index, Z.ai: GLM 5.1 ranks #31 of 317 models, placing it in the top quartile of the field for code generation and debugging.
What can Z.ai: GLM 5.1 do?
Z.ai: GLM 5.1 supports tool use and function calling.
Who created Z.ai: GLM 5.1?
Z.ai: GLM 5.1 is developed by Z.ai and was released on April 7, 2026.
