Z Ai: 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... Top-tier coding and long-horizon task completion Strong agentic reasoning for multi-step workflows Configurable reasoning depth for cost/quality tradeoffs Excellent instruction following on complex tasks Higher latency on deep reasoning mode Limited multimodal capabilities vs vision models Complex multi-file coding projects Autonomous agent workflows Deep reasoning and analysis
Specifications
| Lab | Z Ai |
|---|---|
| Context window | 202,752 |
| Input price | $0.98/1M |
| Output price | $3.08/1M |
| Release | 2026-04-01 00:00:00 |
Strengths
- Top-tier coding and long-horizon task completion
- Strong agentic reasoning for multi-step workflows
- Configurable reasoning depth for cost/quality tradeoffs
- Excellent instruction following on complex tasks
Weaknesses
- Higher latency on deep reasoning mode
- Limited multimodal capabilities vs vision models
Best for
- Complex multi-file coding projects
- Autonomous agent workflows
- Deep reasoning and analysis
In Depth: Z.ai: GLM 5.1
Summary
Z.ai: GLM 5.1 is an AI model from Z Ai.
Released 2026-04-01 00:00:00. It currently appears in the Overall category on LMRank. It supports Text input and produces Text output, with a context window of 202.8K tokens. Input pricing is $0.98 per 1M tokens and output is $3.08 per 1M tokens on OpenRouter.