GLM 5.1
GLM-5.1 delivers a major leap in coding capability, with particularly significant gains in handling long-horizon tasks.
Specifications
| Lab | Z.ai |
|---|---|
| Context window | 204.8K tokens |
| Input price | $0.96/1M |
| Output price | $3.03/1M |
| Release | Apr 2026 |
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: GLM 5.1
Summary
GLM 5.1 is an AI model from Z.ai.
Released in Apr 2026. It currently appears in the Overall category on LMRank. It takes text input and produces text output, with a context window of 204.8K tokens. Input pricing is $0.96 per 1M tokens and output is $3.03 per 1M tokens on OpenRouter.