# Z.ai: GLM 5.1: AI model fact sheet

- **Provider:** z-ai
- **Released:** 2026-04-07
- **Context window:** 202,752 tokens
- **API pricing:** $1.40 / 1M input, $4.40 / 1M output
- **OpenRouter ID:** z-ai/glm-5.1
- **Capabilities:** conversation, reasoning, code-generation, analysis, agentic-tool-use, tool-use, planning

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 a single task for more than 8 hours, autonomously planning, executing, and improving itself throughout the process, ultimately delivering complete, engineering-grade results.

## Benchmarks

| Benchmark | Score |
| --- | --- |
| SWE-Bench Pro | 58.4% |
| AIME 2026 | 95.3% |

Source: real side-by-side outputs, pricing and specs at https://rival.tips/models/glm-5.1