# Z.ai: GLM 5.1

`z-ai/glm-5.1` — **openrouter** · CHAT

> Z.ai: GLM 5.1 (z-ai/glm-5.1) is a chat model from openrouter with a 202.8K-token context window; open-weight; capabilities tools, reasoning; input text; output text.

| Field | Value |
| --- | --- |
| Vendor | openrouter |
| Kind | CHAT |
| Context window | 202,752 tokens |
| Max output tokens | 65,535 tokens |
| Indicative price (US list) | $1.05 in / $3.5 out per 1M tokens (indicative US list — verify with vendor) |
| Input modalities | text |
| Output modalities | text |
| Capabilities | tools, reasoning |
| Weights | Open-weight |
| Release date | 2026-04-07 |
| Sources | committed, models-dev, openrouter-api |
| Last verified | 2026-11-05 |

*Part of the [Model Catalog](https://models.viglet.org/) — [openrouter models](https://models.viglet.org/models/openrouter/) · [Vendor JSON](https://models.viglet.org/by-vendor/openrouter.json) · [HTML](https://models.viglet.org/models/openrouter/z-ai-glm-5.1.html)*