# glm-5.1 — API, Pricing & Context Window

`glm-5.1` is Zhipu AI's capable coding and reasoning model, offering a **200K-token context window** and reliable function calling at a competitive price. It's a strong open-weight-style option for agentic coding workloads.

On Vivgrid, `glm-5.1` is reachable through the unified, OpenAI-compatible endpoint, so it integrates cleanly alongside models from OpenAI, Anthropic, Google, and DeepSeek under one API key.

## Specifications

|     |     |
| --- | --- |
| **Provider** | Zhipu AI |
| **Model ID** | `glm-5.1` |
| **Best for** | Coding |
| **Context window** | 200,000 tokens |
| **Max output** | 128,000 tokens |
| **Modalities** | Text |
| **Tool / function calling** | Yes |
| **Knowledge cutoff** | 2026-03 |
| **Acceleration** | 🌐 Global (Centralized) |

## Pricing

Pricing in USD per 1M tokens, matching the provider's rates.

| Input | Cached input | Output |
| --- | --- | --- |
| $1.40 | $0.30 | $4.40 |

## Quick start

Call `glm-5.1` through Vivgrid's unified, OpenAI-compatible endpoint. Get an API key from the [Vivgrid Console](https://console.vivgrid.com/).

```
curl https://api.vivgrid.com/v1/chat/completions \
  -H "Authorization: Bearer $VIVGRID_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "glm-5.1",
    "messages": [\
      { "role": "user", "content": "Say hello in English, Chinese and Spanish." }\
    ],
    "stream": true
  }'
```

## Ideal use cases

- Cost-effective coding agents and CLIs
- Tool-calling workflows on Chat Completions
- General reasoning within a 200K-token context
- Teams diversifying beyond US-based providers

## Related models

- [glm-5.2](/content/docs/models/glm-5.2) — newer GLM with a 1M-token context window
- [kimi-k2.6](/content/docs/models/kimi-k2.6) — alternative high-context coding model
- [deepseek-v4-pro](/content/docs/models/deepseek-v4-pro/index.html) — flagship low-cost coding model