# Hy4 Preview

> Tencent's Hy4 preview, open weights (Apache 2.0): a 770B MoE with 49B active, built for coding agents, complex tool use and productivity work. 1M context, reasoning, tool calling. Preview release.

Human version: https://kymaapi.com/models/hy4-preview
Live JSON: `GET https://kymaapi.com/v1/models` (no auth required)

## Facts

- **Model ID**: `hy4-preview`: pass this as `model` in the request body
- **Creator**: Tencent
- **Released**: 2026-08-28
- **Context window**: 1M tokens
- **Max output**: 64K tokens per response, a hard ceiling, not a default
- **Price**: $1.1259 in / $3.3764 out per 1M
- **Capabilities**: tools, reasoning

## Call it

```bash
curl https://kymaapi.com/v1/chat/completions \
  -H "Authorization: Bearer $KYMA_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"model": "hy4-preview", "messages": [{"role": "user", "content": "Hello"}]}'
```

## See also

- All models: https://kymaapi.com/models.md
- Pricing: https://kymaapi.com/pricing.md
- Other models by Tencent: https://kymaapi.com/models?q=Tencent