Hy4 preview
Tencent: Hy4 preview is a mixture-of-experts model from Tencent, with 49B active parameters out of 770B total. It is designed for coding agents, complex tool-use workflows, and productivity tasks that require planning, context continuity, and sustained multi-step execution.
Specifications
| Lab | Tencent |
|---|---|
| Context window | 1M tokens |
| Input price | $0.83/1M |
| Output price | $2.50/1M |
| Release | Aug 2026 |
Strengths
- 49B active parameters in a 770B MoE design
- 1M-token context for long agent workflows
- Built for coding agents and tool use
Weaknesses
- Preview release with limited independent evaluation
- High total parameter count may constrain self-hosting
Best for
- Coding agents
- Complex tool-use workflows
- Long-context productivity tasks
In Depth: Hy4 preview
Summary
Hy4 preview is an AI model from Tencent.
Released in Aug 2026. It takes text input and produces text output, with a context window of 1M tokens. Input pricing is $0.83 per 1M tokens and output is $2.50 per 1M tokens on OpenRouter.