# TechNode — Tencent open-sources Hy4 preview with 770B parameters and a 1M-token context

- Company: TechNode (technode.com)
- Announced: 2026-08-28T13:32:49+00:00
- Category: open-weight-release
- Coverage: 7 outlets
- Announcement: yes
- Group: models
- Source: https://technode.com/2026/08/28/tencent-open-sources-hy4-preview-with-770b-parameters-and-a-1m-token-context/
- Record: https://forck.live/items/5072-tencent-open-sources-hy4-preview-with-770b-parameters-and-a-1m-token-context
- Subject: Reporting
- Open weights: yes
- Models affected: Hy4 preview
- Context window: exceeding 1 million tokens
- Pricing: $0.834 per million input tokens and $2.501 per million output tokens

Tencent open-sourced Hy4 preview, a large language model with 770 billion total parameters, 49 billion activated parameters, and a context window exceeding 1 million tokens. The model is available through WorkBuddy, CodeBuddy, Yuanbao, and ima, with API access via Tencent Cloud TokenHub and OpenRouter. In internal evaluations, it scored 2.99 out of 4, outperforming GLM 5.3 and Kimi K3, and helped optimize training and inference systems.

## Evidence

Verbatim from https://technode.com/2026/08/28/tencent-open-sources-hy4-preview-with-770b-parameters-and-a-1m-token-context/:

> Tencent Hunyuan released and open-sourced Hy4 preview on Aug. 28. The next-generation large language model has 770 billion total parameters, 49 billion activated parameters and a context window exceeding 1 million tokens.

---

Record: https://forck.live/items/5072-tencent-open-sources-hy4-preview-with-770b-parameters-and-a-1m-token-context
Catalogue: https://forck.live/llms.txt
Current issue: https://forck.live/feed.md