# Tencent — Introducing Hy4 preview

- Company: Tencent (tencent.com)
- Announced: 2026-08-27T16:00:00+00:00
- Category: new-model
- Subject: Hunyuan
- Open weights: yes
- Models affected: Hy4 preview
- Context window: 1M-token context window
- Pricing: $0.042 per 1M tokens for cached input, $0.834 per 1M tokens for input, $2.501 per 1M tokens for output
- Coverage: Covered by 7 outlets
- Source: https://hunyuan.tencent.com/research/hy4-preview
- Record: https://forck.live/items/4575-introducing-hy4-preview

Tencent releases Hy4 preview, a 770B-parameter model with 49B active parameters and a 1M-token context window, open-sourced and available on Tencent Cloud and OpenRouter.

## Evidence

Verbatim from https://hunyuan.tencent.com/research/hy4-preview:

> Today we're releasing Hy4 preview, our most capable model to date. It's a 770B-parameter model with 49B active parameters and a 1M-token context window... Hy4 preview is open-sourced and available today on Tencent Cloud and OpenRouter.

## Around this story

Outlets this record can name and link:

- bloomberg.com: https://bloomberg.com/news/articles/2026-08-28/tencent-touts-new-ai-model-it-claims-outperforms-z-ai-moonshot
- Reuters: https://reuters.com/world/asia-pacific/chinas-tencent-releases-new-open-source-ai-model-coding-research-tasks-2026-08-28
- Caixin Global — Tencent Unveils Larger AI Model in Bid to Close Gap With Rivals: https://caixinglobal.com/2026-08-28/tencent-unveils-larger-ai-model-in-bid-to-close-gap-with-rivals-102479258.html
- The Information: https://theinformation.com/briefings/tencents-new-flagship-ai-model-shows-major-progress
- TechNode — Tencent open-sources Hy4 preview with 770B parameters and a 1M-token context · TechNode: https://technode.com/2026/08/28/tencent-open-sources-hy4-preview-with-770b-parameters-and-a-1m-token-context
- Reuters — China's Tencent releases new open-source AI model for coding, research tasks - The Economic Times: https://economictimes.indiatimes.com/tech/technology/chinas-tencent-releases-new-open-source-ai-model-for-coding-research-tasks/articleshow/133588448.cms
- WOWTALE — Tencent Opens the Weights of a 770B Model — US Labs Close, Chinese Labs Open - WOWTALE: https://en.wowtale.net/2026/08/29/234927

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Record: https://forck.live/items/4575-introducing-hy4-preview
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