# Tencent — Tencent Releases and Open-Sources Tencent Hy4 preview

- Company: Tencent (tencent.com)
- Announced: 2026-08-28T08:48:45+00:00
- Category: open-weight-release
- Coverage: not counted
- Announcement: yes
- Group: models
- Source: https://www.tencent.com/tencent-releases-and-open-sources-tencent-hy4-preview/
- Record: https://forck.live/items/7438-tencent-releases-and-open-sources-tencent-hy4-preview
- Subject: Hunyuan
- Open weights: yes
- Models affected: Hy4 preview, Hy3
- Context window: context window exceeding 1M tokens
- Pricing: USD 0.834 per million input tokens, USD 2.501 per million output tokens and USD 0.042 per million tokens for cache hits

Tencent released and open-sourced Hy4 preview, a 770B-parameter large language model with 49B active parameters and a context window exceeding 1M tokens. The model is available through Tencent products and via API, with free access on WorkBuddy and CodeBuddy for two weeks. API pricing is set at USD 0.834 per million input tokens, USD 2.501 per million output tokens, and USD 0.042 per million tokens for cache hits.

## Evidence

Verbatim from https://www.tencent.com/tencent-releases-and-open-sources-tencent-hy4-preview/:

> Tencent has released and open-sourced Tencent Hy4 preview, a next-generation large language model with 770B total parameters and 49B active parameters, and a context window exceeding 1M tokens.

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Record: https://forck.live/items/7438-tencent-releases-and-open-sources-tencent-hy4-preview
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