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Hy4 Preview

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Tencent's open-sourced mixture-of-experts language model with a context window above one million tokens

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TrustList summary

Hy4 Preview is a language model released and open-sourced by Tencent on 28 August 2026. It uses a mixture-of-experts design, and Tencent describes its context window as exceeding one million tokens. It is offered through Tencent Cloud TokenHub and OpenRouter and sits inside several Tencent products.

Features

  • Mixture-of-experts architecture: 770B parameters in total, of which 49B are active for each token.
  • Long context: a window Tencent says goes beyond one million tokens.
  • API access: available via Tencent Cloud TokenHub and OpenRouter.
  • Product integration: used in WorkBuddy, CodeBuddy, Yuanbao and ima.

Key facts

  • Developer: Tencent.
  • Released: 28 August 2026.
  • Vendor evaluation: Tencent's own blind test, with 163 experts across 203 engineering tasks, gave it an average of 2.99 out of 4. This is a vendor result that cannot be independently reproduced, not a benchmark score.
  • Throughput: Tencent reports a 31.8 per cent gain from inference optimisation.
  • Licence: the announcement does not name one.

Summary written by TrustList from the business's own published information, Oct 2026.

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Trust Score

4/ 100
Trust Score: New

An earned signal from verification, reviews, awards, transparency and engagement - the vendor can't buy it.

Verification
0/100 · 20%
Reviews
0/100 · 30%
Awards
0/100 · 15%
Transparency
18/100 · 20%
Engagement
0/100 · 15%
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Updated 9/16/2026

What the business tells TrustList

Founded
2026 (0 years) evidence sent

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