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Tencent Open-Sourced a 770B Model and Put It Free Inside Its Own Productivity Suite for Two Weeks
Tencent released Hy4 preview on 2026-08-28: 770B total parameters, 49B active, over 1M token context, open-sourced and simultaneously available through Tencent Cloud TokenHub and OpenRouter at $0.834 per million input tokens, $2.501 per million output and $0.042 per million cached. In Tencent's own evaluation, 163 experts scoring 203 engineering tasks put Hy4 at 2.99/4.00 against GLM-5.3 at 2.92 and Kimi K3 at 2.94. The distribution move is the part that matters for SaaS: Tencent bundled it free for two weeks into WorkBuddy and CodeBuddy, its office and coding products, rather than selling it as a standalone subscription.
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