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I built an agentic coding exam for Hy4 preview, then made the model sit it

This story is from 2026-08-29. It is preserved in the archive; the latest stories are on the live feed.

Tencent open-sourced Hy4 preview on 28 August 2026. 770B parameters, 49B active per token, a 1M context, Apache 2.0 weights, and a model card that admits two unflattering things about itself: it "spends longer than necessary reasoning through complex tasks" and it has "a tendency to over-verify its…

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  1. 2026-08-29 11:14 · DEV Community — AI
    I built an agentic coding exam for Hy4 preview, then made the model sit it

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