Hy4 preview

Hy4 preview is Tencent's open-source flagship language model, built to handle advanced, long-running productivity and technical tasks. It can read through book-length documents at once, connect with external tools, and think through problems step by step before returning answers in structured formats. In day-to-day work, developers can instruct it to plan, debug, and verify complex programming workflows, create playable game prototypes from a single natural prompt, or refine visual interfaces in game engines across iterative discussions. Office teams and researchers can feed in multiple messy files to generate comprehensive reports, build financial models, or work through difficult theoretical questions across physics, molecular dynamics, and pure mathematics.

It is suited for software engineers, game creators, financial analysts, and scientific researchers who manage demanding projects that require synthesizing vast amounts of context. Compared to Tencent's earlier models, it has been substantially expanded in size and can digest much larger volumes of information in a single pass. As an early release, it has known drawbacks, such as taking longer than necessary to reason through complex assignments and showing a tendency to over-verify its own work.