VercelEngineering PostOfficial Source
Hy4 Preview now available on AI Gateway
Tencent’s Hy4 Preview is now callable through Vercel AI Gateway and selectable in coding agents, adding an open MoE option with a 1M-token context window.
Vercel
Source Summary
Vercel AI Gateway now serves **tencent/hy4-preview**, an open-source Mixture-of-Experts model with **770B total parameters**, 49B active per token, and a **1M-token context window**.
Practical Implication
Builders can select it through the AI SDK or connect Claude Code, Codex, Cursor, and other agents using Vercel’s coding-agent setup. Its stated focus makes it worth evaluating on long-running repository tasks and large-document work.
Agent-Ready Context
Vercel AI Gateway now serves **tencent/hy4-preview**, an open-source Mixture-of-Experts model with **770B total parameters**, 49B active per token, and a **1M-token context window**. Builders can select it through the AI SDK or connect Claude Code, Codex, Cursor, and other agents using Vercel’s coding-agent setup. Its stated focus makes it worth evaluating on long-running repository tasks and large-document work. This is a preview announcement, not evidence of coding quality, latency, cost, or dependable use of the full context window. Benchmark it on your own agent loop before changing defaults.
Context Map
modelcodingresearch#open-models#coding-agents#model-selectionUncertainty
This is a preview announcement, not evidence of coding quality, latency, cost, or dependable use of the full context window. Benchmark it on your own agent loop before changing defaults.