Hy4 Preview from Tencent is now available on AI Gateway.

Hy4 Preview is an open-source Mixture-of-Experts model with 770B total parameters and 49B active per token, aimed at long-horizon coding, document analysis, game development, and scientific reasoning. It serves a context window of 1M tokens.

To use Hy4 Preview, set model to tencent/hy4-preview in the AI SDK :

import { streamText } from 'ai' ;

const result = streamText ( {

model : 'tencent/hy4-preview' ,

prompt : 'Add pagination to the results endpoint.' ,

} ) ;

To use it in a coding agent, see the coding agents guide , then run vercel ai-gateway coding-agents setup to connect agents like Claude Code, Codex, OpenCode, Cursor, Pi, and more and select tencent/hy4-preview inside the agent.

Try Hy4 Preview in the model playground .

AI Gateway provides a unified API for calling models, tracking usage and cost, and configuring retries, failover, and performance optimizations for higher-than-provider uptime.…