Hy4 preview
Hy4 preview is a large-scale mixture-of-experts model developed by Tencent. It is specifically engineered to support coding agents, complex tool-use workflows, and productivity-focused tasks. The model features a large context window and built-in reasoning capabilities.
Hy4 preview specs and pricing
- Provider: Tencent
- Released: August 28, 2026
- Context window: 1M tokens
- Max output: 64K tokens
- Input: text
- Output: text
- Price: $0.83 input / $2.50 output per 1M tokens
- Reasoning: yes
- Tool calling: yes
What Hy4 preview is good at
- Developing and debugging software code
- Executing multi-step tool-use workflows
- Managing complex productivity and reasoning tasks
To-dos to try with Hy4 preview
- Analyze this codebase and suggest a refactor for the authentication module
- Use the provided search and calculator tools to research and summarize the quarterly financial trends for this company
- Draft a project plan based on these requirements and identify potential technical dependencies
FAQ
- What is the primary focus of the Hy4 preview model? It is designed primarily for coding agents and complex workflows that require advanced reasoning and tool-use capabilities.
- Can this model process images? No, the model currently only supports text as both input and output.
- How much does Hy4 preview cost? Hy4 preview costs $0.83 per million input tokens and $2.50 per million output tokens through OpenRouter. In todo.is a typical agent step costs about 2.69 credits ($1 = 100 credits).
- What is the context window of Hy4 preview? Hy4 preview can read up to 1M tokens at once and write up to 64K tokens in one reply.
- Can I use Hy4 preview without coding? Yes. In todo.is you pick Hy4 preview as your agent's model and write to-dos in plain words, on the web, the Android app, WhatsApp or Telegram. No API key needed: credits are included, or you can bring your own key.
JavaScript is required to use the todo.is app.