Tencent Open Sources Hy3 Preview to Scale Efficient Agentic Reasoning
Agentic Coding
LLM
AI Research
AI Agent
Performance
Tencent, a developer of foundation models for multimodal generation, open-sourced the weights for Hy3 preview, a large model optimized for reasoning and agentic tasks. The model features 295B total parameters but maintains efficiency by activating only 21B parameters (the subset of the model used per request).
The release mirrors the pattern seen in Alibaba's high-efficiency models, prioritizing massive knowledge capacity while maintaining low inference costs. By focusing on reasoning and agentic capabilities, Hy3 preview provides a cost-effective alternative for developers building autonomous systems that require high-performance logic without the overhead of traditional monolithic models.
You can deploy the model for complex agentic workflows and multi-step reasoning tasks that require high cost-efficiency. The weights are available on Hugging Face for self-hosting, and the model is currently live on OpenRouter with a free usage tier available through May 8th, 2026.
Frequently asked questions
- What is Tencent Hy3 preview?
- Hy3 preview is a large language model from Tencent designed for reasoning and agentic tasks. It uses a Mixture-of-Experts architecture, meaning it has a large total capacity of 295 billion parameters but only uses 21 billion parameters per request. This design allows the model to handle complex logic while remaining efficient to run.
- Is Tencent Hy3 preview open source?
- Yes, Tencent has open-sourced the weights for the Hy3 preview model. Developers can download and host the model themselves by accessing the repository on Hugging Face. This open-weight release allows for private deployment and fine-tuning for specific enterprise or research use cases without relying on a proprietary API provider.
- How can I use Tencent Hy3 preview?
- You can access Hy3 preview by downloading the weights from Hugging Face for local or cloud hosting. Alternatively, the model is available through the OpenRouter API. Tencent is offering a free usage tier on OpenRouter until May 8th, 2026, allowing developers to test its reasoning and coding capabilities before committing to a paid plan.
- What is the context window for Hy3 preview?
- Hy3 preview supports a context window of 256,000 tokens. This large window allows the model to process and reason across extensive documents, entire codebases, or long conversation histories in a single interaction. This capability is particularly useful for building retrieval-augmented generation systems and autonomous agents that need to maintain deep context over multiple steps.
