Tencent HY4 IS SOLID! Best Open-Weight Model? (FULLY FREE)
Tencent’s newly released open-weight HY4 model is a massive 770B-parameter AI with 49B active parameters and a 1M-token context window, delivering strong results in coding, reasoning, agents, and long-horizon tasks while remaining competitively priced and heavily compressed without major benchmark loss.
MAIN POINTS FROM TRANSCRIPT
- HY4 is Tencent’s most capable model, with 770B parameters, 49B active parameters, and a 1M-token context window.
- It targets long workflows, software engineering, document-heavy office tasks, scientific research, and agentic reasoning.
- Benchmarks show strong performance in coding, debugging, agents, and reasoning, though Claude Opus 5 and GPT-5.1 still lead some charts.
- The model was compressed from about 1.5 TB to 200 GB and priced aggressively for input and output tokens.
TAKEAWAYS
- HY4 is notable for combining very large scale with practical efficiency through sparse activation and compression.
- Its biggest strengths appear in real-world developer and agent workflows rather than pure benchmark domination.
- The open-weight release under Apache 2.0 makes it especially relevant for builders who want access and flexibility.
- Competitive pricing and a huge context window make it attractive for long-document and high-volume use cases.