Tencent Releases Hy4 Preview AI Model, Open and Free
Tencent positions Hy4 preview as a state-of-the-art open model that beats GPT-5.6 Sol on specific agent and coding tests, while also releasing a quantized 1-bit version that runs on far less VRAM.
Reporting from 1 source: GIGAZINE.
Tencent released the AI model Hy4 preview on August 28, 2026. It is an open model with 770 billion total parameters, 490 billion active parameters, and a 1 million token context length. It surpasses GPT-5.6 Sol on some benchmarks and is free under Apache License 2.0.
Tencent's Hy4 preview arrives as an open model with a 770 billion parameter MoE architecture, of which 490 billion are active per token. The model handles up to 1 million tokens of context and is licensed under Apache License 2.0, so it can be downloaded and used freely.
On benchmarks, Hy4 preview outperforms GPT-5.6 Sol in SWE Atlas Refactoring and SWE-bench Pro, which measure agent and coding performance. Tencent also released quantized versions: the Q4_K_M runs with 435GiB of VRAM, while the STQ1_0 version needs only 214GiB, using a 1.31-bit quantization method that keeps performance loss small relative to the size reduction.
Synthesized by Yomimono from the 1 cited source below, including Japanese-language reporting where cited, then editorially reviewed before publishing.