Tencent just quietly dropped one of the biggest open-source model releases of the year, and it's flying under the radar. Hy4 preview: 770B total parameters, 49B activated, 1M+ token context. That's more than double its predecessor Hy3's parameter count. The benchmark jumps are the real story: → Terminal Bench 2.1: 85.4, beating DeepSeek V4 Pro → DeepSWE: jumped from 28.0 to 64.3, a massive generational leap → Internal blind eval with 163 human experts across 203 real engineering tasks: Hy4…