Tencent Hy4 preview: 770B parameters, 49B active and a 1M context. Benchmarks, pricing and comparison with Kimi K3, GLM-5.3 and Claude Opus 5
Verified analysis of Tencent Hy4 preview: 770B/49B MoE architecture, 1M context, Gated DSA, IndexCache, MTP, Apache 2.0, benchmarks, internal blind test, API pricing, self-hosting, FP8, vLLM/SGLang and preview limitations.

