Verdict first: Qwen3.8-Flash-Next is Alibaba's new ultra-sparse mixture-of-experts model — 125B parameters in the main model with only 6B active per token, plus a 51B-parameter N-gram embedding table — released on August 26, 2026 as a public preview of the architecture Qwen4 will be built on. Against the dense Qwen3.8-27B, Flash-Next wins on long-context throughput and agentic workload economics; the 27B dense model still wins on simple single-GPU deployment. If you run agents over large docu...