Qwen3.8 125B (6B active) Flash-Next

User reports Qwen3.8 Flash Next Q4 running through ds4 on an M3 Ultra 96GB with the full 262K context configured, delivering 55–60 tok/s decode and 667 tok/s prefill. About 80GB is used for model, KV cache and buffers, while the model's 95GB n-gram table streams from SSD. The user runs it daily through a codex harness as a headless box.