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

User reports Qwen3.8-Flash-Next at 100.2 tok/s on an M5 Ultra Mac Studio with 256GB unified memory. Setup is llama.cpp b11538 with IQ4_NL weights, f16 KV cache, 262K context, and MTP speculative decoding with probabilistic drafting at n-max 5. Without speculation the model decodes at 57.0 tok/s; prompt processing reaches 2150 tok/s with ubatch 4096. The full 262K context fits with about 103 GB of GPU memory free. A second copy of the model loaded by another app caused swapping and dropped speed to 12 tok/s.