GLM-5.3 320B (18B active) Flash

User reports GLM-5.3-Flash (320B) at ~61 tok/s generation on an M5 Ultra Mac Studio with 256GB unified memory. Setup is llama.cpp with GLM's built-in MTP head (probabilistic drafting, 3 draft tokens); without MTP generation is 39.7 tok/s. The full 262K context fits with ~15 GiB to spare. Prompt reading is ~765 tok/s at 4K tokens and ~630 tok/s at 59K; a 29K-token prompt takes 45 s. Long-context recall was correct at 58.8K tokens. Images and MTP cannot be enabled simultaneously, and deep context on Metal needs an unmerged fix.