gpt-oss 21B (3.6B active)
M4 Pro 64GB · llama.cpp b6280 / 0fd90db / Metal
- generation:
- 63.3 tokens/s
- prompt processing (prefill):
- 700.8 tokens/s
- quant:
- MXFP4 (GGUF)
- flash attention:
- on
- mtp (multi-token prediction):
- off
User reports gpt-oss 20B MXFP4 at 63.3 t/s generation and 700.8 t/s prompt processing on a Mac mini M4 Pro with 64 GB unified memory. Setup is llama.cpp build 6280 with MXFP4 GGUF, F16 K/V cache, flash attention, one Metal device, and -ngl 99. The 63.3 t/s is a separate TG128 depth-zero test, not generation after the four large prompts; prompt rates fall from 700.78 t/s at 2048 tokens to 419.74 t/s at 32768.