Can an M3 Ultra run gpt-oss-20b?
llm-speed has not measured gpt-oss-20b on M3 Ultra itself yet, so there is no llm-speed verdict. 1 community-submitted run exists (fastest 152.7 tok/s at Q4 on mlx); community-submitted, not measured by llm-speed, so it gives no verdict.
1 signed run on llm-speed. Single-request decode speed in tokens per second; the short-chat workload unless noted. This run is community-submitted (signed on the submitter's own machine, not measured by llm-speed, and not used for llm-speed verdicts). Verdicts and headline numbers use only llm-speed's own runs and fit tests.
Measured tok/s by quant and runtime
| Quant | Runtime | Build | Decode tok/s (best run) | Workload | Runs | Source |
|---|---|---|---|---|---|---|
| Q4 | mlx | 0.31.3 | 152.7 | chat-short | 1 | Community-submitted |
llm-speed has not measured this pair itself, so there is no llm-speed verdict or fastest quant. The rows above are community-submitted, not measured by llm-speed.
VRAM: not recorded for these runs. The VRAM calculator gives an estimate (predicted, not measured).
Every measured row
| Run | Date (UTC) | Workload | Quant | Runtime / build | Prompt tokens | Output tokens | Decode tok/s | Prefill tok/s | TTFT ms | VRAM GiB | Source |
|---|---|---|---|---|---|---|---|---|---|---|---|
| r_3ijun8ltjnb | 2026-04-28 | chat-short | Q4 | mlx · 0.31.3 | 166 | 256 | 152.7 | 239.9 | 692 | – | Community-submitted |
Questions
Can an M3 Ultra run gpt-oss-20b?
llm-speed has not measured gpt-oss-20b on M3 Ultra itself yet, so there is no llm-speed verdict. 1 community-submitted run exists (fastest 152.7 tok/s at Q4 on mlx); community-submitted, not measured by llm-speed, so it gives no verdict.
What did community runs measure for gpt-oss-20b on an M3 Ultra?
1 community-submitted run (community-submitted, not measured by llm-speed): Q4 on mlx: 152.7 tok/s. They are listed for reference and give no llm-speed verdict.