OpenAI
MLX Community

gpt-oss-20b benchmark on an Apple's logo.M5 Pro · 64 GB

<- Runs

Prompt tokens

40,960

Generation tokens

10,240

Trials passed

10/10

Verified

79.7 tok/s

2,884.9 tok/s

Peak memory

13.00/64 GB

Runs great

Trials

Decode / Prefill Speeds

Metadata

metadata.json
{
"runId": "run_d4a09a8b-e5e6-41c7-bff6-ab21fd8579c2",
"bundleId": "mlx-gpt-oss-20b-mxfp4-q8-285db7",
"status": "verified",
"promptTokens": 40960,
"completionTokens": 10240,
"contextLength": 5120,
"harness": {
"version": "0.1.22",
"gitSha": "ff1d570"
},
"runtime": {
"name": "mlx_lm",
"version": "0.31.3",
"buildFlags": null
},
"model": {
"displayName": "gpt-oss-20b",
"format": "mlx",
"quant": "mxfp4",
"architecture": "gpt_oss",
"source": "mlx-community/gpt-oss-20b-MXFP4-Q8",
"fileSizeBytes": 12076207568,
"lab": {
"name": "OpenAI",
"slug": "openai"
},
"quantizedBy": {
"name": "MLX Community",
"slug": "mlx-community"
}
},
"device": {
"cpu": "Apple M5 Pro",
"cpuCores": 18,
"gpu": "Apple M5 Pro",
"gpuCores": 20,
"gpuCount": 1,
"ramGb": 64,
"osName": "macOS",
"osVersion": "26.4.1"
},
"decodeTpsMean": 79.7,
"prefillTpsMean": 2884.9,
"ttftP50Ms": 1402.56,
"idleTpsMean": 626,
"peakRssMb": 13312,
"trialsPassed": 10,
"trialsTotal": 10,
"runnabilityScore": 0.8546189285714286,
"bundleSha256": "6861f38f3b84148a8037bf62e175c91fccecc98fc2fee6c373cbdf5e2247508b",
"createdAt": "2026-04-27T02:32:47.610Z"
}