OpenAI
MLX Community

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

<- Runs

Prompt tokens

40,960

Generation tokens

10,240

Trials passed

10/10

Verified

114.9 tok/s

4,184.3 tok/s

Peak memory

14.00/64 GB

Runs great

Trials

Decode / Prefill Speeds

Metadata

metadata.json
{
"runId": "run_560ee824-30da-4143-9b0a-d7fad3196b9d",
"bundleId": "mlx-gpt-oss-20b-mxfp4-q8-75dbdf",
"status": "verified",
"promptTokens": 40960,
"completionTokens": 10240,
"contextLength": 5120,
"harness": {
"version": "0.1.21",
"gitSha": "unknown"
},
"runtime": {
"name": "mlx_lm",
"version": "0.31.2",
"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 Max",
"cpuCores": 18,
"gpu": "Apple M5 Max",
"gpuCores": 40,
"gpuCount": 1,
"ramGb": 64,
"osName": "macOS",
"osVersion": "26.3.2"
},
"decodeTpsMean": 114.9,
"prefillTpsMean": 4184.3,
"ttftP50Ms": 1036.04,
"idleTpsMean": 3413,
"peakRssMb": 14336,
"trialsPassed": 10,
"trialsTotal": 10,
"runnabilityScore": 0.90625,
"bundleSha256": "87aeb2d21436e67763f4df868ef36ada26fac2bd1489a06a12cc300dbd708c5f",
"createdAt": "2026-04-18T06:32:35.179Z"
}