OpenAI
OpenAI

gpt-oss-20b benchmark on an Apple's logo.M4 Max · 128 GB

<- Runs

Prompt tokens

40,960

Generation tokens

10,240

Trials passed

10/10

Verified

91.3 tok/s

1,307.2 tok/s

Peak memory

18.00/128 GB

Runs well

Trials

Decode / Prefill Speeds

Metadata

metadata.json
{
"runId": "run_a1fc0605-6359-4a13-882a-0b2eee267c20",
"bundleId": "mlx-gpt-oss-20b-df6376",
"status": "verified",
"promptTokens": 40960,
"completionTokens": 10240,
"contextLength": 5120,
"harness": {
"version": "0.1.18",
"gitSha": "c60e6d1"
},
"runtime": {
"name": "mlx_lm",
"version": "0.31.2",
"buildFlags": null
},
"model": {
"displayName": "gpt-oss-20b",
"format": "mlx",
"quant": "4bit",
"architecture": "gpt_oss",
"source": "openai/gpt-oss-20b",
"fileSizeBytes": 13761316904,
"lab": {
"name": "OpenAI",
"slug": "openai"
},
"quantizedBy": {
"name": "OpenAI",
"slug": "openai"
}
},
"device": {
"cpu": "Apple M4 Max",
"cpuCores": 16,
"gpu": "Apple M4 Max",
"gpuCores": 40,
"gpuCount": 1,
"ramGb": 128,
"osName": "macOS",
"osVersion": "26.4.1"
},
"decodeTpsMean": 91.3,
"prefillTpsMean": 1307.2,
"ttftP50Ms": 3153.42,
"idleTpsMean": 4164,
"peakRssMb": 18432,
"trialsPassed": 10,
"trialsTotal": 10,
"runnabilityScore": 0.842042142857143,
"bundleSha256": "673ad9ce5a166cfc9f0d6726be283f47c158f549c1fe96b5b60edc8b00068768",
"createdAt": "2026-04-24T19:35:12.581Z"
}