aicanrun

GPT-OSS 20B

At the default MXFP4, 4 of 140 phones have enough estimated usable memory; 4 also reach 3+ tokens/s. On Mac, 46 of 54 exact configurations pass using that quant or a smaller tracked fallback.

Params
21B (3.6B active)
Family
gpt-oss
Released
2025-08
Tags
chat · reasoning
Weights
gpt-oss-20b-GGUF ↗

Downloads & memory by quant

The download is only the weights — add KV cache and runtime to get what your phone actually needs. “Memory-fit” only means it can load; “usable” also requires an estimated 3+ tokens/s. Each row uses that row's quant. ★ = recommended.

QuantDownloadMemory neededPhone reality
MXFP4 ★12.1 GB~14.8 GB4 memory-fit · 4 usable

GPT-OSS 20B at MXFP4 on 140 phones

This table is fixed to the recommended MXFP4, on each phone's largest RAM option. Counts for smaller quants above will differ. All phones are shown, sorted by fit and estimated experience; tap one for the full report.

PhoneChip · RAMNeedsSpeedVerdict
OnePlus 13Snapdragon 8 Elite · 24 GB14.8 / 20 GB~16.7 tokens/s✓ Runs great
OnePlus 12Snapdragon 8 Gen 3 · 24 GB14.8 / 20 GB~16.7 tokens/s✓ Runs great
ROG Phone 9 ProSnapdragon 8 Elite · 24 GB14.8 / 20 GB~16.7 tokens/s✓ Runs great
Huawei Mate X7Kirin 9030 Pro · 20 GB14.8 / 16 GB~16.7 tokens/s✓ Runs great
Galaxy S25 UltraSnapdragon 8 Elite · 16 GB14.8 / 12 GB—✕ Won't fit
Pixel 9 ProGoogle Tensor G4 · 16 GB14.8 / 12 GB—✕ Won't fit
Xiaomi 15 ProSnapdragon 8 Elite · 16 GB14.8 / 12 GB—✕ Won't fit
Xiaomi 14Snapdragon 8 Gen 3 · 16 GB14.8 / 12 GB—✕ Won't fit
OPPO Find X8 ProDimensity 9400 · 16 GB14.8 / 12 GB—✕ Won't fit
vivo X200 ProDimensity 9400 · 16 GB14.8 / 12 GB—✕ Won't fit
vivo X100 ProDimensity 9300 · 16 GB14.8 / 12 GB—✕ Won't fit
Nothing Phone (3)Snapdragon 8s Gen 4 · 16 GB14.8 / 12 GB—✕ Won't fit
Motorola Edge 50 UltraSnapdragon 8s Gen 3 · 16 GB14.8 / 12 GB—✕ Won't fit
HONOR Magic7 ProSnapdragon 8 Elite · 16 GB14.8 / 12 GB—✕ Won't fit
Galaxy S26 UltraSnapdragon 8 Elite Gen 5 · 16 GB14.8 / 12 GB—✕ Won't fit
Xiaomi 17Snapdragon 8 Elite Gen 5 · 16 GB14.8 / 12 GB—✕ Won't fit
Xiaomi 17 ProSnapdragon 8 Elite Gen 5 · 16 GB14.8 / 12 GB—✕ Won't fit
OnePlus 15Snapdragon 8 Elite Gen 5 · 16 GB14.8 / 12 GB—✕ Won't fit
vivo X300 ProDimensity 9500 · 16 GB14.8 / 12 GB—✕ Won't fit
OPPO Find X9 ProDimensity 9500 · 16 GB14.8 / 12 GB—✕ Won't fit
Pixel 10 ProGoogle Tensor G5 · 16 GB14.8 / 12 GB—✕ Won't fit
Pixel 11 ProGoogle Tensor G6 · 16 GB14.8 / 12 GB—✕ Won't fit
Pixel 11 Pro XLGoogle Tensor G6 · 16 GB14.8 / 12 GB—✕ Won't fit
Galaxy Z Fold7Snapdragon 8 Elite · 16 GB14.8 / 12 GB—✕ Won't fit
Motorola Razr Ultra (2025)Snapdragon 8 Elite · 16 GB14.8 / 12 GB—✕ Won't fit
OnePlus 13RSnapdragon 8 Gen 3 · 16 GB14.8 / 12 GB—✕ Won't fit
OnePlus 15RSnapdragon 8 Gen 5 · 16 GB14.8 / 12 GB—✕ Won't fit
Pixel 9 Pro XLGoogle Tensor G4 · 16 GB14.8 / 12 GB—✕ Won't fit
Pixel 10 Pro XLGoogle Tensor G5 · 16 GB14.8 / 12 GB—✕ Won't fit
Motorola Razr Ultra (2026)Snapdragon 8 Elite · 16 GB14.8 / 12 GB—✕ Won't fit
RedMagic 11 AirSnapdragon 8 Elite · 16 GB14.8 / 12 GB—✕ Won't fit
RedMagic 11S ProSnapdragon 8 Elite Gen 5 · 16 GB14.8 / 12 GB—✕ Won't fit
Honor Magic8 ProSnapdragon 8 Elite Gen 5 · 16 GB14.8 / 12 GB—✕ Won't fit
Xperia 1 VIISnapdragon 8 Elite · 16 GB14.8 / 12 GB—✕ Won't fit
Xperia 1 VIIISnapdragon 8 Elite Gen 5 · 16 GB14.8 / 12 GB—✕ Won't fit
Galaxy Z Fold8Snapdragon 8 Elite Gen 5 · 16 GB14.8 / 12 GB—✕ Won't fit
Galaxy Z Fold8 UltraSnapdragon 8 Elite Gen 5 · 16 GB14.8 / 12 GB—✕ Won't fit
Xiaomi MIX Fold 3Snapdragon 8 Gen 2 · 16 GB14.8 / 12 GB—✕ Won't fit
Xiaomi MIX Fold 4Snapdragon 8 Gen 3 · 16 GB14.8 / 12 GB—✕ Won't fit
Xiaomi MIX FlipSnapdragon 8 Gen 3 · 16 GB14.8 / 12 GB—✕ Won't fit
Xiaomi MIX Flip 2Snapdragon 8 Elite · 16 GB14.8 / 12 GB—✕ Won't fit
Honor Magic V2Snapdragon 8 Gen 2 · 16 GB14.8 / 12 GB—✕ Won't fit
Honor Magic V3Snapdragon 8 Gen 3 · 16 GB14.8 / 12 GB—✕ Won't fit
Honor Magic V5Snapdragon 8 Elite · 16 GB14.8 / 12 GB—✕ Won't fit
Honor Magic V6Snapdragon 8 Elite Gen 5 · 16 GB14.8 / 12 GB—✕ Won't fit
HONOR Robot PhoneSnapdragon 8 Elite Gen 5 · 16 GB14.8 / 12 GB—✕ Won't fit
OPPO Find N3Snapdragon 8 Gen 2 · 16 GB14.8 / 12 GB—✕ Won't fit
OnePlus OpenSnapdragon 8 Gen 2 · 16 GB14.8 / 12 GB—✕ Won't fit
OPPO Find N5Snapdragon 8 Elite · 16 GB14.8 / 12 GB—✕ Won't fit
OPPO Find N6Snapdragon 8 Elite Gen 5 · 16 GB14.8 / 12 GB—✕ Won't fit
vivo X Fold3Snapdragon 8 Gen 2 · 16 GB14.8 / 12 GB—✕ Won't fit
vivo X Fold3 ProSnapdragon 8 Gen 3 · 16 GB14.8 / 12 GB—✕ Won't fit
vivo X Fold5Snapdragon 8 Gen 3 · 16 GB14.8 / 12 GB—✕ Won't fit
vivo X Fold6Dimensity 9500 · 16 GB14.8 / 12 GB—✕ Won't fit
Pixel 9 Pro FoldGoogle Tensor G4 · 16 GB14.8 / 12 GB—✕ Won't fit
Pixel 10 Pro FoldGoogle Tensor G5 · 16 GB14.8 / 12 GB—✕ Won't fit
Pixel 11 Pro FoldGoogle Tensor G6 · 16 GB14.8 / 12 GB—✕ Won't fit
Huawei Mate X6Kirin 9020 · 16 GB14.8 / 12 GB—✕ Won't fit
Motorola Razr FoldSnapdragon 8 Gen 5 · 16 GB14.8 / 12 GB—✕ Won't fit
Galaxy S25Snapdragon 8 Elite · 12 GB14.8 / 9 GB—✕ Won't fit
Galaxy S24 UltraSnapdragon 8 Gen 3 · 12 GB14.8 / 9 GB—✕ Won't fit
Galaxy S24Samsung Exynos 2400 · 12 GB14.8 / 9 GB—✕ Won't fit
Galaxy S23 UltraSnapdragon 8 Gen 2 · 12 GB14.8 / 9 GB—✕ Won't fit
Galaxy A55Exynos 1480 · 12 GB14.8 / 9 GB—✕ Won't fit
Pixel 9Google Tensor G4 · 12 GB14.8 / 9 GB—✕ Won't fit
Pixel 8 ProGoogle Tensor G3 · 12 GB14.8 / 9 GB—✕ Won't fit
Redmi Note 13 ProSnapdragon 7s Gen 2 · 12 GB14.8 / 9 GB—✕ Won't fit
POCO X6 ProDimensity 8300 Ultra · 12 GB14.8 / 9 GB—✕ Won't fit
Nothing Phone (2a)Dimensity 7200 Pro · 12 GB14.8 / 9 GB—✕ Won't fit
Galaxy S26Snapdragon 8 Elite Gen 5 · 12 GB14.8 / 9 GB—✕ Won't fit
Galaxy S26+Snapdragon 8 Elite Gen 5 · 12 GB14.8 / 9 GB—✕ Won't fit
vivo X300 ESnapdragon 8 Gen 5 · 12 GB14.8 / 9 GB—✕ Won't fit
Pixel 10Google Tensor G5 · 12 GB14.8 / 9 GB—✕ Won't fit
Pixel 11Google Tensor G6 · 12 GB14.8 / 9 GB—✕ Won't fit
Nothing Phone (3a)Snapdragon 7s Gen 3 · 12 GB14.8 / 9 GB—✕ Won't fit
Galaxy A36 5GSnapdragon 6 Gen 3 · 12 GB14.8 / 9 GB—✕ Won't fit
Galaxy A56 5GExynos 1580 · 12 GB14.8 / 9 GB—✕ Won't fit
Galaxy Z Fold6Snapdragon 8 Gen 3 · 12 GB14.8 / 9 GB—✕ Won't fit
Galaxy Z Flip6Snapdragon 8 Gen 3 · 12 GB14.8 / 9 GB—✕ Won't fit
Galaxy Z Flip7Exynos 2500 · 12 GB14.8 / 9 GB—✕ Won't fit
Galaxy A57 5GExynos 1680 · 12 GB14.8 / 9 GB—✕ Won't fit
Galaxy A37 5GExynos 1480 · 12 GB14.8 / 9 GB—✕ Won't fit
Motorola Razr+ (2026)Snapdragon 8s Gen 3 · 12 GB14.8 / 9 GB—✕ Won't fit
Nothing Phone (4a) ProSnapdragon 7 Gen 4 · 12 GB14.8 / 9 GB—✕ Won't fit
Redmi Note 14 Pro 5GDimensity 7300 · 12 GB14.8 / 9 GB—✕ Won't fit
Redmi Note 15 Pro 5GDimensity 7400 Ultra · 12 GB14.8 / 9 GB—✕ Won't fit
Redmi Note 15 5GSnapdragon 6 Gen 3 · 12 GB14.8 / 9 GB—✕ Won't fit
Redmi Note 14 Pro+ 5GSnapdragon 7s Gen 3 · 12 GB14.8 / 9 GB—✕ Won't fit
Redmi Note 15 Pro+ 5GSnapdragon 7s Gen 4 · 12 GB14.8 / 9 GB—✕ Won't fit
Xiaomi 15TDimensity 8400 Ultra · 12 GB14.8 / 9 GB—✕ Won't fit
Xiaomi 15T ProDimensity 9400+ · 12 GB14.8 / 9 GB—✕ Won't fit
POCO X7 ProDimensity 8400 Ultra · 12 GB14.8 / 9 GB—✕ Won't fit
Xiaomi MIX Fold 2Snapdragon 8+ Gen 1 · 12 GB14.8 / 9 GB—✕ Won't fit
Honor 400Snapdragon 7 Gen 3 · 12 GB14.8 / 9 GB—✕ Won't fit
AQUOS R10Snapdragon 7+ Gen 3 · 12 GB14.8 / 9 GB—✕ Won't fit
Galaxy Z Flip8Samsung Exynos 2600 · 12 GB14.8 / 9 GB—✕ Won't fit
Galaxy Z Fold5Snapdragon 8 Gen 2 · 12 GB14.8 / 9 GB—✕ Won't fit
Pixel FoldTensor G2 · 12 GB14.8 / 9 GB—✕ Won't fit
Motorola Razr+ (2023)Snapdragon 8+ Gen 1 · 12 GB14.8 / 9 GB—✕ Won't fit
Motorola Razr (2024)Dimensity 7300X · 12 GB14.8 / 9 GB—✕ Won't fit
Motorola Razr+ (2024)Snapdragon 8s Gen 3 · 12 GB14.8 / 9 GB—✕ Won't fit
Motorola Razr+ (2025)Snapdragon 8s Gen 3 · 12 GB14.8 / 9 GB—✕ Won't fit
iPhone AirApple A19 Pro · 12 GB14.8 / 7.8 GB—✕ Won't fit
iPhone 17 ProApple A19 Pro · 12 GB14.8 / 7.8 GB—✕ Won't fit
iPhone 17 Pro MaxApple A19 Pro · 12 GB14.8 / 7.8 GB—✕ Won't fit
iPhone 16 Pro MaxApple A18 Pro · 8 GB14.8 / 5.2 GB—✕ Won't fit
iPhone 16 ProApple A18 Pro · 8 GB14.8 / 5.2 GB—✕ Won't fit
iPhone 16Apple A18 · 8 GB14.8 / 5.2 GB—✕ Won't fit
iPhone 15 ProApple A17 Pro · 8 GB14.8 / 5.2 GB—✕ Won't fit
iPhone 15Apple A16 Bionic · 6 GB14.8 / 3.9 GB—✕ Won't fit
iPhone 14Apple A15 Bionic · 6 GB14.8 / 3.9 GB—✕ Won't fit
Pixel 8aGoogle Tensor G3 · 8 GB14.8 / 6 GB—✕ Won't fit
iPhone 17Apple A19 · 8 GB14.8 / 5.2 GB—✕ Won't fit
Galaxy S26 FEExynos 2500 · 8 GB14.8 / 6 GB—✕ Won't fit
iPhone 16eApple A18 · 8 GB14.8 / 5.2 GB—✕ Won't fit
Pixel 9aGoogle Tensor G4 · 8 GB14.8 / 6 GB—✕ Won't fit
Galaxy S25 FESamsung Exynos 2400 · 8 GB14.8 / 6 GB—✕ Won't fit
Galaxy A16 5GExynos 1330 · 8 GB14.8 / 6 GB—✕ Won't fit
Galaxy A17 5GExynos 1330 · 8 GB14.8 / 6 GB—✕ Won't fit
Galaxy A26 5GExynos 1380 · 8 GB14.8 / 6 GB—✕ Won't fit
Moto G (2025)Dimensity 6300 · 8 GB14.8 / 6 GB—✕ Won't fit
Moto G Power (2025)Dimensity 6300 · 8 GB14.8 / 6 GB—✕ Won't fit
Moto G Stylus (2025)Snapdragon 6 Gen 3 · 8 GB14.8 / 6 GB—✕ Won't fit
Moto G (2026)Dimensity 6300 · 4 GB14.8 / 2 GB—✕ Won't fit
Moto G Power (2026)Dimensity 6300 · 8 GB14.8 / 6 GB—✕ Won't fit
Moto G Stylus (2026)Snapdragon 6 Gen 3 · 8 GB14.8 / 6 GB—✕ Won't fit
Motorola Razr (2025)Dimensity 7400X · 8 GB14.8 / 6 GB—✕ Won't fit
iPhone 17eApple A19 · 8 GB14.8 / 5.2 GB—✕ Won't fit
Pixel 10aGoogle Tensor G4 · 8 GB14.8 / 6 GB—✕ Won't fit
Motorola Razr (2026)Dimensity 7450X · 8 GB14.8 / 6 GB—✕ Won't fit
Motorola Edge (2026)Dimensity 7450 · 8 GB14.8 / 6 GB—✕ Won't fit
CMF Phone 2 ProDimensity 7300 · 8 GB14.8 / 6 GB—✕ Won't fit
AQUOS sense10Snapdragon 7s Gen 3 · 8 GB14.8 / 6 GB—✕ Won't fit
AQUOS sense9Snapdragon 7s Gen 2 · 8 GB14.8 / 6 GB—✕ Won't fit
Xperia 10 VIISnapdragon 6 Gen 3 · 8 GB14.8 / 6 GB—✕ Won't fit
Galaxy Z Flip5Snapdragon 8 Gen 2 · 8 GB14.8 / 6 GB—✕ Won't fit
Redmi Note 17Snapdragon 4 Gen 4 · 8 GB14.8 / 6 GB—✕ Won't fit
vivo S2Dimensity 7360-Turbo · 8 GB14.8 / 6 GB—✕ Won't fit
vivo V80 Lite 5G (Pakistan)Dimensity 7360-Turbo · 8 GB14.8 / 6 GB—✕ Won't fit
iQOO Z11 LiteDimensity 6300 · 8 GB14.8 / 6 GB—✕ Won't fit

~ = bandwidth-based estimate · ✓ = measured on real hardware

GPT-OSS 20B on 54 Mac configurations

Each Mac uses the recommended MXFP4 at 4K context when it fits, or the largest smaller tracked quant that fits. Each row links to the full report with a macOS-specific setup guide.

MacUnified memoryQuantWorking budgetNeedsEstimated speedVerdict
Mac Studio M5 Ultra512 GBMXFP4504 GB15 GB~289.3–405 tokens/s✓ Runs great
Mac Studio M3 Ultra512 GBMXFP4504 GB15 GB~197.4–276.4 tokens/s✓ Runs great
Mac Studio M5 Ultra256 GBMXFP4248 GB15 GB~289.3–405 tokens/s✓ Runs great
Mac Studio M3 Ultra256 GBMXFP4248 GB15 GB~197.4–276.4 tokens/s✓ Runs great
Mac Studio M5 Max128 GBMXFP4120 GB15 GB~148–207.2 tokens/s✓ Runs great
MacBook Pro M5 Max128 GBMXFP4120 GB15 GB~148–207.2 tokens/s✓ Runs great
Mac Studio M4 Max128 GBMXFP4120 GB15 GB~131.6–184.3 tokens/s✓ Runs great
MacBook Pro M4 Max128 GBMXFP4120 GB15 GB~131.6–184.3 tokens/s✓ Runs great
MacBook Pro M3 Max128 GBMXFP4120 GB15 GB~96.4–135 tokens/s✓ Runs great
Mac Studio M5 Ultra96 GBMXFP488 GB15 GB~289.3–405 tokens/s✓ Runs great
Mac Studio M3 Ultra96 GBMXFP488 GB15 GB~197.4–276.4 tokens/s✓ Runs great
Mac mini M5 Pro64 GBMXFP457.6 GB15 GB~74–103.6 tokens/s✓ Runs great
Mac Studio M5 Max64 GBMXFP457.6 GB15 GB~148–207.2 tokens/s✓ Runs great
MacBook Pro M5 Pro64 GBMXFP457.6 GB15 GB~74–103.6 tokens/s✓ Runs great
MacBook Pro M5 Max64 GBMXFP457.6 GB15 GB~148–207.2 tokens/s✓ Runs great
Mac Studio M4 Max64 GBMXFP457.6 GB15 GB~131.6–184.3 tokens/s✓ Runs great
Mac mini M4 Pro64 GBMXFP457.6 GB15 GB~65.8–92.1 tokens/s✓ Runs great
MacBook Pro M4 Max64 GBMXFP457.6 GB15 GB~131.6–184.3 tokens/s✓ Runs great
MacBook Pro M3 Max64 GBMXFP457.6 GB15 GB~96.4–135 tokens/s✓ Runs great
Mac mini M5 Pro48 GBMXFP443.2 GB15 GB~74–103.6 tokens/s✓ Runs great
Mac Studio M5 Max48 GBMXFP443.2 GB15 GB~148–207.2 tokens/s✓ Runs great
MacBook Pro M5 Pro48 GBMXFP443.2 GB15 GB~74–103.6 tokens/s✓ Runs great
Mac Studio M4 Max48 GBMXFP443.2 GB15 GB~131.6–184.3 tokens/s✓ Runs great
Mac mini M4 Pro48 GBMXFP443.2 GB15 GB~65.8–92.1 tokens/s✓ Runs great
MacBook Pro M4 Pro48 GBMXFP443.2 GB15 GB~65.8–92.1 tokens/s✓ Runs great
Mac Studio M5 Max36 GBMXFP432.4 GB15 GB~110.9–155.2 tokens/s✓ Runs great
MacBook Pro M5 Max36 GBMXFP432.4 GB15 GB~110.9–155.2 tokens/s✓ Runs great
Mac Studio M4 Max36 GBMXFP432.4 GB15 GB~98.8–138.4 tokens/s✓ Runs great
MacBook Pro M4 Max36 GBMXFP432.4 GB15 GB~98.8–138.4 tokens/s✓ Runs great
MacBook Pro M3 Pro36 GBMXFP432.4 GB15 GB~36.2–50.6 tokens/s✓ Runs great
MacBook Pro M3 Max36 GBMXFP432.4 GB15 GB~72.3–101.2 tokens/s✓ Runs great
Mac mini M632 GBMXFP428.8 GB15 GB~41–57.4 tokens/s✓ Runs great
Mac mini M5 Pro32 GBMXFP428.8 GB15 GB~74–103.6 tokens/s✓ Runs great
MacBook Air M532 GBMXFP428.8 GB15 GB~31–42.8 tokens/s✓ Runs great
MacBook Air M432 GBMXFP428.8 GB15 GB~24.3–33.6 tokens/s✓ Runs great
Mac mini M432 GBMXFP428.8 GB15 GB~28.9–40.5 tokens/s✓ Runs great
Mac mini M624 GBMXFP421 GB15 GB~41–57.4 tokens/s✓ Runs great
Mac mini M5 Pro24 GBMXFP421 GB15 GB~74–103.6 tokens/s✓ Runs great
MacBook Air M524 GBMXFP421 GB15 GB~31–42.8 tokens/s✓ Runs great
MacBook Pro M5 Pro24 GBMXFP421 GB15 GB~74–103.6 tokens/s✓ Runs great
MacBook Air M424 GBMXFP421 GB15 GB~24.3–33.6 tokens/s✓ Runs great
Mac mini M424 GBMXFP421 GB15 GB~28.9–40.5 tokens/s✓ Runs great
Mac mini M4 Pro24 GBMXFP421 GB15 GB~65.8–92.1 tokens/s✓ Runs great
MacBook Air M324 GBMXFP421 GB15 GB~20.2–28 tokens/s✓ Runs great
MacBook Pro M4 Pro24 GBMXFP421 GB15 GB~65.8–92.1 tokens/s✓ Runs great
MacBook Pro M3 Pro18 GBMXFP415 GB15 GB~36.2–50.6 tokens/s! Runs, barely
Mac mini M616 GBMXFP413 GB15 GB—✕ Won't fit
MacBook Air M516 GBMXFP413 GB15 GB—✕ Won't fit
MacBook Air M416 GBMXFP413 GB15 GB—✕ Won't fit
Mac mini M416 GBMXFP413 GB15 GB—✕ Won't fit
MacBook Air M316 GBMXFP413 GB15 GB—✕ Won't fit
MacBook Air M116 GBMXFP413 GB15 GB—✕ Won't fit
MacBook Neo A18 Pro8 GBMXFP45 GB15 GB—✕ Won't fit
MacBook Air M18 GBMXFP45 GB15 GB—✕ Won't fit

FAQ

How much RAM do I need to run GPT-OSS 20B on a phone?

At MXFP4, GPT-OSS 20B needs ~14.8GB of usable memory (weights + KV cache + runtime). In practice that means a 24GB+ Android phone or a 24GB+ iPhone — iOS lets a single app use less of its RAM than Android does.

How fast does GPT-OSS 20B run on a flagship phone?

On the OnePlus 13 (Snapdragon 8 Elite) it runs at ~16.7 tokens/s at MXFP4, estimated from memory bandwidth. Anything above ~8 tokens/s feels smooth for chat.

Can an iPhone run GPT-OSS 20B?

Not really: the best iPhone we track (iPhone Air) has ~7.8GB usable, but GPT-OSS 20B needs 14.8GB at MXFP4.

What is the best quantization of GPT-OSS 20B for mobile?

MXFP4 (12.1GB download) is the size/quality sweet spot. Total memory needed is ~14.8GB once the KV cache and runtime are counted — the download size alone understates it.

How many phones can run GPT-OSS 20B?

4 of the 140 phones we track have enough estimated usable memory at MXFP4; 4 also reach our usable-speed threshold of 3 tokens/s, and 4 run smoothly. Memory-fit alone does not mean a good experience.

Which Macs can run GPT-OSS 20B?

46 of the 54 exact Mac configurations we track have enough estimated working memory. Each Mac uses the recommended MXFP4 when it fits, or the largest smaller tracked quant that fits, and separates installed unified memory, the macOS reserve, and estimated speed.

What is GPT-OSS 20B good for on a phone?

It's tagged for chat, reasoning. At 21B parameters (3.6B active — it's a MoE, so it decodes faster than its size suggests), it prioritizes answer quality over speed — expect slower decoding.

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