aicanrun

GPT-OSS 20B

Needs ~14.8GB of memory at MXFP4 and runs on 3 of the 99 phones we track — 3 of them smoothly.

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. ★ = recommended.

QuantDownloadMemory neededFits on
MXFP4 ★12.1 GB~14.8 GB3 of 99 phones

GPT-OSS 20B on 99 phones

At MXFP4, on each phone's largest RAM option. Tap a phone for the full report.

PhoneChip · RAMNeedsSpeedVerdict
SOnePlus 13Snapdragon 8 Elite · 24 GB14.8 / 20 GB~16.7 tokens/s✓ Runs great
SOnePlus 12Snapdragon 8 Gen 3 · 24 GB14.8 / 20 GB~16.7 tokens/s✓ Runs great
SROG Phone 9 ProSnapdragon 8 Elite · 24 GB14.8 / 20 GB~16.7 tokens/s✓ Runs great
FGalaxy S25 UltraSnapdragon 8 Elite · 16 GB14.8 / 12 GB—✕ Won't fit
FPixel 9 ProGoogle Tensor G4 · 16 GB14.8 / 12 GB—✕ Won't fit
FXiaomi 15 ProSnapdragon 8 Elite · 16 GB14.8 / 12 GB—✕ Won't fit
FXiaomi 14Snapdragon 8 Gen 3 · 16 GB14.8 / 12 GB—✕ Won't fit
FOPPO Find X8 ProDimensity 9400 · 16 GB14.8 / 12 GB—✕ Won't fit
Fvivo X200 ProDimensity 9400 · 16 GB14.8 / 12 GB—✕ Won't fit
Fvivo X100 ProDimensity 9300 · 16 GB14.8 / 12 GB—✕ Won't fit
FNothing Phone (3)Snapdragon 8s Gen 4 · 16 GB14.8 / 12 GB—✕ Won't fit
FMotorola Edge 50 UltraSnapdragon 8s Gen 3 · 16 GB14.8 / 12 GB—✕ Won't fit
FHONOR Magic7 ProSnapdragon 8 Elite · 16 GB14.8 / 12 GB—✕ Won't fit
FGalaxy S26 UltraSnapdragon 8 Elite Gen 5 · 16 GB14.8 / 12 GB—✕ Won't fit
FXiaomi 17Snapdragon 8 Elite Gen 5 · 16 GB14.8 / 12 GB—✕ Won't fit
FXiaomi 17 ProSnapdragon 8 Elite Gen 5 · 16 GB14.8 / 12 GB—✕ Won't fit
FOnePlus 15Snapdragon 8 Elite Gen 5 · 16 GB14.8 / 12 GB—✕ Won't fit
Fvivo X300 ProDimensity 9500 · 16 GB14.8 / 12 GB—✕ Won't fit
FOPPO Find X9 ProDimensity 9500 · 16 GB14.8 / 12 GB—✕ Won't fit
FPixel 10 ProGoogle Tensor G5 · 16 GB14.8 / 12 GB—✕ Won't fit
FGalaxy Z Fold7Snapdragon 8 Elite · 16 GB14.8 / 12 GB—✕ Won't fit
FMotorola Razr Ultra (2025)Snapdragon 8 Elite · 16 GB14.8 / 12 GB—✕ Won't fit
FOnePlus 13RSnapdragon 8 Gen 3 · 16 GB14.8 / 12 GB—✕ Won't fit
FOnePlus 15RSnapdragon 8 Gen 5 · 16 GB14.8 / 12 GB—✕ Won't fit
FPixel 9 Pro XLGoogle Tensor G4 · 16 GB14.8 / 12 GB—✕ Won't fit
FPixel 10 Pro XLGoogle Tensor G5 · 16 GB14.8 / 12 GB—✕ Won't fit
FMotorola Razr Ultra (2026)Snapdragon 8 Elite · 16 GB14.8 / 12 GB—✕ Won't fit
FRedMagic 11 AirSnapdragon 8 Elite · 16 GB14.8 / 12 GB—✕ Won't fit
FRedMagic 11S ProSnapdragon 8 Elite Gen 5 · 16 GB14.8 / 12 GB—✕ Won't fit
FHonor Magic8 ProSnapdragon 8 Elite Gen 5 · 16 GB14.8 / 12 GB—✕ Won't fit
FXperia 1 VIISnapdragon 8 Elite · 16 GB14.8 / 12 GB—✕ Won't fit
FXperia 1 VIIISnapdragon 8 Elite Gen 5 · 16 GB14.8 / 12 GB—✕ Won't fit
FGalaxy Z Fold8Snapdragon 8 Elite Gen 5 · 16 GB14.8 / 12 GB—✕ Won't fit
FGalaxy S25Snapdragon 8 Elite · 12 GB14.8 / 9 GB—✕ Won't fit
FGalaxy S24 UltraSnapdragon 8 Gen 3 · 12 GB14.8 / 9 GB—✕ Won't fit
FGalaxy S24Samsung Exynos 2400 · 12 GB14.8 / 9 GB—✕ Won't fit
FGalaxy S23 UltraSnapdragon 8 Gen 2 · 12 GB14.8 / 9 GB—✕ Won't fit
FGalaxy A55Exynos 1480 · 12 GB14.8 / 9 GB—✕ Won't fit
FPixel 9Google Tensor G4 · 12 GB14.8 / 9 GB—✕ Won't fit
FPixel 8 ProGoogle Tensor G3 · 12 GB14.8 / 9 GB—✕ Won't fit
FRedmi Note 13 ProSnapdragon 7s Gen 2 · 12 GB14.8 / 9 GB—✕ Won't fit
FPOCO X6 ProDimensity 8300 Ultra · 12 GB14.8 / 9 GB—✕ Won't fit
FNothing Phone (2a)Dimensity 7200 Pro · 12 GB14.8 / 9 GB—✕ Won't fit
FGalaxy S26Snapdragon 8 Elite Gen 5 · 12 GB14.8 / 9 GB—✕ Won't fit
FGalaxy S26+Snapdragon 8 Elite Gen 5 · 12 GB14.8 / 9 GB—✕ Won't fit
FPixel 10Google Tensor G5 · 12 GB14.8 / 9 GB—✕ Won't fit
FNothing Phone (3a)Snapdragon 7s Gen 3 · 12 GB14.8 / 9 GB—✕ Won't fit
FGalaxy A36 5GSnapdragon 6 Gen 3 · 12 GB14.8 / 9 GB—✕ Won't fit
FGalaxy A56 5GExynos 1580 · 12 GB14.8 / 9 GB—✕ Won't fit
FGalaxy Z Fold6Snapdragon 8 Gen 3 · 12 GB14.8 / 9 GB—✕ Won't fit
FGalaxy Z Flip6Snapdragon 8 Gen 3 · 12 GB14.8 / 9 GB—✕ Won't fit
FGalaxy Z Flip7Exynos 2500 · 12 GB14.8 / 9 GB—✕ Won't fit
FGalaxy A57 5GExynos 1680 · 12 GB14.8 / 9 GB—✕ Won't fit
FGalaxy A37 5GExynos 1480 · 12 GB14.8 / 9 GB—✕ Won't fit
FMotorola Razr+ (2026)Snapdragon 8s Gen 3 · 12 GB14.8 / 9 GB—✕ Won't fit
FNothing Phone (4a) ProSnapdragon 7 Gen 4 · 12 GB14.8 / 9 GB—✕ Won't fit
FRedmi Note 14 Pro 5GDimensity 7300 · 12 GB14.8 / 9 GB—✕ Won't fit
FRedmi Note 15 Pro 5GDimensity 7400 Ultra · 12 GB14.8 / 9 GB—✕ Won't fit
FRedmi Note 15 5GSnapdragon 6 Gen 3 · 12 GB14.8 / 9 GB—✕ Won't fit
FRedmi Note 14 Pro+ 5GSnapdragon 7s Gen 3 · 12 GB14.8 / 9 GB—✕ Won't fit
FRedmi Note 15 Pro+ 5GSnapdragon 7s Gen 4 · 12 GB14.8 / 9 GB—✕ Won't fit
FXiaomi 15TDimensity 8400 Ultra · 12 GB14.8 / 9 GB—✕ Won't fit
FXiaomi 15T ProDimensity 9400+ · 12 GB14.8 / 9 GB—✕ Won't fit
FPOCO X7 ProDimensity 8400 Ultra · 12 GB14.8 / 9 GB—✕ Won't fit
FHonor 400Snapdragon 7 Gen 3 · 12 GB14.8 / 9 GB—✕ Won't fit
FAQUOS R10Snapdragon 7+ Gen 3 · 12 GB14.8 / 9 GB—✕ Won't fit
FGalaxy Z Flip8Snapdragon 8 Elite Gen 5 · 12 GB14.8 / 9 GB—✕ Won't fit
FiPhone AirApple A19 Pro · 12 GB14.8 / 7.8 GB—✕ Won't fit
FiPhone 17 ProApple A19 Pro · 12 GB14.8 / 7.8 GB—✕ Won't fit
FiPhone 17 Pro MaxApple A19 Pro · 12 GB14.8 / 7.8 GB—✕ Won't fit
FiPhone 16 Pro MaxApple A18 Pro · 8 GB14.8 / 5.2 GB—✕ Won't fit
FiPhone 16 ProApple A18 Pro · 8 GB14.8 / 5.2 GB—✕ Won't fit
FiPhone 16Apple A18 · 8 GB14.8 / 5.2 GB—✕ Won't fit
FiPhone 15 ProApple A17 Pro · 8 GB14.8 / 5.2 GB—✕ Won't fit
FiPhone 15Apple A16 Bionic · 6 GB14.8 / 3.9 GB—✕ Won't fit
FiPhone 14Apple A15 Bionic · 6 GB14.8 / 3.9 GB—✕ Won't fit
FPixel 8aGoogle Tensor G3 · 8 GB14.8 / 6 GB—✕ Won't fit
FiPhone 17Apple A19 · 8 GB14.8 / 5.2 GB—✕ Won't fit
FiPhone 16eApple A18 · 8 GB14.8 / 5.2 GB—✕ Won't fit
FPixel 9aGoogle Tensor G4 · 8 GB14.8 / 6 GB—✕ Won't fit
FGalaxy S25 FESamsung Exynos 2400 · 8 GB14.8 / 6 GB—✕ Won't fit
FGalaxy A16 5GExynos 1330 · 8 GB14.8 / 6 GB—✕ Won't fit
FGalaxy A17 5GExynos 1330 · 8 GB14.8 / 6 GB—✕ Won't fit
FGalaxy A26 5GExynos 1380 · 8 GB14.8 / 6 GB—✕ Won't fit
FMoto G (2025)Dimensity 6300 · 8 GB14.8 / 6 GB—✕ Won't fit
FMoto G Power (2025)Dimensity 6300 · 8 GB14.8 / 6 GB—✕ Won't fit
FMoto G Stylus (2025)Snapdragon 6 Gen 3 · 8 GB14.8 / 6 GB—✕ Won't fit
FMoto G (2026)Dimensity 6300 · 4 GB14.8 / 2 GB—✕ Won't fit
FMoto G Power (2026)Dimensity 6300 · 8 GB14.8 / 6 GB—✕ Won't fit
FMoto G Stylus (2026)Snapdragon 6 Gen 3 · 8 GB14.8 / 6 GB—✕ Won't fit
FMotorola Razr (2025)Dimensity 7400X · 8 GB14.8 / 6 GB—✕ Won't fit
FiPhone 17eApple A19 · 8 GB14.8 / 5.2 GB—✕ Won't fit
FPixel 10aGoogle Tensor G4 · 8 GB14.8 / 6 GB—✕ Won't fit
FMotorola Razr (2026)Dimensity 7450X · 8 GB14.8 / 6 GB—✕ Won't fit
FMotorola Edge (2026)Dimensity 7450 · 8 GB14.8 / 6 GB—✕ Won't fit
FCMF Phone 2 ProDimensity 7300 · 8 GB14.8 / 6 GB—✕ Won't fit
FAQUOS sense10Snapdragon 7s Gen 3 · 8 GB14.8 / 6 GB—✕ Won't fit
FAQUOS sense9Snapdragon 7s Gen 2 · 8 GB14.8 / 6 GB—✕ Won't fit
FXperia 10 VIISnapdragon 6 Gen 3 · 8 GB14.8 / 6 GB—✕ Won't fit

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

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?

3 of the 99 phones we track fit it at MXFP4; 3 run it smoothly. The rest fall short on usable RAM.

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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