gpt-oss-20b: What PC You Need
gpt-oss-20b needs about 16.6GB at Q4; the cheapest PC that runs it comfortably is Framework Desktop (Ryzen AI Max 385) at $1,269.
Updated
What gpt-oss-20b asks of a PC
gpt-oss-20b is a mixture-of-experts model with 21B parameters, 3.6B of them active per token. Every expert has to stay resident, so its memory need follows the 21B figure, not the 3.6B one.
At 8K context gpt-oss-20b takes 16.6GB at Q4, 21.9GB at Q6 and 27.7GB at Q8. Stepping from Q4 to Q8 costs 11.1GB.
gpt-oss-20b was released in 2025-08.
28 tracked PCs with a verified price run gpt-oss-20b comfortably and 18 run it with limits. The cheapest comfortable option by type is laptop: ASUS ROG Flow Z13 (2025) at $2,030.99; mini PC: GMKtec EVO-X2 at $2,199.99; desktop: Framework Desktop (Ryzen AI Max 385) at $1,269; workstation: Lenovo ThinkStation P3 Ultra (RTX PRO 4500) at $2,029.99.
Memory requirements for gpt-oss-20b
| Quantization | 8K context | 32K context | 128K context |
|---|---|---|---|
| Q4 | 16.6GB | 22.6GB | 46.6GB |
| Q5 | 19.2GB | 25.2GB | 49.2GB |
| Q6 | 21.9GB | 27.9GB | 51.9GB |
| Q8 | 27.7GB | 33.7GB | 57.7GB |
- Parameters
- 21B
- Active per token
- 3.6B
- Source
- Model card
Best PC for gpt-oss-20b
Lenovo ThinkStation PGX: the highest AIPC Score among the PCs that run it comfortably, at $5,859.
Cheapest PCs that run gpt-oss-20b comfortably
| # | System | Type | AI Memory | GPU/NPU | AI Score | Price | Verified | View |
|---|---|---|---|---|---|---|---|---|
| 1 |  Framework Desktop (Ryzen AI Max 385) | Desktop | 24GB | Radeon 8050S | 26.3 | Price awaiting re-verification | Check Price at Framework → | |
| 2 | Framework Desktop | Desktop | 48GB | Radeon 8060S (40 CU) | 34.9 | Price awaiting re-verification | Check Price at Framework → | |
| 3 |  Lenovo ThinkStation P3 Ultra (RTX PRO 4500) | Workstation | 32GB | RTX PRO 4500 Blackwell | 39.5 | $2,029.99 | View Deal on Amazon → | |
| 4 |  ASUS ROG Flow Z13 (2025) | Laptop | 24GB | Radeon 8060S | 26.5 | $2,030.99 | View Deal on Amazon → | |
| 5 |  GMKtec EVO-X2 | Mini PC | 48GB | Radeon 8060S | 33.2 | $2,199.99 | View Deal on Amazon → |
Cheapest PCs that run gpt-oss-20b with limitations
| # | System | Type | AI Memory | GPU/NPU | AI Score | Price | Verified | View |
|---|---|---|---|---|---|---|---|---|
| 1 |  Minisforum UM890 Pro | Mini PC | 16GB | Radeon 780M | 17.3 | $1,015 | View Deal on Amazon → | |
| 2 |  Minisforum MS-01 Workstation | Mini PC | 16GB | Intel Iris Xe | 18.4 | $1,039 | View Deal on Amazon → | |
| 3 |  Beelink SER8 | Mini PC | 16GB | Radeon 780M | 17.5 | $1,099 | View Deal on Amazon → |