Cheapest box to run gpt-oss-120b at Q6_K
OpenAI’s gpt-oss-120b is 117B parameters, 5.1B of them read per token. The number below is computed from that and each vendor’s published specs, not asserted. Switch the quant or the context and it recomputes in place.
gpt-oss-120b at Q6_K needs 98GB.
Cheapest Config that fits: DGX Spark, GB10 Grace Blackwell, 128GB. Fits, 23GB headroom. Est. 32.6 tok/s.
Best offer today: $4,699 at NVIDIA — in stock, checked 9 hours ago.
Collecting price history — 1 of 90 days. No timing verdict yet.
Offers — DGX Spark, GB10 Grace Blackwell, 128GB, 4TB
- NVIDIAlist pricein stockchecked 9 hours ago$4,699
- Mac mini, M6, 16GB$1,099Won't fit−85GB headroom
- Mac mini, M6, 24GB$1,299Won't fit−77GB headroom
- Mac mini, M6, 32GB$1,499Won't fit−69GB headroom
- Mac mini, M5 Pro, 24GB$1,699Won't fit−77GB headroom
- Mac mini, M5 Pro, 48GB$2,499Won't fit−54GB headroom
- Mac Studio, M5 Max, 36GB$2,499Won't fit−65GB headroom
- Mac mini, M5 Pro, 64GB$2,899Won't fit−39GB headroom
- Mac Studio, M5 Max, 48GB$3,099Won't fit−54GB headroom
- Mac Studio, M5 Max, 64GB$3,499Won't fit−39GB headroom
- Fits23GB headroomest. 32.6 tok/s
- Fits22GB headroomest. 73.4 tok/s
- Won't fit−9GB headroom
- GeForce RTX 5090, 32GB$5,699.99+hostWon't fit−67GB headroom
- Fits150GB headroomest. 143 tok/s
- Fits406GB headroomest. 143 tok/s
| Config | Memory | Price | $/GB | Fit | Headroom | Est. speed |
|---|---|---|---|---|---|---|
| Mac mini, M6 | 16GB | $1,099 | $69 | Won't fit | −85GB | — |
| Mac mini, M6 | 24GB | $1,299 | $54 | Won't fit | −77GB | — |
| Mac mini, M6 | 32GB | $1,499 | $47 | Won't fit | −69GB | — |
| Mac mini, M5 Pro | 24GB | $1,699 | $71 | Won't fit | −77GB | — |
| Mac mini, M5 Pro | 48GB | $2,499 | $52 | Won't fit | −54GB | — |
| Mac Studio, M5 Max | 36GB | $2,499 | $69 | Won't fit | −65GB | — |
| Mac mini, M5 Pro | 64GB | $2,899 | $45 | Won't fit | −39GB | — |
| Mac Studio, M5 Max | 48GB | $3,099 | $65 | Won't fit | −54GB | — |
| Mac Studio, M5 Max | 64GB | $3,499 | $55 | Won't fit | −39GB | — |
| DGX Spark, GB10 Grace Blackwell | 128GB | $4,699 | $37 | Fits | 23GB | 32.6 tok/s |
| Mac Studio, M5 Max | 128GB | $5,099 | $40 | Fits | 22GB | 73.4 tok/s |
| Mac Studio, M5 Ultra | 96GB | $5,499 | $57 | Won't fit | −9GB | — |
| GeForce RTX 5090 | 32GB | $5,699.99+host | $178 | Won't fit | −67GB | — |
| Mac Studio, M5 Ultra | 256GB | $9,499 | $37 | Fits | 150GB | 143 tok/s |
| Mac Studio, M5 Ultra | 512GB | — | — | Fits | 406GB | 143 tok/s |
GeForce RTX 5090 is a card, not a computer: its price is the US street median plus $1,000 for the minimum host machine. NVIDIA's $1,999 MSRP is not a price anyone pays.
memory = 117B × 0.820 B/param (6.56 bits) + 0.074 GB/1K × 8K K/V + 1.2 GB runtime
speed = bandwidth × 0.5 ÷ (5.1B active × 0.820 B/param) = 4.2 GB read per token
usable = memory − operating system reserve (8% on a Mac, 6% on a DGX Spark, 4% on a card)
Bandwidth is the vendor’s published figure. Every speed is an estimate and says so. Methodology.
What else DGX Spark GB10 Grace Blackwell 128GB runs
- Qwen3-235B-A22BQ3_K_M, est. 12.7 tok/s
- Mistral-Large-2411Q6_K, est. 1.8 tok/s
- gpt-oss-120bQ6_K, est. 32.6 tok/s
- Llama-4-Scout-17B-16EQ8_0, est. 7.6 tok/s
- Llama-3.3-70BQ8_0, est. 2.4 tok/s
- Qwen3-32BBF16, est. 2.8 tok/s
Best quant that still fits at 8K context, largest model first. Full list on the Config page.
Bandwidth 273GB/s, usable memory 120GB of 128GB.