Cheapest GPU for gpt-oss-120b
B200 is the cheapest at $0.011 per million tokens, 0% below MI355X.
Measured on a single-turn chat workload (8k input / 1k output) at a matched interactivity target of 50 tokens/s per user. Hardware without a measurement at this operating point is not ranked.
| Rank | GPU | Tokens/s per GPU | $ / 1M tokens | Precision | Engine |
|---|---|---|---|---|---|
| 1 | B200 | 44,489 | $0.011 | fp4 | vLLM |
| 2 | MI355X | 38,497 | $0.011 | fp4 | vLLM |
Optimizing for speed instead of cost? See the fastest GPU for gpt-oss-120b
Methodology
Every number on this page is a measurement, not a spec-sheet estimate. The InferenceX fleet serves gpt-oss-120b on real hardware with community serving engines, sweeping concurrency to trace each platform's throughput-versus-interactivity frontier.
Platforms are then read at the same operating point (50 tokens/s per user) so the comparison is iso-interactivity: a GPU cannot win by quoting throughput at an unusably slow per-user speed. Cost converts measured throughput to $ per million total tokens using $/GPU/hr rates from the SemiAnalysis AI Cloud TCO model.
The derivation is shared with the InferenceX overview leaderboard, and results re-run continuously, so this ranking updates as new engine releases and configs land.
Frequently asked questions
- What is the cheapest GPU to run gpt-oss-120b?
- As of the latest benchmark runs, B200 is cheapest at $0.011 per million total tokens on a single-turn chat workload (8k input / 1k output), at hyperscaler $/GPU/hr pricing and a matched interactivity target of 50 tokens/s per user.
- How is cost per million tokens calculated?
- Measured throughput per GPU at the 50 tokens/s per user tier is converted to $ per million total (input plus output) tokens using hyperscaler $/GPU/hr rates from the SemiAnalysis AI Cloud TCO model. Slower interactivity targets or cheaper rental tiers change the absolute numbers but rarely the order.
- How often is this ranking updated?
- Benchmarks re-run continuously on the InferenceX cluster fleet; the newest result feeding this ranking landed on 2026-06-05. The page always renders the latest data.