o3vsGrok 4.1 Fast
o3 | Grok 4.1 Fast | |
|---|---|---|
| API pricingUSD per 1M tokens · lower wins | ||
Input priceWhat you pay for everything you send the model — your question, plus any documents or earlier conversation you include with it. | $2.00 | — |
Output priceWhat you pay for the text the model writes back. It is normally the dearer half: producing an answer costs more than reading one. | $8.00 | — |
Cached input priceA reduced rate for text you send over and over. If every request starts with the same instructions or the same document, the provider keeps a copy ready and charges less to read it again. | $0.50 | — |
| Benchmarks | ||
BullshitBench v2Nonsense detection — Given a confidently-worded but nonsensical prompt, does the AI spot that it makes no sense and push back — instead of playing along and inventing an answer? The score is how often it clearly called out the nonsense. Higher is better. | 26% | 19% |
| Overview | ||
| Company | OpenAI | SpaceXAI |
| Release date | Apr 16 2025 | Nov 19 2025 |
| Access | Proprietary | Proprietary |
Other comparisons
Frequently asked questions
o3 leads Grok 4.1 Fast on 1 of the 1 benchmark they both report (BullshitBench v2). Only o3 has a verified first-party API price: $2.00 per million input tokens and $8.00 per million output tokens. No pay-as-you-go API rate is tracked for Grok 4.1 Fast. o3 shipped 217 days before Grok 4.1 Fast, so benchmark comparisons should account for the intervening progress.
Published specifications for these two models are limited — see each model page for the latest details.
On BullshitBench v2, o3 leads at 26% vs Grok 4.1 Fast at 19%.