Compare AI models
| Specifications | ||
Context windowHow much information the model can work with in one request, measured in tokens — pieces of words or other data. This includes your question, attachments, conversation and reply. Limits can vary by model variant and provider. | 200k | 2M |
| 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. | $15.00 | — |
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. | $60.00 | — |
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. | $7.50 | — |
Cheapest inputLowest input rate across every provider on OpenRouter, the lab included. The cheapest endpoint may run a quantised build or a shorter context — see "Available from" on the model page. | $15.00OpenAI | — |
Cheapest outputLowest output rate across every provider on OpenRouter, the lab included. May come from a different provider than the cheapest input. | $60.00OpenAI | — |
| $6,000OpenAI list price | — | |
| These models have no shared benchmark scores. | ||
GPQA DiamondScience — Graduate-level science questions in biology, physics, and chemistry — hard enough that subject-matter PhDs score around 65%. Higher is better. | 75.7% | — |
| Overview | ||
| Company | OpenAI | SpaceXSI |
| Release date | Dec 5 2024 | Sep 19 2025 |
| Access | Closed | Closed |
| Model details | View model | View model |
Other comparisons
o1vsClaude Haiku 5.5Grok 4 FastvsClaude Haiku 5.5o1vsGemini 4 ArgonGrok 4 FastvsGemini 4 Argono1vsMuse Spark OpenGrok 4 FastvsMuse Spark Openo1vsDeepSeek-V4.1-Flash-1017Grok 4 FastvsDeepSeek-V4.1-Flash-1017o1vsMistral Large 4Grok 4 FastvsMistral Large 4o1vsKimi K3Grok 4 FastvsKimi K3Frequently asked questions
o1 and Grok 4 Fast don't publish scores on any of the same benchmarks, so there's no direct head-to-head comparison. Only o1 has a verified first-party API price: $15.00 per million input tokens and $60.00 per million output tokens. No pay-as-you-go API rate is tracked for Grok 4 Fast. o1 shipped 288 days before Grok 4 Fast, so benchmark comparisons should account for the intervening progress.
Context windows are 200k (o1) vs 2M (Grok 4 Fast).
Direct benchmark comparisons are unavailable — o1 and Grok 4 Fast don't publish scores on any of the same benchmarks.