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. | 1M | 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. | $0.10 | — |
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. | $0.40 | — |
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. | $0.025 | — |
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. | $0.10Azure | — |
Cheapest outputLowest output rate across every provider on OpenRouter, the lab included. May come from a different provider than the cheapest input. | $0.40Azure | — |
| $40.00OpenAI list price | — | |
| Overview | ||
| Company | OpenAI | SpaceXSI |
| Release date | Apr 14 2025 | Sep 19 2025 |
| Access | Closed | Closed |
| Model details | View model | View model |
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GPT-4.1 nano and Grok 4 Fast don't publish scores on any of the same benchmarks, so there's no direct head-to-head comparison. Only GPT-4.1 nano has a verified first-party API price: $0.10 per million input tokens and $0.40 per million output tokens. No pay-as-you-go API rate is tracked for Grok 4 Fast. GPT-4.1 nano shipped 158 days before Grok 4 Fast, so benchmark comparisons should account for the intervening progress.
Context windows are 1M (GPT-4.1 nano) vs 2M (Grok 4 Fast).
Direct benchmark comparisons are unavailable — GPT-4.1 nano and Grok 4 Fast don't publish scores on any of the same benchmarks.