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. | 400k | 256k |
| 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. | $0.05 | — |
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. | $0.005 | — |
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. | $0.025OpenAI | — |
Cheapest outputLowest output rate across every provider on OpenRouter, the lab included. May come from a different provider than the cheapest input. | $0.20OpenAI | — |
| $30.00OpenAI list price | — | |
| Overview | ||
| Company | OpenAI | SpaceXSI |
| Release date | Aug 7 2025 | Jul 9 2025 |
| Access | Closed | Closed |
| Model details | View model | View model |
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GPT-5 nano and Grok 4 don't publish scores on any of the same benchmarks, so there's no direct head-to-head comparison. Only GPT-5 nano has a verified first-party API price: $0.05 per million input tokens and $0.40 per million output tokens. No pay-as-you-go API rate is tracked for Grok 4. Grok 4 shipped 29 days before GPT-5 nano, so benchmark comparisons should account for the intervening progress.
Context windows are 400k (GPT-5 nano) vs 256k (Grok 4).
Direct benchmark comparisons are unavailable — GPT-5 nano and Grok 4 don't publish scores on any of the same benchmarks.