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. | $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. | $120.00 | — |
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. | $120.00OpenAI | — |
| $9,000OpenAI 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 Pro 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 Pro has a verified first-party API price: $15.00 per million input tokens and $120.00 per million output tokens. No pay-as-you-go API rate is tracked for Grok 4. Grok 4 shipped 29 days before GPT-5 Pro, so benchmark comparisons should account for the intervening progress.
Context windows are 400k (GPT-5 Pro) vs 256k (Grok 4).
Direct benchmark comparisons are unavailable — GPT-5 Pro and Grok 4 don't publish scores on any of the same benchmarks.