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. | 128k | 256k |
| API pricingUSD per 1M tokens · lower wins · base tier | ||
Input priceWhat you pay for everything you send the model — your question, plus any documents or earlier conversation you include with it. | — | $1.00 |
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. | — | $2.00 |
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. | — | $0.20 |
| — | $300SpaceXSI list price | |
| These models have no shared benchmark scores. | ||
SWE-Bench VerifiedCoding — Real coding tasks pulled from open-source projects — the AI has to find and fix actual bugs. A human-checked version of the original SWE-Bench. Higher is better. | — | 70.8% |
| Overview | ||
| Company | OpenAI | SpaceXSI |
| Release date | Feb 27 2025 | Aug 28 2025 |
| Access | Closed | Closed |
| Model details | View model | View model |
Other comparisons
GPT-4.5vsClaude Haiku 5.5Grok Code Fast 1vsClaude Haiku 5.5GPT-4.5vsGemini 4 ArgonGrok Code Fast 1vsGemini 4 ArgonGPT-4.5vsMuse Spark OpenGrok Code Fast 1vsMuse Spark OpenGPT-4.5vsDeepSeek-V4.1-Flash-1017Grok Code Fast 1vsDeepSeek-V4.1-Flash-1017GPT-4.5vsMistral Large 4Grok Code Fast 1vsMistral Large 4GPT-4.5vsKimi K3Grok Code Fast 1vsKimi K3Frequently asked questions
GPT-4.5 and Grok Code Fast 1 don't publish scores on any of the same benchmarks, so there's no direct head-to-head comparison. Only Grok Code Fast 1 has a verified first-party API price: $1.00 per million input tokens and $2.00 per million output tokens. No pay-as-you-go API rate is tracked for GPT-4.5. GPT-4.5 shipped 182 days before Grok Code Fast 1, so benchmark comparisons should account for the intervening progress.
Context windows are 128k (GPT-4.5) vs 256k (Grok Code Fast 1).
Direct benchmark comparisons are unavailable — GPT-4.5 and Grok Code Fast 1 don't publish scores on any of the same benchmarks.