Grok 4 Fast (Reasoning) vs GPT-4o
Grok 4 Fast (Reasoning) is cheaper on output tokens, while Grok 4 Fast (Reasoning) offers a larger context window. Choose Grok 4 Fast (Reasoning) or GPT-4o based on the trade-off between cost, context, and the benchmarks that matter for your use case.
| Spec | Grok 4 Fast (Reasoning) | GPT-4o |
|---|---|---|
| Provider | Azure Cognitive Services | Azure Cognitive Services |
| Input / 1M tokens | $0.20 | $2.50 |
| Output / 1M tokens | $0.50 | $10.00 |
| Context window | 2M | 128K |
| Parameters | — | — |
| Open weights | No | No |
| Released | Sep 2025 | May 2024 |
FAQ
Pricing is indicative — confirm with the provider before production use. Highlighted values indicate the better figure for that row.