GPT-5 Pro vs Grok 3 Reasoning
OpenAI vs xAI — benchmarks, pricing, and capabilities side by side.
- •Grok 3 Reasoning is cheaper ($0.00 vs $15.00 per 1M input)
| GPT-5 Pro | Grok 3 Reasoning | |
|---|---|---|
| Intelligence index | 88.4 | — |
| Developer | OpenAI | xAI |
| Type | LLM | LLM |
| Access | API only | — |
| Context window | 400,000 tokens | — |
| Input price | $15.00 / 1M | $0.00 / 1M |
| Output price | $120.00 / 1M | $0.00 / 1M |
| Speed | — | — |
| Released | October 6, 2025 | February 19, 2025 |
| Parameters | — | — |
| Input modalities | Text, Image | — |
| Output modalities | Text | — |