Grok 4.3 vs o3
xAI vs OpenAI — benchmarks, pricing, and capabilities side by side.
- •Grok 4.3 has the higher intelligence index (90.1 vs 71.6)
- •Grok 4.3 is cheaper ($1.25 vs $2.00 per 1M input)
- •Grok 4.3 is faster
- •Grok 4.3 has a larger context window (1M)
| Grok 4.3 | o3 | |
|---|---|---|
| Intelligence index | 90.1 | 71.6 |
| Developer | xAI | OpenAI |
| Type | LLM | LLM |
| Access | API only | API only |
| Context window | 1,000,000 tokens | 200,000 tokens |
| Input price | $1.25 / 1M | $2.00 / 1M |
| Output price | $2.50 / 1M | $8.00 / 1M |
| Speed | 88 tok/s | 50 tok/s |
| Released | May 6, 2026 | April 16, 2025 |
| Parameters | — | — |
| Input modalities | Text, Image | Text, Image |
| Output modalities | Text | Text |
Shared benchmarks
Grok 4.3
o3
GPQA Diamond
90.1
87.7
Humanity’s Last Exam
35
24.3