Grok 4.3 vs o3-mini
xAI vs OpenAI — benchmarks, pricing, and capabilities side by side.
- •Grok 4.3 has the higher intelligence index (90.1 vs 64.1)
- •o3-mini is cheaper ($1.10 vs $1.25 per 1M input)
- •o3-mini is faster
- •Grok 4.3 has a larger context window (1M)
| Grok 4.3 | o3-mini | |
|---|---|---|
| Intelligence index | 90.1 | 64.1 |
| 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 | $1.10 / 1M |
| Output price | $2.50 / 1M | $4.40 / 1M |
| Speed | 88 tok/s | 115 tok/s |
| Released | May 6, 2026 | January 31, 2025 |
| Parameters | — | — |
| Input modalities | Text, Image | Text |
| Output modalities | Text | Text |
Shared benchmarks
Grok 4.3
o3-mini
GPQA Diamond
90.1
77.2
Humanity’s Last Exam
35
12.3