GPT-5.5 vs Grok 4.3
OpenAI vs xAI — benchmarks, pricing, and capabilities side by side.
- •Grok 4.3 has the higher intelligence index (90.1 vs 76.1)
- •Grok 4.3 is cheaper ($1.25 vs $5.00 per 1M input)
- •Grok 4.3 is faster
- •GPT-5.5 has a larger context window (1.1M)
| GPT-5.5 | Grok 4.3 | |
|---|---|---|
| Intelligence index | 76.1 | 90.1 |
| Developer | OpenAI | xAI |
| Type | LLM | LLM |
| Access | API only | API only |
| Context window | 1,050,000 tokens | 1,000,000 tokens |
| Input price | $5.00 / 1M | $1.25 / 1M |
| Output price | $30.00 / 1M | $2.50 / 1M |
| Speed | 67 tok/s | 88 tok/s |
| Released | April 23, 2026 | May 6, 2026 |
| Parameters | — | — |
| Input modalities | Text, Image | Text, Image |
| Output modalities | Text | Text |
Shared benchmarks
GPT-5.5
Grok 4.3
GPQA Diamond
93.5
90.1
Humanity’s Last Exam
44.3
35