GPT-5 nano 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 71.2)
- •GPT-5 nano is cheaper ($0.05 vs $1.25 per 1M input)
- •GPT-5 nano is faster
- •Grok 4.3 has a larger context window (1M)
| GPT-5 nano | Grok 4.3 | |
|---|---|---|
| Intelligence index | 71.2 | 90.1 |
| Developer | OpenAI | xAI |
| Type | LLM | LLM |
| Access | API only | API only |
| Context window | 400,000 tokens | 1,000,000 tokens |
| Input price | $0.05 / 1M | $1.25 / 1M |
| Output price | $0.40 / 1M | $2.50 / 1M |
| Speed | 500 tok/s | 88 tok/s |
| Released | August 7, 2025 | May 6, 2026 |
| Parameters | — | — |
| Input modalities | Text, Image | Text, Image |
| Output modalities | Text | Text |
Shared benchmarks
GPT-5 nano
Grok 4.3
GPQA Diamond
71.2
90.1
Humanity’s Last Exam
8.7
35