Grok 4.3 vs Mercury 2
xAI vs Inception — benchmarks, pricing, and capabilities side by side.
- •Grok 4.3 has the higher intelligence index (90.1 vs 77)
- •Mercury 2 is cheaper ($0.25 vs $1.25 per 1M input)
- •Mercury 2 is faster
- •Grok 4.3 has a larger context window (1M)
| Grok 4.3 | Mercury 2 | |
|---|---|---|
| Intelligence index | 90.1 | 77 |
| Developer | xAI | Inception |
| Type | LLM | LLM |
| Access | API only | API only |
| Context window | 1,000,000 tokens | 128,000 tokens |
| Input price | $1.25 / 1M | $0.25 / 1M |
| Output price | $2.50 / 1M | $0.75 / 1M |
| Speed | 88 tok/s | 790 tok/s |
| Released | May 6, 2026 | March 4, 2026 |
| Parameters | — | — |
| Input modalities | Text, Image | Text |
| Output modalities | Text | Text |
Shared benchmarks
Grok 4.3
Mercury 2
GPQA Diamond
90.1
77
Humanity’s Last Exam
35
15.5