Claude Sonnet 4.5 vs Grok 4.3
Anthropic vs xAI — benchmarks, pricing, and capabilities side by side.
- •Grok 4.3 has the higher intelligence index (90.1 vs 80.4)
- •Grok 4.3 is cheaper ($1.25 vs $3.00 per 1M input)
- •Grok 4.3 is faster
| Claude Sonnet 4.5 | Grok 4.3 | |
|---|---|---|
| Intelligence index | 80.4 | 90.1 |
| Developer | Anthropic | xAI |
| Type | LLM | LLM |
| Access | API only | API only |
| Context window | 1,000,000 tokens | 1,000,000 tokens |
| Input price | $3.00 / 1M | $1.25 / 1M |
| Output price | $15.00 / 1M | $2.50 / 1M |
| Speed | 42 tok/s | 88 tok/s |
| Released | September 29, 2025 | May 6, 2026 |
| Parameters | — | — |
| Input modalities | Text, Image | Text, Image |
| Output modalities | Text | Text |
Shared benchmarks
Claude Sonnet 4.5
Grok 4.3
GPQA Diamond
83.4
90.1
Humanity’s Last Exam
17.3
35