Claude Opus 4.5 vs Grok 4.20 0309
Anthropic vs xAI — benchmarks, pricing, and capabilities side by side.
- •Grok 4.20 0309 has the higher intelligence index (88.5 vs 88)
- •Grok 4.20 0309 is cheaper ($2.00 vs $5.00 per 1M input)
- •Grok 4.20 0309 is faster
| Claude Opus 4.5 | Grok 4.20 0309 | |
|---|---|---|
| Intelligence index | 88 | 88.5 |
| Developer | Anthropic | xAI |
| Type | LLM | LLM |
| Access | API only | — |
| Context window | 200,000 tokens | — |
| Input price | $5.00 / 1M | $2.00 / 1M |
| Output price | $25.00 / 1M | $6.00 / 1M |
| Speed | 58 tok/s | 97 tok/s |
| Released | November 24, 2025 | March 10, 2026 |
| Parameters | — | — |
| Input modalities | Text, Image | — |
| Output modalities | Text | — |
Shared benchmarks
Claude Opus 4.5
Grok 4.20 0309
GPQA Diamond
87
88.5
Humanity’s Last Exam
28.4
30