Claude Opus vs Grok-4 Heavy
Anthropic vs xAI — benchmarks, pricing, and capabilities side by side.
| Claude Opus | Grok-4 Heavy | |
|---|---|---|
| Intelligence index | — | 89.3 |
| Developer | Anthropic | xAI |
| Type | Multimodal | Multimodal |
| Access | API only | API only |
| Context window | 1,000,000 tokens | — |
| Input price | $5.00 / 1M | — |
| Output price | $25.00 / 1M | — |
| Speed | — | — |
| Released | April 21, 2026 | July 9, 2025 |
| Parameters | — | — |
| Input modalities | Text, Image | — |
| Output modalities | Text | — |