Claude Opus 5.5 vs xAI Grok 4
30-second takeaway
- xAI Grok 4 has the cheaper input: $3 vs $4 (per 1M tokens, 25% less)
- Claude Opus 5.5 has the larger context: 1M vs 256K tokens
| Claude Opus 5.5 AI/ML API | xAI Grok 4 Helicone | |
|---|---|---|
| Input | $4 | $3 |
| Output | $20 | $15 |
| Context | 1M | 256K |
More specs (max output / capabilities)
| max output | 128,000 | 256,000 |
| Reasoning | ✓ Yes | — No |
| Tool calls | ✓ Yes | ✓ Yes |
| Open weights | — No | — No |
Prices are official/data-source rates (per 1M tokens), not what relays actually charge — relay prices vary with discounts and group multipliers. See methodology.