Claude Opus 5.5 vs Claude Opus 4.5 (latest)
30-second takeaway
- Claude Opus 5.5 has the cheaper input: $4 vs $5 (per 1M tokens, 20% less)
- Claude Opus 5.5 has the larger context: 1M vs 200K tokens
| Claude Opus 5.5 AI/ML API | Claude Opus 4.5 (latest) Anthropic | |
|---|---|---|
| Input | $4 | $5 |
| Output | $20 | $25 |
| Context | 1M | 200K |
More specs (max output / capabilities)
| max output | 128,000 | 64,000 |
| Reasoning | ✓ Yes | ✓ Yes |
| 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.