Claude Opus 4.8 vs Claude Opus 5.5
Claude Opus 5.5 is cheaper on output tokens. Choose Claude Opus 4.8 or Claude Opus 5.5 based on the trade-off between cost, context, and the benchmarks that matter for your use case.
| Spec | Claude Opus 4.8 | Claude Opus 5.5 |
|---|---|---|
| Provider | Anthropic | Anthropic |
| Input / 1M tokens | $5.00 | $4.00 |
| Output / 1M tokens | $25.00 | $20.00 |
| Context window | 1M | 1M |
| Parameters | — | — |
| Open weights | — | — |
| Released | — | — |
| GPQA Diamond score | 91.0 | 90.6 |
| FrontierMath score | 47.2 | — |
| Epoch Capabilities Index score | 160 | 168 |
| LMArena (Chatbot Arena) Elo score | 1461 | 1516 |
| LMArena WebDev Elo score | 1556 | 1810 |
| LMArena Vision Elo score | 1294 | 1321 |
FAQ
Is Claude Opus 4.8 or Claude Opus 5.5 cheaper?
Claude Opus 5.5 is cheaper on output tokens ($20.00 vs $25.00 per 1M).
Which has the larger context window, Claude Opus 4.8 or Claude Opus 5.5?
Both models offer a similar context window.
Pricing is indicative — confirm with the provider before production use. Highlighted values indicate the better figure for that row.