Claude Opus 4.5 vs Claude Opus 4.8 Thinking
Both have similar output pricing, while Claude Opus 4.8 Thinking offers a larger context window. Choose Claude Opus 4.5 or Claude Opus 4.8 Thinking based on the trade-off between cost, context, and the benchmarks that matter for your use case.
| Spec | Claude Opus 4.5 | Claude Opus 4.8 Thinking |
|---|---|---|
| Provider | Anthropic | NanoGPT |
| Input / 1M tokens | $5.00 | $5.00 |
| Output / 1M tokens | $25.00 | $25.00 |
| Context window | 200K | 1M |
| Parameters | — | — |
| Open weights | No | No |
| Released | Nov 2025 | May 2026 |
| LiveBench score | 76.0 | 79.5 |
| LMArena (Chatbot Arena) Elo score | 1451 | — |
| SWE-bench Multilingual score | 70.7 | — |
| SWE-bench Verified score | 79.2 | — |
| LMArena WebDev Elo score | 1494 | — |
| FrontierMath score | 20.7 | — |
| Epoch Capabilities Index score | 150 | — |
| GPQA Diamond score | 86.0 | — |
FAQ
Is Claude Opus 4.5 or Claude Opus 4.8 Thinking cheaper?
Claude Opus 4.5 and Claude Opus 4.8 Thinking have comparable output pricing.
Which has the larger context window, Claude Opus 4.5 or Claude Opus 4.8 Thinking?
Claude Opus 4.8 Thinking has the larger context window (1M tokens).
Pricing is indicative — confirm with the provider before production use. Highlighted values indicate the better figure for that row.