Claude Opus 4.5 — API Pricing & Benchmarks
Claude Opus 4.5 is Anthropic's previous-generation reasoning model, released in 2025-11. The API costs $5.00 per 1M input tokens and $25.0 per 1M output tokens ($10.0 blended at a 3:1 ratio), with cached input at $0.50. It supports a 200K-token context window. On the independently measured Artificial Analysis Intelligence Index it scores 41.9, ranking #38 of 68 models tracked on this site.
Explore provider routes and additional benchmark sources for Claude Opus 4.5
| Provider | Anthropic |
| Input price / 1M tokens | $5.00 |
| Output price / 1M tokens | $25.0 |
| Cached input / 1M tokens | $0.50 |
| Blended price (3:1) | $10.0 |
| Context window | 200K |
| Max output tokens | 64K |
| Knowledge cutoff | — |
| License | proprietary |
| Input modalities | T+I |
| Output speed (tok/s) | — |
| Released | 2025-11 |
| Artificial Analysis Intelligence Index | 41.9 |
| LMArena Elo | 1450 |
| GPQA Diamond | 86.6% |
| Humanity's Last Exam | 30.1% |
Where Claude Opus 4.5 fits
On a blended 3:1 basis Claude Opus 4.5 costs $10.0 per 1M tokens, cheaper than 8% of the 80 priced models in this index. It is a previous-generation model: usually only worth choosing if you have an existing integration, negotiated pricing, or need its specific behavior, since newer siblings offer better price-performance. Cached input is priced at $0.50 (90% below standard input), which rewards prompt structures with long stable prefixes — see our caching guide.
Price history
| Period | Input $/1M | Output $/1M | Cached $/1M |
|---|---|---|---|
| 2026-08-25 → current | $5.00 | $25.0 | $0.50 |
No list-price changes recorded since tracking began. Full dataset: price-history.json (CC BY 4.0).
Alternatives at a similar price
- Claude Opus 5 (Anthropic) — $10.0/1M blended, AA Index 63.1
- Claude Opus 4.8 (Anthropic) — $10.0/1M blended, AA Index 57.3
- Claude Opus 4.7 (Anthropic) — $10.0/1M blended, AA Index 55
- Claude Opus 4.6 (Anthropic) — $10.0/1M blended, AA Index 44.9
About Anthropic
Anthropic builds the Claude family, organized into Opus (flagship), Sonnet (mid-tier) and Haiku (small) tiers alongside the Fable line. Claude models currently lead the Artificial Analysis Intelligence Index and are particularly strong on agentic-coding benchmarks such as SWE-bench Verified.