Claude Opus 5.5 — API Pricing & Benchmarks
Claude Opus 5.5 is Anthropic's flagship reasoning model, released in 2026-09. The API costs $4.00 per 1M input tokens and $20.0 per 1M output tokens ($8.00 blended at a 3:1 ratio), with cached input at $0.20. It supports a 1M-token context window. On the independently measured Artificial Analysis Intelligence Index it scores 57.6, ranking #1 of 72 models tracked on this site, with a median output speed of 85 tokens/sec.
Explore provider routes and additional benchmark sources for Claude Opus 5.5
| Provider | Anthropic |
| Input price / 1M tokens | $4.00 |
| Output price / 1M tokens | $20.0 |
| Cached input / 1M tokens | $0.20 |
| Blended price (3:1) | $8.00 |
| Context window | 1M |
| Max output tokens | 128K |
| Knowledge cutoff | 2026-06 |
| License | proprietary |
| Input modalities | T+I |
| Output speed (tok/s) | 85 |
| Released | 2026-09 |
| Artificial Analysis Intelligence Index | 57.6 |
| Humanity's Last Exam | 61.4% |
Where Claude Opus 5.5 fits
On a blended 3:1 basis Claude Opus 5.5 costs $8.00 per 1M tokens, cheaper than 13% of the 84 priced models in this index. As Anthropic's flagship it is aimed at the hardest workloads — complex reasoning, agentic coding and multi-step tool use — where output quality dominates cost. Cached input is priced at $0.20 (95% below standard input), which rewards prompt structures with long stable prefixes — see our caching guide.
Price history
| Period | Input $/1M | Output $/1M | Cached $/1M |
|---|---|---|---|
| 2026-09-22 → current | $4.00 | $20.0 | $0.20 |
No list-price changes recorded since tracking began. Full dataset: price-history.json (CC BY 4.0).
Alternatives at a similar price
- GPT-5.6 Sol (OpenAI) — $8.00/1M blended, AA Index 47
- Claude Opus 5 (Anthropic) — $10.0/1M blended, AA Index 50.8
- Claude Opus 4.8 (Anthropic) — $10.0/1M blended, AA Index 41.8
- Claude Opus 4.7 (Anthropic) — $10.0/1M blended, AA Index 40.7
Compare Claude Opus 5.5
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.