Claude Sonnet 5.5
- Publisher
- Anthropic
- Context
- 1M
- Input
- Output
- Released
- 28 Sep 2026
Cite
Notes
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Context
1M
Input
$2
/1M tok
Output
$10
/1M tok
Cache read
$0.20
0.10x input
Cache write
$2.50
1.25x input
Price & speed via Artificial Analysis · ranked across tracked models · caching via OpenRouter
| Reasoning effort | Index | Speed |
|---|---|---|
| Reasoning, max | 56.0 | 0 t/s |
| Reasoning, xhigh | 51.9 | 0 t/s |
| Reasoning, high | 46.7 | 0 t/s |
| Reasoning, medium | 40.7 | 0 t/s |
| Reasoning, low | 35.8 | 0 t/s |
Intelligence Index per reasoning-effort setting, via Artificial Analysis · pricing identical across tiers
Reported on 9 evals across 7 domains - best 100.0% on ProofBench · #1 of 70