Sonnet 5.5
Anthropic
🧠 Language Model
Sonnet 5.5 by Anthropic (2026-09-28): the best combination of speed and intelligence, for everyday coding, documents and agents. 1M context, 128K output, adaptive thinking.
Specifications
Input modalitiestext, image
Output modalitiestext
Capabilitiestools, reasoning
Relative speed●●●●○ Fast
Context window1,000,000 tokens
Max output128,000 tokens
Vision inputYes
Tool callingYes
Input price$3.50 / 1M
Output price$17.50 / 1M
Pricing
$3.50 / 1M input tokens · $17.50 / 1M output tokens
Platform credit pricing — live rates on the Models page.