Input
$2
Output
$10
Context
1M
Claude Sonnet 5.5 costs $2 per million input tokens and $10 per million output tokens. Cached input is billed at $0.10 per million, 95% less than fresh input.
Specifications
| Lab | Anthropic |
| Model id | anthropic/claude-sonnet-5.5 |
| Input price | $2 per million tokens |
| Output price | $10 per million tokens |
| Cached input price | $0.10 per million tokens |
| Context window | 1,000,000 tokens (1M) |
| Maximum output | 128,000 tokens (128K) |
| Tool calling | yes |
| Image input | yes |
| Reasoning | yes |
| Intelligence index | 54.2 |
| First listed | 28 September 2026 |
Models it replaced
The feeds list Claude Sonnet 5.5 in place of anthropic/claude-sonnet-4.5, anthropic/claude-sonnet-4.6, anthropic/claude-sonnet-5. Those models' own prices and limits were different; an article that names one of them describes the model it was written about.
Anthropic's other models
| Model | Input / 1M | Output / 1M | Context | Listed |
|---|---|---|---|---|
| Claude Haiku 5.5 | $0.10 | $0.50 | 1M | 7 October 2026 |
| Claude Opus 5.5 | $4 | $20 | 1M | 22 September 2026 |
| Claude Fable 5.1 | $10 | $50 | 1M | 1 September 2026 |
Cited in these articles
- Claude Opus 4.8 Benchmarks and Guide 2026
- Building Software With AI: The 2026 Guide
- Claude Code Websites: Build and Deploy in 2026
- The AI-Native Company Tech Stack (2026)
- Claude Code: The 2026 Website Builder Guide
- Top 20 Claude Code Skills for Web and App Builds
- Claude Sonnet 5 for Building Websites (2026)
- Claude Haiku 5.5: 75% Cheaper Than 4.5, Takes On GPT-6 Luna
- Claude Max API Credits: Claim Them, Ship an App (2026)
Where these numbers come from
Read from OpenRouter's listing of Claude Sonnet 5.5 every 6 hours, with Anthropic's own /models endpoint confirming the model, into the catalog Founden's builders choose their models from. Prices are OpenRouter's listed price per million tokens: for a lab's closed models that is the lab's own list price, and for an open-weight model it is the price of the host OpenRouter routes to by default, which can differ from the lab's own API and from other hosts. US dollars, before batch, volume or regional discounts. Every model.