Claude Sonnet 5.5

Q: What is the API model name for Claude Sonnet 5.5?

Use claude-sonnet-5-5 in API calls to Anthropic. The context window is 1M tokens, and a response can run to 128,000 output tokens.

Claude Sonnet 5.5 API pricing is $2 per million input tokens and $10 per million output tokens.

Provider: Anthropic
API model name: claude-sonnet-5-5
Status: Current
Input, $ per 1M tokens: $2.00
Cached input, $ per 1M tokens: $0.10
Output, $ per 1M tokens: $10.00
Sample request (10K in, 2K out), $: $0.04
Context window, tokens: 1M
Price checked on: October 31, 2026
Official pricing page: platform.claude.com

These are standard rates on Anthropic’s own API, the same as Claude Sonnet 5. Cached input is billed at $0.10 per million tokens. A request with 10,000 input tokens and 2,000 output tokens costs about $0.04 before caching or batch discounts. The API model name is claude-sonnet-5-5, and the context window is 1M tokens. Claude Haiku 4.5 handles the same request for about $0.02. Cache writes cost $2.50 per 1M tokens for a 5-minute cache and $4 for a 1-hour cache.

Cache writes, $ per 1M tokens: $2.50
Max output, tokens: 128K
Input types: Text, image, file
Open weights: No
Batch pricing: 50% off input and output tokens
Pricing notes: Cache writes cost $2.50 per 1M tokens for a 5-minute cache and $4 for a 1-hour cache.
Sources: Page URL Checked
Claude API pricing https://platform.claude.com/docs/en/about-claude/pricing 2026-10-19
OpenRouter model listing (context and output limits) https://openrouter.ai/models 2026-09-29

Page	URL	Checked
Claude API pricing	https://platform.claude.com/docs/en/about-claude/pricing	2026-10-19
OpenRouter model listing (context and output limits)	https://openrouter.ai/models	2026-09-29

Questions

How much does the Claude Sonnet 5.5 API cost?

Claude Sonnet 5.5 costs $2 per million input tokens and $10 per million output tokens on Anthropic’s own API. Cached input costs $0.10 per million tokens.

What is the API model name for Claude Sonnet 5.5?

Use claude-sonnet-5-5 in API calls to Anthropic. The context window is 1M tokens, and a response can run to 128,000 output tokens.

What does one Claude Sonnet 5.5 request cost?

A request with 10,000 input tokens and 2,000 output tokens costs about $0.04 at standard rates, before caching or batch discounts. Batch requests get 50% off input and output tokens.

How much do Claude Sonnet 5.5 cache writes cost?

Cache writes cost $2.50 per 1M tokens for a 5-minute cache and $4 for a 1-hour cache.

Sources

Prices are read from each provider’s official pricing page: OpenAI, Anthropic, Google Gemini API, xAI, DeepSeek and Mistral AI. Context and output limits that a provider does not publish come from OpenRouter’s model listing. Each model’s Sources field lists the pages used and the date each was checked. How we check prices · Price change log