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How much does the Claude Sonnet 5.5 API cost?

Answer
$2.00 per 1M input tokens · $10.00 per 1M output

Claude Sonnet 5.5 costs $2.00 per million input tokens and $10.00 per million output tokens; cached input is $0.20. At a typical 1,000 requests a day (2,000 input and 500 output tokens), that's $270.00 a month.

api-cost.tsadjust the values
tokens
Prompt + history + attached documents.
tokens
%
Batch API (−50%)
Examples

Claude Sonnet 5.5 pricing table

ItemValue
Input$2.00
Cached input$0.20
Cache write (5 min)$2.50
Output$10.00
Context1,000,000 tokens
Max output128,000 tokens

The same usage on other models

Monthly cost of 1,000 requests a day, with 2,000 input and 500 output tokens each:

ModelInputOutputExample per month
GPT-5.6 Luna$0.20$1.20$30.00
Claude Haiku 4.5$1.00$5.00$135.00
Claude Sonnet 5.5$2.00$10.00$270.00
GPT-5.6 Terra$2.00$12.00$300.00
Claude Opus 5.5$4.00$20.00$540.00
GPT-5.6 Sol$5.00$30.00$750.00
Claude Fable 5.1$10.00$50.00$1,350

How to pay less

Use prompt caching for the fixed part of your calls and the Batch API (50% off) for anything that can wait up to 24 hours. The calculator above shows the effect of each.

More questions like this

Frequently asked questions

What is 1M tokens?

A million tokens is about 737,000 English words on GPT-5.6, or roughly 1,470 pages. On Claude 5.x models, about 509,000 words.

What currency is the API billed in?

US dollars, by card. Your bank converts to local currency and may add fees and taxes.

Subscription or API?

For daily personal use, plans (Claude Pro, ChatGPT Plus) usually pay off. For products, automation and variable volume, the API. See the subscription vs API calculator.

Estimate based on public prices as of October 2026. Token counts vary with the text and the model; check the official pricing page before you decide.