Claude Sonnet 4.5 API Pricing

Claude Sonnet 4.5 by Anthropic costs $3.00 per million input tokens and $15.00 per million output tokens.

Price verified from Anthropic's pricing page.

Rates and limits

Input / 1M
$3.00
Output / 1M
$15.00
Cached input / 1M
$0.30
Cache write / 1M
$3.75
Batch discount
50% off
Context window
1M tokens
Released
August 2025

What Claude Sonnet 4.5 costs per month

Token volume split 3:1 between input and output, with no prompt caching.

Tokens per monthInput / outputStandardBatch API
1M750K / 250K$6.00$3.00
10M7.5M / 2.5M$60.00$30.00
100M75M / 25M$600.00$300.00
Estimate your own workload with Claude Sonnet 4.5

Where to run Claude Sonnet 4.5

Prices above are Anthropic's direct rates. Cloud platforms can charge differently; the cloud platform view compares them.

Claude Sonnet 4.5 pricing FAQ

How much does Claude Sonnet 4.5 cost per million tokens?

Claude Sonnet 4.5 costs $3.00 per million input tokens and $15.00 per million output tokens, as listed on Anthropic's pricing page on October 5, 2026.

How much does Claude Sonnet 4.5 cost for 10 million tokens a month?

About $60.00 a month, assuming 7.5 million input and 2.5 million output tokens with no prompt caching, or $30.00 through the batch API.

What is the context window of Claude Sonnet 4.5?

Claude Sonnet 4.5 accepts up to 1,000,000 tokens of context.

Does Claude Sonnet 4.5 support prompt caching?

Yes. Cached input tokens cost $0.30 per million, 90% less than the standard input rate. Writing a prefix to the cache costs $3.75 per million tokens.

Is there a batch discount for Claude Sonnet 4.5?

Yes. Requests sent through the batch API cost 50% less: $1.50 per million input tokens and $7.50 per million output tokens.

Where can I use the Claude Sonnet 4.5 API?

Claude Sonnet 4.5 is available through Anthropic API, AWS Bedrock, Google Cloud Vertex AI, and OpenRouter.

Compare with other models

Prices shown as input / output per million tokens. All model prices · Side-by-side comparison