Historical model (legacy). The rates below are the last recorded rates, not a recommendation for a new deployment.
Claude Sonnet 4.5 API Pricing
Claude Sonnet 4.5 costs $3.00 per 1M input tokens and $15.00 per 1M output tokens.These rates were last verified on .
Published rates and billing units
| Billing dimension | USD list price |
|---|---|
| Input / 1M tokens | $3.00 |
| Cached input / 1M tokens | $0.30 |
| Output / 1M tokens | $15.00 |
| Cache write / 1M tokens | $3.75 |
| Cache write (1 hour) / 1M tokens | $6.00 |
| Batch: Input / 1M tokens | $1.50 |
| Batch: Output / 1M tokens | $7.50 |
| Batch: Cached input / 1M tokens | $0.15 |
| Batch: Cache write / 1M tokens | $1.88 |
| Batch: Cache write (1 hour) / 1M tokens | $3.00 |
Verified 2026-10-25 · Official source · Pricing methodology. Taxes, optional services and account-specific discounts are not included.
Cost examples
These examples use published list prices only. They exclude taxes, enterprise discounts, minimum charges, retries, batch discounts, and provider-specific billing rules.
1M input + 1M output
$18.00
A direct per-million comparison against every other text model.
100K input + 25K output
$0.675
A compact chat, summarization, or analysis workload.
10M input + 2M output
$60.00
A monthly production estimate for heavier RAG or agent traffic.
75% cached input + 250K output
$4.73
Cached input is about 90% cheaper than standard input at list price.
Calculator for Claude Sonnet 4.5
Enter your own input, output, and cached-token assumptions. This calculator is preloaded with only Claude Sonnet 4.5, so the result stays focused on this model.
Input cost
$3.00
Output cost
$15.00
Total
$18.00
Price history
No list-price movement across 192 daily snapshots from 2026-04-16 to 2026-10-25.
When to use Claude Sonnet 4.5
Good fit
- code generation, debugging, and agentic development work where output quality affects engineering time
Be careful with
- bulk summarization or simple classification where cheaper models can pass evaluation