Claude Sonnet 4.5 API pricing
The 2025 Sonnet workhorse; huge installed base.
Input
$3.00
per 1M tokens
Cached input
$0.30
per 1M tokens
Cache write
$3.75
per 1M tokens
Output
$15.00
per 1M tokens
Context window
200K
max output 64K
Prices last synced Aug 20, 2026 from the LiteLLM community price catalog — the same catalog Marginal prices real usage events against, refreshed daily. Hand-checked against the provider's official pricing page on Aug 20, 2026. Spot an error? Tell us.
Pricing notes
- Cache writes $3.75/1M (5m) or $6.00/1M (1h); batch $1.50/$7.50. 200K context.
What would Claude Sonnet 4.5 cost you?
Enter your workload — add other models to compare the same traffic across providers.
Your monthly workload
Cache hit rate = share of input tokens served from the provider's prompt cache, billed at the model's cached-input price. Estimates use standard per-token rates — batch discounts, service tiers, and long-context surcharges are not applied.
| Model | Input | Cached input | Output | Per request | Monthly |
|---|---|---|---|---|---|
| Claude Sonnet 4.5 | $1,800 | $120 | $3,750 | $0.011 | $5,670 |
More from Anthropic
Tracking Claude Sonnet 4.5 in production?
Marginal prices every call your app actually makes — cached tokens, dated snapshots, model switches included — and slices spend by customer or feature. One track() call to integrate.