Claude Sonnet 4.5 API pricing at a glance
For Anthropic’s first-party Claude API, the listed standard rates are $3 per million input tokens and $15 per million output tokens, in USD. The unit is MTok, or one million tokens. These are API usage charges, not a Claude app subscription price. (platform.claude.com)
| Anthropic Claude API usage | Price per million tokens (USD) |
|---|---|
| Input | $3.00 |
| Output | $15.00 |
Estimate your API charges
For standard, uncached usage, estimate token charges as:
(input tokens ÷ 1,000,000 × $3) + (output tokens ÷ 1,000,000 × $15)
For 1,000 input tokens and 500 output tokens:
- Input: 1,000 ÷ 1,000,000 × $3 = $0.003
- Output: 500 ÷ 1,000,000 × $15 = $0.0075
- Estimated token charge: $0.0105
For 100 million input tokens and 20 million output tokens per month, the same standard rates give $300 input + $300 output = $600. This is an illustrative estimate, assuming standard uncached usage and that each request fits within the listed context window. It excludes other provider or feature charges.
Anthropic’s model reference lists a 200K-token context window for Sonnet 4.5. The official material cited here does not establish extended-context access or a premium long-context rate for this model, so these estimates are limited to standard-rate requests within the listed window. That does not establish that extended access is unavailable; confirm its availability and billing terms with Anthropic before budgeting for it. (platform.claude.com)
Prompt caching and Batch API usage are excluded from these examples. Check their applicable pricing and requirements before including them in a workload estimate.
Production availability
Anthropic marks Sonnet 4.5 as deprecated—still functional, but no longer recommended—and schedules its retirement for November 30, 2026. As of November 9, 2026, that date is 21 days away. Anthropic says the lifecycle dates apply to its operated platforms; partner-operated platforms set their own retirement schedules. Check the lifecycle terms for your specific API channel before committing a production budget. (platform.claude.com)
Bottom line: Anthropic lists Sonnet 4.5 at $3/M input and $15/M output in USD. Use the formula above for standard-rate estimates, and account for the model’s scheduled retirement when planning production usage.
Sources
Pricing - Claude Platform Docs