Claude Sonnet 4 API Cost Calculator
Estimate your monthly API costs for Claude Sonnet 4 from Anthropic.
Pricing per 1M tokens
Pricing last verified: Mar 21, 2026
30-Day Price History
Solid line: input price · Dashed line: output price
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Cost Breakdown
Compare with Similar Models
| Model | Input/1M | Output/1M |
|---|---|---|
| Claude 3.7 Sonnet Anthropic | $3.00 | $15.00 |
| Claude 3.7 Sonnet (thinking) Anthropic | $3.00 | $15.00 |
| Claude Sonnet 4.5 Anthropic | $3.00 | $15.00 |
| Claude Sonnet 4.6 Anthropic | $3.00 | $15.00 |
| Claude Haiku 4.5 Anthropic | $1.00 | $5.00 |
Frequently Asked Questions
How much does Claude Sonnet 4 cost per token?
Claude Sonnet 4 is priced at $3.00 per 1M input tokens and $15.00 per 1M output tokens. Use the calculator above to estimate your monthly costs based on your usage volume.
What is the context window for Claude Sonnet 4?
Claude Sonnet 4 has a context window of 200K tokens (200,000 tokens). The maximum output length is 64K tokens.
Does Claude Sonnet 4 support image inputs (vision)?
Yes, Claude Sonnet 4 supports vision/image inputs. You can send images as part of your prompts.
Does Claude Sonnet 4 support function calling (tool use)?
Yes, Claude Sonnet 4 supports function calling (also called tool use). You can define custom functions that the model can invoke as part of its responses.
How does Claude Sonnet 4 compare to similar models?
Claude Sonnet 4 costs $3.00 input and $15.00 output per 1M tokens. Claude Haiku 4.5 is less expensive at $1.00 input and $5.00 output per 1M tokens. See the "Compare with Similar Models" table above, or visit the Claude Haiku 4.5 page at /tools/cost-calculator/anthropic/claude-haiku-4-5.