AI API Cost Calculator
Model
Input Tokens per Request
Output Tokens per Request
Monthly Requests
An AI API cost calculator estimates the cost of using large language model APIs based on token usage. AI APIs charge separately for input (prompt) and output (completion) tokens.
- 1Cost = (input tokens ÷ 1000) × input rate + (output tokens ÷ 1000) × output rate
- 2Rates are per 1,000 tokens (or per million tokens on newer models)
- 3Monthly cost = cost per request × monthly request volume
- 4Input tokens are typically cheaper than output tokens
GPT-4o: 500 input + 200 output tokens, 1000 req/month=~$3.25/month
Claude Haiku: same usage=~$1.20/month
GPT-4o-mini: 1M requests/month=~$150–300/month typical
| Model | Input ($/1K) | Output ($/1K) |
|---|---|---|
| GPT-4o | $0.0025 | $0.010 |
| GPT-4o-mini | $0.00015 | $0.0006 |
| Claude Sonnet 4 | $0.003 | $0.015 |
| Claude Haiku 4 | $0.0008 | $0.004 |
| Gemini 1.5 Pro | $0.00125 | $0.005 |
References
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