OpenAI API Cost Calculator
OpenAI charges for API requests per 1 million tokens. Standard pricing for GPT-5.5 is $5.00 per 1M input tokens and $30.00 per 1M output tokens. GPT-4o costs $2.50 per 1M input and $10.00 per 1M output, while GPT-5.4 mini costs $0.75 per 1M input and $4.50 per 1M output.
API Cost Estimation Calculator
Comparative API Execution Cost Table
Comparison of API prompt costs for 100,000 input tokens and 20,000 output tokens across models.
| Model | Input Cost / 1M | Output Cost / 1M | Single Run Cost |
|---|---|---|---|
| GPT-5.5 | $5.00 | $30.00 | $1.10 |
| GPT-5.5 Pro | $30.00 | $180.00 | $6.60 |
| GPT-5.4 mini | $0.75 | $4.50 | $0.17 |
| GPT-5.4 nano | $0.20 | $1.25 | $0.05 |
| GPT-4o | $2.50 | $10.00 | $0.45 |
| GPT-4o mini | $0.15 | $0.60 | $0.03 |
| o3 | $2.00 | $8.00 | $0.36 |
| o4-mini | $1.10 | $4.40 | $0.20 |
| GPT-4 | $30.00 | $60.00 | $4.20 |
| GPT-3.5 Turbo | $0.50 | $1.50 | $0.08 |