Calculate the monthly and annual cost of your AI API usage. Compare GPT-4o, Claude Sonnet, Gemini, and more by tokens per request and daily request volume.
Added May 3, 2026
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Result
Enter a value for model to see your result.
Calculate daily, monthly, and yearly AI API costs for any model and request volume. Compare GPT-4o, Claude, Gemini, and more to find the most cost-effective option for your workload.
A typical chatbot with short prompts and responses costs about $3 per month on GPT-4o mini at 1,000 req/day.
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Result
You pay separately for input tokens (your prompt) and output tokens (the model's response). Cost = (input_tokens / 1,000,000) × input_price + (output_tokens / 1,000,000) × output_price. Multiply by daily requests for ongoing costs.
GPT-4o mini, Claude 3.5 Haiku, and Gemini 1.5 Flash are the lowest-cost options among major providers. For very high volumes, the difference between models can be 10–100× in monthly spend.
Input tokens include your system prompt, conversation history, and the user's message. Output tokens are everything the model generates in its response. Long system prompts and history are often the biggest cost drivers.