Estimate GPT token costs for OpenAI API usage. Calculate prompt, response, daily, and monthly AI spend before you scale.
Calculate GPT Token CostsEstimate GPT token costs for OpenAI API usage. Calculate prompt, response, daily, and monthly AI spend before you scale.
Use the 4Genius AI GPT Cost Calculator to estimate how much GPT-powered apps, chatbots, workflows, and automations may cost based on prompt tokens, response tokens, request volume, and monthly usage.
OpenAI charges for GPT API usage based on tokens. A token is roughly 4 characters or ¾ of an English word. When you use GPT through an API, you're charged for:
Different GPT models have different pricing. GPT-4o Mini is the most economical at $0.15 per 1M input tokens, while GPT-5 Pro costs $30 per 1M input tokens — 200x more expensive.
Customer service bots, AI assistants, and conversational interfaces typically process 50-500 tokens per message.
Blog posts, articles, and marketing copy can range from 500-2000 tokens depending on length and detail.
Code completion and debugging typically uses 100-1000 tokens per request.
Automated pipelines processing documents, emails, or data can scale to thousands of requests daily.
GPT-5 Series
GPT-5, GPT-5 Mini, GPT-5 Nano
GPT-4 Series
GPT-4, GPT-4o, GPT-4.1, GPT-4o Mini
O-Series
o1, o3, o1-mini, o3-mini
Plus custom pricing support for any OpenAI model or API configuration.
Common questions about GPT cost estimation and OpenAI API pricing.
Enter your GPT usage details and get an instant estimate of your monthly API costs. No signup required.