Cost Breakdown
How to Use This Calculator
Calculate your OpenAI API costs in 4 simple steps:
- Select a Model: Choose from GPT-5, GPT-4o, o3, o1, or custom pricing
- Enter Input Tokens: Your prompt/context token count
- Enter Output Tokens: Expected response token count
- View Results: See total cost + detailed breakdown per 1K tokens
OpenAI API Pricing Formula
The calculation uses OpenAI's official pricing structure:
Cost per 1K Input = Input Price / 1,000
Cost per 1K Output = Output Price / 1,000
Real-World Example
Scenario: Building a chatbot with GPT-5
Input: 1,000 tokens (user messages + context)
Output: 500 tokens (assistant responses)
Calculation:
- Input Cost: (1,000 / 1,000,000) × $10.00 = $0.0100
- Output Cost: (500 / 1,000,000) × $40.00 = $0.0200
- Total Cost: $0.0300 per conversation
Why This Matters
Understanding your API costs is crucial for:
- Budgeting for AI-powered features
- Pricing your SaaS product correctly
- Optimizing token usage for cost efficiency
- Comparing different model cost-effectiveness
Frequently Asked Questions
What is the difference between input and output tokens?
Input tokens are what you send to the model (prompts, context, instructions). Output tokens are what the model generates back (responses, completions). Output is typically more expensive.
Which model is most cost-effective?
For simple tasks, GPT-5 mini ($0.75/$3.00) offers the best value. For complex reasoning, o3-mini ($4.00/$16.00) provides good balance. GPT-5 ($10.00/$40.00) is best for maximum capability.
How accurate is this calculator?
This calculator uses OpenAI's official 2026 pricing. Actual costs may vary slightly due to tokenization differences, but estimates are typically within 1-2% of actual charges.
Can I use custom pricing?
Yes! Select "Custom" from the model dropdown and enter your own input/output prices per 1M tokens.
Is this calculator free?
Absolutely! This OpenAI Token Cost Calculator is completely free to use as many times as you need.