LLM API Cost Comparison Tool
Compare monthly costs side-by-side between OpenAI GPT-4o, Claude 3.5 Sonnet, and Gemini 1.5 Pro.
Educational Purpose Disclaimer
This calculator is provided for informational and educational estimation purposes only. All calculations and projections are based on standard mathematical formulas and assumed inputs. The output values should not be considered professional financial, legal, tax, or medical advice. ProCalc is not a registered financial advisor or licensed practitioner. Always consult a qualified professional (such as a Chartered Accountant, certified planner, or physician) before making major decisions.
What is the LLM API Cost Comparison Tool?
The LLM API Cost Comparison Tool is a developer decision engine built to compare monthly API billing rates side-by-side for the leading frontier LLMs. It calculates costs based on your specific traffic levels and token counts for OpenAI's GPT-4o, Anthropic's Claude 3.5 Sonnet, and Google's Gemini 1.5 Pro, and highlights the most cost-efficient option for your scale.
How Does the LLM API Cost Comparison Tool Work?
1. Input Monthly Requests — Enter expected API calls per month.
2. Define Prompt Context — Specify your average input (prompt) tokens.
3. Define Response Length — Input average output (generated response) tokens.
4. Compare Bills — Review monthly payouts side-by-side to make the right software choices.
Formula & Calculation Method
Standard API Rates (per million tokens):
- GPT-4o: Input: $2.50 | Output: $10.00
- Claude 3.5 Sonnet: Input: $3.00 | Output: $15.00
- Gemini 1.5 Pro (<128k): Input: $1.25 | Output: $5.00
Equation:
- Bill = ((Input Tokens × Input Rate) + (Output Tokens × Output Rate)) / 1,000,000 × Monthly Requests
Example Calculation
Example: App handling 10,000 requests/mo, 5,000 input tokens, 1,000 output tokens.
- GPT-4o: ((5,000 × $2.50) + (1,000 × $10.00)) / 1M × 10,000 = $225.00
- Claude Sonnet: ((5,000 × $3.00) + (1,000 × $15.00)) / 1M × 10,000 = $300.00
- Gemini Pro: ((5,000 × $1.25) + (1,000 × $5.00)) / 1M × 10,000 = $112.50
- Winner: Gemini 1.5 Pro is the cheapest, saving you $187.50 over Claude!
Frequently Asked Questions
**Standard API Rates (per million tokens):** - **GPT-4o:** Input: $2.50 | Output: $10.00 - **Claude 3.5 Sonnet:** Input: $3.00 | Output: $15.00 - **Gemini 1.5 Pro (<128k):** Input: $1.25 | Output: $5.00 **Equation:** - Bill = ((Input Tokens × Input Rate) + (Output Tokens × Output Rate)) / 1,000,000 × Monthly Requests
Disclaimer: This tool is provided for informational and calculation purposes. Output values are estimates based on standard user inputs.