LLM API Cost Calculator (OpenAI, Claude, Gemini & DeepSeek)
Calculate and compare API costs across OpenAI GPT-4o, Claude 3.5 Sonnet, Gemini 1.5 Pro, and DeepSeek V3.
LLM API Cost Calculator
Compare API costs across OpenAI GPT-4o, Claude 3.5 Sonnet, Gemini 1.5 Pro & DeepSeek V3.
⚙️ API Usage & Token Parameters
📊 Multi-Model Cost Comparison
What is the LLM API Cost Calculator (OpenAI, Claude, Gemini & DeepSeek)?
The LLM API Cost Calculator helps developers, AI founders, and engineers estimate and compare API costs across top Large Language Models (LLMs) including OpenAI (GPT-4o, GPT-4o-mini), Anthropic (Claude 3.5 Sonnet, Claude 3 Opus), Google (Gemini 1.5 Pro, Gemini 1.5 Flash), and DeepSeek (V3 & R1).
AI API token pricing is split into Input Tokens (prompt context) and Output Tokens (generated response). Model prices range dramatically from $0.14/1M tokens (DeepSeek / GPT-4o-mini) to $15.00+/1M tokens (Claude 3 Opus).
This calculator computes your estimated token consumption based on input/output words, request volume, prompt caching discounts (up to 50% off), and batch API pricing to output a Side-by-Side Model Cost Comparison Table.
How Does the LLM API Cost Calculator (OpenAI, Claude, Gemini & DeepSeek) Work?
1. Enter Average Words per Request — Input expected prompt length and generated answer length.
2. Set Daily API Requests — Enter total request volume per day.
3. Select Primary Model — Choose GPT-4o, GPT-4o-mini, Claude 3.5 Sonnet, Gemini 1.5 Pro, or DeepSeek V3.
4. Enable Custom Discounts — Toggle Prompt Caching (-50% input cost) or Batch API (-50% total cost).
5. View Cost Breakdown & Side-by-Side Comparison — Compare monthly spend across all major providers.
Formula & Calculation Method
1. Token Estimation:
$$\text{Input Tokens} = \text{Input Words} \times 1.333, \quad \text{Output Tokens} = \text{Output Words} \times 1.333$$
2. Monthly Tokens:
$$\text{Monthly Input Tokens} = \text{Input Tokens} \times \text{Requests/Day} \times 30$$
$$\text{Monthly Output Tokens} = \text{Output Tokens} \times \text{Requests/Day} \times 30$$
3. Model Cost Calculation:
$$\text{Monthly Cost} = \left( \frac{\text{Input Tokens}}{1,000,000} \times \text{Input Rate} \times \text{Cache Mult} \right) + \left( \frac{\text{Output Tokens}}{1,000,000} \times \text{Output Rate} \right) \times \text{Batch Mult}$$
Example Calculation
Example: AI Application with 10,000 Daily Requests (500 Input Words / 200 Output Words)
- Monthly Input Tokens = 500 × 1.333 × 10,000 × 30 = 200 Million Tokens
- Monthly Output Tokens = 200 × 1.333 × 10,000 × 30 = 80 Million Tokens
Cost Comparison:
- GPT-4o ($2.50 in / $10.00 out): $500 + $800 = $1,300/month
- Claude 3.5 Sonnet ($3.00 in / $15.00 out): $600 + $1,200 = $1,800/month
- GPT-4o-mini ($0.15 in / $0.60 out): $30 + $48 = $78/month (94% Savings!)
- DeepSeek V3 ($0.14 in / $0.28 out): $28 + $22.40 = $50.40/month