AI API Cost Calculator
Compare daily and monthly API costs across OpenAI GPT-5.6/5.5/5.4/5/4o, Anthropic Claude Opus 4.5, Sonnet 4.5, Haiku 4.5, and Google Gemini 3.1 Pro / 3.5 Flash based on your token volume — free, private, instant.
How to use AI API Cost Calculator
- Choose a provider and model.
- Enter input and output token volume per request.
- Set requests per day.
- See daily and monthly cost estimates side by side.
Frequently asked questions
Which AI providers does this calculator support?
OpenAI (GPT-5.6, GPT-5.5, GPT-5.4, GPT-5, GPT-4o, GPT-4 Turbo, GPT-3.5), Anthropic (Claude Opus 4.5, Sonnet 4.5, Haiku 4.5, Opus 4.1/4, Sonnet 4, 3.7 Sonnet, 3.5 Sonnet/Haiku, 3 Opus, 3 Haiku), and Google (Gemini 3.1 Pro, 3.5 Flash, 3.1 Flash-Lite, 2.5 Pro/Flash, 1.5 Pro/Flash).
Are the prices current?
We use published list prices at time of writing. Always confirm with the provider before budgeting.
Which LLM API is cheapest?
For most workloads, Gemini 3.1 Flash-Lite, GPT-5.4 nano, and Claude Haiku 4.5 are the cheapest tier.
How do I estimate monthly LLM API cost?
Multiply (input tokens + output tokens) per request × requests/day × 30 × model price. This calculator does that automatically.