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.
AI API Cost Calculator is a free online ai tool from FastDailyTools (Compare OpenAI, Claude, and Gemini API pricing.). 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. It runs entirely in your browser — no sign-up, no account, no email and no upload — and every result can be exported as a dated PDF report.
- ✔ Price: free, unlimited use, no rate limits
- ✔ Sign-up: not required
- ✔ Privacy: all math runs client-side, nothing is uploaded
- ✔ Export: one-click PDF report (2026 rates)
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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.