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.
Short answer: AI API Cost Calculator — 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 answers “compare openai claude gemini api cost monthly”. Who it is for: Developers choosing between OpenAI, Claude and Gemini for production; Founders budgeting LLM spend per month; Product teams comparing the same workload across providers. 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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Who is this tool for?
- ✔ Developers choosing between OpenAI, Claude and Gemini for production
- ✔ Founders budgeting LLM spend per month
- ✔ Product teams comparing the same workload across providers
- ✔ Anyone whose API bill jumped after a model change
- ✔ Students learning how LLM pricing is structured
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.
Who is this AI API cost calculator for, and who should not rely on it alone?
It is for developers and founders comparing providers on the same workload. It is not a billing forecast for a production system with caching, retries, batching or negotiated rates — those move the real bill, so confirm with each provider's pricing page before budgeting.
Compare openai claude gemini api cost monthly?
Use the AI API Cost Calculator above: 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.