Free tool
AI API Cost Calculator
Estimate your monthly API spend across GPT-4o, Claude, and Gemini from your own usage — ranked cheapest-first. Free and instant.
1M tokens ≈ 750,000 words. Tip: a chatbot turn is often ~500–2,000 in / ~200–800 out.
- GPT-4o minicheapest$4.50/mo
- Gemini 2.5 Flash$15.50/mo
- Claude Haiku$28.00/mo
- Gemini 2.5 Pro$62.50/mo
- GPT-4o$75.00/mo
- Claude Sonnet 4$105/mo
- Claude Opus 4$525/mo
Cheaper still: run a capable model locally for $0/token.
Approximate public list prices ($/1M tokens). Directional only — confirm current pricing with each provider.
Frequently asked
- How is the AI API cost calculated?
- Monthly cost = (requests × avg input tokens ÷ 1M × input price) + (requests × avg output tokens ÷ 1M × output price), summed for each model at its public per-million-token rate.
- How many tokens is a typical request?
- Roughly: 1M tokens ≈ 750,000 words. A single chatbot turn is often ~500–2,000 input tokens and ~200–800 output tokens, depending on context size.
- How can I lower my AI costs?
- Route cheap, short tasks to a smaller model (e.g. GPT-4o mini, Claude Haiku, Gemini Flash) and reserve the strong model for hard work — or run a capable open model locally for $0 per token.