AI API Cost Calculator
If you searched for an API cost calculator, AI pricing calculator, or monthly AI API cost estimate, start here. Enter your token usage and request volume to compare cost per request, cost per 1,000 API calls, daily spend, and monthly budget across the major AI models.
Pricing data last updated: September 22, 2026
What this API cost calculator helps you estimate
Use this page when you need a fast AI API cost estimate before choosing a model. It converts token counts and request volume into cost per request, cost per 1,000 API calls, daily spend, and monthly budget so you can price a chatbot, agent, summarization flow, or internal automation without building your own spreadsheet.
The main trap with AI pricing is that a model that looks cheap per token can still become expensive when outputs are long or usage volume spikes. This calculator makes that visible quickly across OpenAI, Claude, Gemini, DeepSeek, Mistral, Grok, and other major model families.
Need the next step after the estimate? Check the live AI API pricing table for raw rates, use the model comparison pages for side-by-side tradeoffs, or jump to use-case calculators for chatbot, RAG, coding, and content workflows.
Frequently Asked Questions
How do I get an AI API cost estimate?
Start with three inputs: average prompt tokens, average response tokens, and daily request volume. The estimator multiplies those numbers by live model pricing so you can see cost per request, daily spend, and projected monthly budget before you commit to a provider.
What is the cheapest AI API for a chatbot in 2026?
For most chatbot workloads, efficient models like GPT-5 nano, GPT-4o mini, Gemini Flash-Lite, and DeepSeek V4 Flash are usually the first places to look. The cheapest winner depends on your prompt length, response length, and quality bar, which is why the estimator compares the real monthly total instead of just raw token prices.
How much does an OpenAI or Claude API cost per month?
Monthly cost depends far more on usage pattern than the brand name alone. A lightweight support bot on GPT-4o mini or Claude Haiku can stay inexpensive, while high-volume workflows or premium models like GPT-5 and Claude Opus rise quickly. Use the estimator above to compare OpenAI, Claude, Gemini, DeepSeek, Mistral, and Grok with the same workload assumptions.
How do I estimate my AI API costs?
Estimate AI API costs by calculating average input tokens, average output tokens, and daily request volume, then multiplying that usage by each model's per-token pricing. This page automates the math and ranks the cheapest options for the exact workload you enter.
Which AI model gives the best value for money?
The best value model is usually the cheapest one that still clears your quality bar. For many production workloads that means starting with efficient models, then moving up only when quality or reasoning depth breaks. Compare your shortlist with the same token assumptions so you are judging total cost, not marketing claims.