AI Token Cost Calculator

Compare GPT, Claude, Gemini, and other models — estimate input tokens, output tokens, and total API cost.

Why use this calculator? Whether you're building an AI-powered app, running batch processing, or just curious about API costs, knowing the token economics helps you choose the right model and manage your budget.

This tool estimates the cost of a single API call based on your input text, expected output length, and the model you choose.

📘 How to use

1. Paste your input text (or type a prompt) — we'll estimate the number of input tokens.
2. Adjust the output length slider to match how many words you expect the AI to generate.
3. Select a model from the dropdown — we support GPT-4o, GPT-4o-mini, Claude 3.5 Sonnet, Claude 3 Opus, Gemini 1.5 Pro, Gemini 1.5 Flash, and others.
4. Click "Calculate Cost" to see the estimated cost for that model, plus a full comparison of all available models.

👥 Who this is for

• Developers and product managers evaluating API costs for their applications.
• AI researchers and data scientists running large-scale experiments.
• Content creators and marketers using AI for drafting, editing, or ideation.
• Anyone curious about token-based pricing and how different models compare.

Input text (or prompt)We estimate tokens based on ~4 characters per token.

Expected output length

10 words778 words1,000 words

Estimated output tokens ≈ words × 1.3

Select model                         GPT-4o                         GPT-4o-mini                         GPT-4 Turbo                         GPT-3.5 Turbo                         Claude 3.5 Sonnet                         Claude 3 Opus                         Claude 3 Haiku                         Gemini 1.5 Pro                         Gemini 1.5 Flash                     

Estimated cost for GPT-4o-mini

Input tokens

24

est. from text

Output tokens

195

est. from words

Total tokens

219

input + output

💵 Total cost

$0.000121

selected model

Compare all models

Model	Input Tokens	Output Tokens	Total Cost
GPT-4o	24	195	$0.003045
GPT-4o-mini ⭐	24	195	$0.000121
GPT-4 Turbo	24	195	$0.006090
GPT-3.5 Turbo	24	195	$0.000305
Claude 3.5 Sonnet	24	195	$0.002997
Claude 3 Opus	24	195	$0.014985
Claude 3 Haiku	24	195	$0.000250
Gemini 1.5 Pro	24	195	$0.002131
Gemini 1.5 Flash	24	195	$0.000241

⚡ Prices are estimates based on published API rates as of 2026. Actual costs may vary. Token counts are approximate. Always check official pricing for your region and volume discounts.

Built for developers, researchers, and AI enthusiasts.