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AI Token Cost Calculator
Calculate the exact API cost for OpenAI, Claude, and Gemini models
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How It Works
This calculator helps you estimate API costs for major AI language models including OpenAI GPT, Anthropic Claude, and Google Gemini. Each model charges separately for input tokens (what you send) and output tokens (what the AI generates), priced per million tokens.
The calculator multiplies your input and output token counts by their respective per-million-token rates, then scales up based on your daily request volume and working days per month. This gives you an accurate picture of real-world API costs at scale.
Understanding your token costs is essential for budgeting AI applications, choosing the right model for your use case, and optimizing prompt efficiency to reduce expenses.
Frequently Asked Questions
What are input and output tokens?
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Input tokens are the text you send to the AI (your prompt, context, documents). Output tokens are the text the AI generates in response. Both are counted separately and often priced differently. Roughly, 1 token equals about 4 characters or 0.75 words in English.
Which model should I choose?
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Choose based on your needs: GPT-4o and Claude Opus for complex reasoning and coding, Sonnet models for balanced performance and cost, Flash/Haiku models for high-volume simple tasks. More expensive models are generally more capable but may be overkill for simple tasks.
How can I reduce token costs?
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Reduce costs by: using shorter, more focused prompts; choosing smaller models for simple tasks; caching repeated context; limiting output length with max_tokens; using cheaper models like Haiku or Flash for high-volume operations; and optimizing prompts to get better results in fewer attempts.
Are these prices accurate and current?
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Prices are based on publicly available pricing as of early 2025. AI providers occasionally adjust pricing, so verify current rates on OpenAI, Anthropic, and Google websites before making major commitments. This calculator provides estimates for planning purposes.
Do these prices include all API costs?
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These are base API costs for text generation. Some providers charge extra for: fine-tuning, embeddings, image generation, vision capabilities, function calling overhead, or batch processing. Check provider documentation for complete pricing on advanced features.