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tokenmath provides a free web-based calculator that estimates the cost of API calls to large language models. The calculator uses heuristics and publicly available pricing data, and is provided for informational and budgeting purposes only.
Token counts are estimates based on character-count heuristics, accurate to roughly ±4% on typical text. Real API billing may differ. Pricing data is updated periodically but may not reflect the most recent changes by AI vendors. Always verify with each provider's official documentation before making business decisions.
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