Token Counter is a free, open-source tool designed to help developers and AI enthusiasts accurately count tokens for various AI models.
Our mission is to provide accurate token counting for all major AI models including GPT-3.5, GPT-4, GPT-4.1, GPT-4.5, GPT-5, O1, O3, O4, and Claude models.
We are committed to keeping this tool free and accessible to everyone.