LLM Token Tracker offers a comprehensive solution for transparently tracking token usage and associated costs across both OpenAI and Claude APIs. It seamlessly integrates by wrapping existing API clients, automatically calculating expenses with up-to-date pricing for a wide range of models. The tool supports tracking usage per user or session, provides currency conversion (USD, KRW), and can act as an MCP server for applications like Claude Desktop, enabling real-time conversational cost insights, budget management, and comparison between different LLM models. It also includes file-based persistence to maintain historical usage data across restarts.