This free AI Token Cost Calculator helps developers and teams compare API pricing across OpenAI GPT-5.5, GPT-5.4, Anthropic Claude Opus 4.6, Sonnet 4.6, Google Gemini 3.1 Pro, and DeepSeek V4 models. Calculate input tokens, output tokens, cache write, and cache read costs instantly. Includes a built-in token counter powered by tiktoken for accurate OpenAI token counting. All prices are updated monthly from official vendor websites.