AI & LLM
Tools for working with language models: count tokens, calculate costs and see how your text is split. Deterministic and in your browser, with no API calls.
2 tools
LLM Token Counter & AI Cost Calculator
Count the tokens in your text or prompt and estimate the cost across GPT-5, Claude, Gemini, Kimi K3, Grok and DeepSeek. Exact OpenAI counting, per-call and monthly costs, with prompt caching.
OpenTokenizer Visualizer
Paste text and see exactly which tokens a language model splits it into, with their IDs. Check why Spanish costs more tokens than English.
Open