AI Token Counter (GPT, Claude, Grok)
Size prompts before they blow the context window. Exact GPT-4o/4.1 tokenization in the browser; labeled estimates for Claude, Grok, Gemini and Cursor. Private by design for agent builders.
GPT counts use the real o200k_base tokenizer in your browser. Claude / Grok / Gemini / Cursor are labeled estimates (providers do not ship public client tokenizers).
AI token counter for ChatGPT, Claude, Grok & Cursor
Before you overflow a context window or burn API budget, count tokens locally. Exact for GPT-4o / GPT-4.1 (o200k); clear estimates for Claude, Grok, Gemini and coding agents. Your prompt never uploads—safe for proprietary code and customer data.
- Context fill % so you see when Cursor / Claude will truncate.
- Rough input cost at public list prices (illustrative).
- Pair with Secret redactor before pasting logs into any bot.
Domande frequenti
Is the GPT count exact?
Yes for GPT-4o / GPT-4.1 style models—we run the o200k_base tokenizer (gpt-tokenizer) in your browser. Claude, Grok and Gemini do not publish client tokenizers, so those rows are estimates.
Do you upload my prompt?
No. Counting is local. Safe for proprietary code you would not paste into a random SaaS counter.
Does this work for Grok bots and Cursor agents?
Yes as an estimate row. Use it to stay under context before sending long tool traces or Base64 blobs to any agent.
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