02 · Tokenizer Playground
Solution
Exact GPT token counts computed in the browser from the real BPE merge ranks — no API, no key, no text leaving the page.
tokenizer — playground
GPT-4o · GPT-4.1 · o-series
- Tokens
- —
- Characters
- 34
- Chars / token
- —
Loading o200k_base merge ranks…
Real GPT tokenizer (o200k_base, 199,998 tokens) running entirely in your browser — same BPE merges as the OpenAI tokenizer, no API calls and no keys.