GPT-4o Token Calculator — Count Tokens & Estimate API Cost
GPT-4o Token Calculator is a free, browser-based developer tool that counts tokens for GPT-4o using the official OpenAI o200k_base tokenizer and forecasts API costs in real time. Unlike word-based counters, it returns reliable token counts and live API cost estimates entirely in your browser: no uploads, no API keys, no sign-up. It is one of 90+ models covered by TokenCalc, a free AI token calculator for developers.
→ Open the GPT-4o token counter — paste any prompt or document, get token counts and cost estimates in seconds.
GPT-4o pricing (2026)
| Model | Tokenizer | Input / 1M tokens | Output / 1M tokens | Context window |
|---|---|---|---|---|
| GPT-4o | o200k_base | $2.50 | $10.00 | 128K |
| GPT-4o mini | o200k_base | $0.15 | $0.60 | 128K |
GPT-4o token counter by the numbers
- 90+ LLM tokenizers supported in one free tool
- 128K token context window on GPT-4o
- 1.3 average tokens per English word
- $2.50 / $10.00 per 1M input / output tokens for GPT-4o
- 100% in-browser — your text never leaves the device
- 0 uploads, 0 API keys, 0 cost
How many tokens is a word in GPT-4o?
One English word averages ~1.3 tokens (roughly 4 characters per token). The exact ratio depends on your text:
- Common short words are often a single token.
- Long or technical words split into several tokens.
- Code and special characters tokenize more densely than prose.
- Chinese text runs ~0.6–1.2 tokens per character.
Why count GPT-4o tokens?
- Budget context — know how many tokens a document takes before it enters your prompt.
- Forecast costs — see the exact $ cost of a request at per-1M-token rates.
- Compare models — the same text tokenizes differently across model families.
GPT-4o token counter — free and private
Our AI Token Calculator covers GPT-4o, plus exact token counts for GPT-5, GPT-4o, o1, o3 (official tiktoken) and 90+ more models — all in your browser, no upload, no API key.
→ Open the GPT-4o token counter (free, private)
GPT-4o token FAQs
How many tokens is a word in GPT-4o?
One English word averages about 1.3 tokens (roughly 4 characters per token). Chinese text runs around 0.6–1.2 tokens per character. Always verify with a real token counter.
How much does GPT-4o API cost per 1M tokens?
See the pricing table on this page for GPT-4o input and output rates per 1M tokens.
Is the GPT-4o token counter private?
Yes. Everything runs locally in your browser — your text never leaves your device, no uploads, no API keys, no sign-up.
What is a token in GPT-4o?
A token is the smallest unit of text a model’s tokenizer processes — roughly one English word equals 1.3 tokens. A model’s context window is measured in tokens, so an accurate count tells you how much text fits in a prompt.
Is GPT-4o Token Calculator a good alternative to tiktoken?
Yes for most use cases. tiktoken is OpenAI’s Python library; GPT-4o Token Calculator runs the identical o200k tokenizer in the browser with no install or API key, plus live cost estimates.