OPENAI TOKEN COUNTER

OpenAI Token Counter

Count tokens for any OpenAI model with the same tokenizer encodings the API uses. Counts run entirely in your browser with exact o200k_base and cl100k_base tokenization, so the number you see here matches what OpenAI bills.

PROMPT

Count OpenAI tokens live.

Model Expected output

Tokens

Words

Characters

Input cost

$0.00

Output cost

$0.00

Total request

$0.00

1,047,576 token context window Exact tokenizer 0%

Need optimization signals, a heatmap, monthly projections, or cross-provider comparison? Open the full analyzer.

How OpenAI tokenization works

OpenAI models use byte-pair encoding (BPE). Current GPT-5 and GPT-4o generation models use the o200k_base encoding; older GPT-4 and GPT-3.5 models used cl100k_base.

English prose averages about 4 characters or 0.75 words per token. Code, JSON, URLs, and non-English text tokenize heavier.

Both the prompt you send (input tokens) and the response (output tokens) are billed, at different rates per model.

This page loads the official tokenizer encodings in your browser, so counts are exact for text input and nothing you paste is uploaded.

OpenAI models and current pricing

GPT-5.5 Token Counter

1,047,576 token context. $5.00 in / $30.00 out per 1M tokens.

GPT-5.5 Pro Token Counter

1,047,576 token context. $30.00 in / $180.00 out per 1M tokens.

GPT-5.4 Token Counter

1,047,576 token context. $2.50 in / $15.00 out per 1M tokens.

GPT-5.4 mini Token Counter

1,047,576 token context. $0.75 in / $4.50 out per 1M tokens.

GPT-5.4 nano Token Counter

1,047,576 token context. $0.20 in / $1.25 out per 1M tokens.

GPT-5.4 Pro Token Counter

1,047,576 token context. $30.00 in / $180.00 out per 1M tokens.

GPT-5.2 Token Counter

400,000 token context. $1.75 in / $14.00 out per 1M tokens.

GPT-5.2 Pro Token Counter

400,000 token context. $21.00 in / $168.00 out per 1M tokens.

GPT-5.1 Token Counter

400,000 token context. $1.25 in / $10.00 out per 1M tokens.

GPT-5 Token Counter

400,000 token context. $1.25 in / $10.00 out per 1M tokens.

GPT-5 mini Token Counter

400,000 token context. $0.25 in / $2.00 out per 1M tokens.

GPT-5 nano Token Counter

400,000 token context. $0.05 in / $0.40 out per 1M tokens.

GPT-5 Pro Token Counter

400,000 token context. $15.00 in / $120.00 out per 1M tokens.

GPT-4.1 Token Counter

1,047,576 token context. $2.00 in / $8.00 out per 1M tokens.

GPT-4.1 mini Token Counter

1,047,576 token context. $0.40 in / $1.60 out per 1M tokens.

GPT-4.1 nano Token Counter

1,047,576 token context. $0.10 in / $0.40 out per 1M tokens.

GPT-4o Token Counter

128,000 token context. $2.50 in / $10.00 out per 1M tokens.

GPT-4o mini Token Counter

128,000 token context. $0.15 in / $0.60 out per 1M tokens.

o3 Token Counter

200,000 token context. $2.00 in / $8.00 out per 1M tokens.

o4-mini Token Counter

200,000 token context. $1.10 in / $4.40 out per 1M tokens.

Pricing refreshed 2026-07-01 from official provider sources. Compare against other providers on the LLM pricing table or browse the full model directory.

FAQ

OpenAI token counter FAQ

Is this OpenAI token counter exact?

Yes. It runs the same o200k_base and cl100k_base BPE encodings the OpenAI API uses, in your browser. For plain text prompts the count matches what the API reports and bills. Chat requests add a few tokens of per-message formatting overhead on top.

How do I count tokens for the OpenAI API without calling it?

Paste your prompt above and choose your model. The tokenizer runs locally, so you can measure system prompts, RAG payloads, and few-shot examples before sending a single billable request.

Which OpenAI models does this support?

All OpenAI API text models in our catalog, including GPT-5.5, GPT-5.4, GPT-5, GPT-4.1, GPT-4o, o3, and o4-mini, each with current input and output pricing from the official OpenAI pricing page.