OPENAI MODEL TOKEN COUNTER
Count tokens for o3 and estimate API cost before you send a request. Counts run the exact o200k_base (OpenAI) in your browser. Your text never leaves the browser.
PROMPT
Tokens
0
Words
0
Characters
0
Input cost
$0.00
Output cost
$0.00
Total request
$0.00
Need optimization suggestions, a token heatmap, monthly cost projection, or a side-by-side model comparison? Open the full analyzer with o3 preselected.
Provider. OpenAI
Context window. 200,000 tokens (about 150,000 English words).
API pricing. $2.00 input / $8.00 output per 1M tokens.
Tokenizer. o200k_base (OpenAI) - exact, runs in your browser.
Pricing source. Official OpenAI pricing page, checked 2026-07-01. Prices in the catalog were last refreshed 2026-07-01 and are estimates, not quotes.
See the OpenAI Token Counter for all OpenAI models in one counter. Or browse the full model token counter directory and the LLM pricing comparison table to see how o3 prices against other providers.
FAQ
Paste your prompt into the counter on this page. o3 uses the o200k_base (OpenAI), and the count runs in your browser with the same published tokenizer, so the number matches what the API reports for plain text.
o3 costs $2.00 per 1 million input tokens and $8.00 per 1 million output tokens, based on official OpenAI pricing checked 2026-07-01.
o3 has a context window of 200,000 tokens, which is roughly 150,000 English words of combined prompt and response. The counter above shows how much of that window your text consumes.
Yes. The page runs the o200k_base (OpenAI) in your browser, the same tokenization the OpenAI API applies, so counts are exact for plain text input.