OpenAI: o3 Token Counter
Count tokens, estimate API costs and check the context window for OpenAI: o3 by OpenAI — all computed locally in your browser.
Runs locally — nothing is uploaded
How OpenAI: o3 compares
Open side-by-side comparison| Model | Provider | Input / 1M | Output / 1M | Context | Out/In ratio |
|---|---|---|---|---|---|
| OpenAI: o3 | OpenAI | $2.00 | $8.00 | 200,000 | 4.00× |
| OpenAI: GPT-4.1 | OpenAI | $2.00 | $8.00 | 1,047,576 | 4.00× |
| OpenAI: GPT-5.6 Sol | OpenAI | $2.00 | $10.00 | 1,050,000 | 5.00× |
| Anthropic: Claude Sonnet 5 | Anthropic | $2.00 | $10.00 | 1,000,000 | 5.00× |
Data source: OpenRouter model API (aggregates official prices, may include platform markup). Rates change - always verify on the official provider page. Last updated 2026-08.
How to Use
This free online token counter counts tokens for OpenAI: o3, a large language model by OpenAI. The tokenizer badge in the tool shows whether the count is exact or estimated: OpenAI-family models are counted with the official tokenizer, while other providers have no public JavaScript tokenizer and are marked as estimates.
OpenAI: o3 offers a context window of 200,000 tokens. Open the Context tab to see how much of the window your prompt uses and how many copies of your text fit. Pricing for OpenAI: o3 is 2 USD per 1M input tokens and 8 USD per 1M output tokens; open the Cost tab to estimate the cost of your request in USD and CNY.
Prices are sourced from OpenRouter and last updated 2026-08. Always confirm current rates with the provider's official pricing page before making a purchasing decision. All counting and estimation runs locally in your browser — your text is never uploaded.