Question 1

How much does o1 cost?

Accepted Answer

o1 costs $15 per 1 million input tokens and $60 per 1 million output tokens. This pricing is set by OpenAI.

Question 2

What tokenizer does o1 use?

Accepted Answer

o1 uses the o200k_base tokenizer. This is OpenAI's latest tokenizer, optimized for efficiency with a vocabulary of ~200,000 tokens.

Question 3

What is o1's context window?

Accepted Answer

o1 supports a context window of 200K tokens (200,000 tokens). The maximum output length is 100K tokens.

Question 4

How does o1 compare to other models?

Accepted Answer

You can compare o1's pricing and capabilities against other LLMs in the comparison table above, or visit the full pricing page for a side-by-side view of all models.

Question 5

How do I count tokens for o1?

Accepted Answer

Use the token counter at the top of this page or visit the homepage calculator. Paste your text and it will show the exact token count and cost for o1 using the o200k_base tokenizer.

Model	Input / 1M	Output / 1M	Context	Max Output
o1	$15	$60	200K	100K
GPT-5.4	$2.5	$15	1.1M	128K
Claude Opus 4.6 Adaptive	$5	$25	200K	32K
Grok 4	$3	$15	2.0M	16K

o1 Token Counter & Pricing

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