Question 1

How much does GPT-5 Nano cost?

Accepted Answer

GPT-5 Nano costs $0.05 per 1 million input tokens and $0.4 per 1 million output tokens. This pricing is set by OpenAI.

Question 2

What tokenizer does GPT-5 Nano use?

Accepted Answer

GPT-5 Nano 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 GPT-5 Nano's context window?

Accepted Answer

GPT-5 Nano supports a context window of 128K tokens (128,000 tokens). The maximum output length is 16K tokens.

Question 4

How does GPT-5 Nano compare to other models?

Accepted Answer

You can compare GPT-5 Nano'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 GPT-5 Nano?

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 GPT-5 Nano using the o200k_base tokenizer.

Model	Input / 1M	Output / 1M	Context	Max Output
GPT-5 Nano	$0.05	$0.4	128K	16K
GPT-4.1 Nano	$0.1	$0.4	1.0M	33K
Gemini 2.5 Flash-Lite	$0.1	$0.4	1.0M	66K
Mistral Small	$0.1	$0.3	128K	4K

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