Sensible for high-volume classification and sub-agents, though nano is due to go on 1 April 2027 in favour of GPT-6 Luna.
Kenning's take
What it does
GPT-5.4 mini and GPT-5.4 nano are smaller versions of GPT-5.4 for tasks where speed and cost matter, such as classification, data extraction and sub-agents. Mini supports tool search and computer use; nano is the cheapest of the pair. Both are in the API; nano is due to be removed on 1 April 2027 in favour of GPT-6 Luna.
- 400K-token context window
- Mini supports computer use and tool search
- Nano aimed at classification and extraction
- Text and image input
Who it suits. Developers running large volumes of simple requests or many sub-agents.
Key facts
- Category
- AI models
- Part of
- ChatGPT
- Made by
- OpenAI
- Based in
- United States
- Released
- 17 March 2026
- How to get it
- OpenAI API (gpt-5.4-mini and gpt-5.4-nano); mini left Codex for ChatGPT sign-in on 31 August 2026
- Works on
- API
- In the UK
- Yes
- API price
- mini $0.75 per million input tokens and $4.50 output; nano $0.20 input and $1.25 output
FAQ
When were GPT-5.4 mini and nano released?
OpenAI added them to the API on 17 March 2026.
How much does GPT-5.4 nano cost?
$0.20 per million input tokens and $1.25 per million output tokens.
Facts from the maker's own pages and the sources listed. Checked 2026-10-11.
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