GPT-5.4 Mini and Nano
Create an agent or open an existing agent in the builder, then follow the steps below. Model and feature availability may depend on your plan.
What it does
Two smaller GPT-5.4 variants joined the selector.
Before this
An addition to the selector. GPT-5.4 and 5.4 Pro shipped earlier the same month; Mini and Nano are the cheap end of that same family, which had no cheap end until then.
Why it matters
For classification, routing, and short replies, Nano does the job at a fraction of the credits — and the quality gap only shows on hard work.
The specs
Both are available on every plan, read text and images, support Actions, and offer Fast ($$) through Smartest ($$$$) reasoning.
- GPT-5.4 Mini
- 400,000-token context, 128,000-token output.
- GPT-5.4 Nano
- 1,000,000-token context, 128,000-token output — a bigger window than Mini, at the lowest price in the family.
Nano is the one that surprises people: on classification, routing, extraction, and short replies the quality gap against a frontier model barely shows, and the credit difference is large enough to change what a high-volume agent costs to run.