GPT‑5.4 mini and nano

In plain words

GPT-5.4 mini and nano are fast and efficient AI models optimized for coding and agentic workflows. Available through ChatGPT, API, and Codex, these models enable developers to build responsive AI systems for coding tasks, subagents, and multimodal applications. The mini version offers double the speed of standard GPT-5.4, while nano provides the lowest-cost option. Both models include computer use, web search, and large context windows designed for real-world, high-scale execution.

written from the facts on this page · September 2026

From the sources

GPT-5.4 brings powerful reasoning, coding, and agentic workflows into one frontier model, now live in ChatGPT, API, and Codex. With GPT-5.4 mini (2x faster) and nano (lowest cost), build responsive AI systems for coding, subagents, and multimodal tasks. Featuring computer use, web search, and massive context, it’s designed for real-world, high-scale execution.

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