OpenAI has launched GPT-5.4 mini and nano, the smallest and quickest variants of its GPT-5.4 family. Designed as workhorse models for coding and data‑processing tasks, the mini model is reported to be more than twice as fast as its predecessor on coding, reasoning, and tool‑use benchmarks, while still approaching the performance of the full GPT-5.4. The nano model targets even lighter workloads such as classification and data extraction. Both models are available through OpenAI’s API, with the mini model also integrated into Codex and the ChatGPT "Thinking" feature, positioning OpenAI against rivals like Anthropic’s Claude Code. Read more →