On Tuesday, OpenAI released GPT-5.4 mini and nano, two smaller models designed for tasks that agentic AI systems delegate: codebase searches, file reviews, and parallel subtasks that need to be fast and affordable.
This is the first time OpenAI has launched new mini and nano models for a while. The last release was GPT-5 mini and nano in 2025.
What’s especially interesting here is that, in some areas, the trade-off between using the mini model and full GPT-5.4 isn’t even that high, especially on coding and computer-use benchmarks, all…

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