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OpenAI has launched GPT-5.4 mini and nano, small models optimized for coding and subagents. These models are designed for high-volume tasks and deliver better performance than their predecessors.

GPT-5.4 Mini and Nano Models from OpenAI
The new models, GPT-5.4 mini and nano, offer significant improvements in speed and efficiency. The mini model is over twice as fast as GPT-5 mini and approaches the performance of the larger GPT-5.4 model in several evaluations.
These models are especially useful in coding and tasks that require quick responses. They give developers the ability to handle simpler tasks cost-effectively, which can improve workflow in programming.
Source: OpenAI