On Tuesday, OpenAI released two of its most powerful small models—GPT-5.4 mini and GPT-5.4 nano. These models significantly narrow the performance gap with flagship models at lower latency and cost. GPT-5.4 mini comprehensively surpasses its predecessor, GPT-5 mini, in key areas such as programming, reasoning, multimodal understanding, and tool invocation. It operates over twice as fast and performs close to the larger GPT-5.4 in benchmark tests like SWE-Bench Pro.
