Introducing GPT-5.4 mini and nano

OpenAI releases GPT-5.4 mini and nano, their most capable small models yet, with mini running 2x faster than GPT-5 mini while approaching GPT-5.4 performance on benchmarks like SWE-Bench Pro. These models target high-volume, latency-sensitive workloads including coding assistants, subagents, and multimodal applications. Directly relevant to engineers building agentic systems where response speed shapes product experience.