ZDNet: OpenAI’s GPT-5.4 mini and nano launch – with near flagship performance at much lower cost . “The latest GPT-5.4 mini model delivers benchmark results surprisingly close to the full GPT-5.4 model while running much faster, signaling a shift toward smaller AI models powering real-world applications.”

https://rbfirehose.com/2026/03/20/zdnet-openais-gpt-5-4-mini-and-nano-launch-with-near-flagship-performance-at-much-lower-cost/