OpenAI is scaling its latest models down to hit a different target, faster responses and much lower costs. The new GPT-5.4 mini and nano are built for developers who care more about responsiveness than squeezing out every last bit of reasoning power.
Both models are available starting today. GPT-5.4 mini runs more than twice as fast as its predecessor while staying close to the full GPT-5.4 on key benchmarks. GPT-5.4 nano takes that further, focusing on simpler tasks like classification and data extraction where efficiency matters most.
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This approach fits apps where speed shapes the experience. Coding assistants, background agents, and real-time vision tools depend on quick feedback, and in those cases a slightly smaller model often delivers a better overall result.
OpenAIHow much performance you actually lose
The performance gap between models is narrower than you might
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