GPT-5 Mini is a faster, cost-efficient version of GPT-5 designed for well-defined tasks requiring moderate reasoning. Positioned between GPT-5 Nano and the full GPT-5, it offers a compelling balance of capability and efficiency with stronger comprehension and instruction following than Nano while maintaining excellent speed. Its expanded reasoning tokens support more complex multi-step workflows, making it suitable for production applications that need reliable performance without the cost of the flagship model.