OpenAI is releasing OpenAI o3-mini, a new, cost-efficient reasoning model with strong STEM capabilities, particularly in science, math, and coding. It supports developer features, streaming, and three reasoning effort options, making it production-ready and accessible to ChatGPT Plus, Team, and Pro users. OpenAI o3-mini is optimized for speed and accuracy, outperforming its predecessor on various STEM evaluations and delivering responses 24% faster.