o3 Pro applies maximum reasoning compute to the o3 architecture, delivering the deepest chain-of-thought analysis available for the most demanding mathematical, scientific, and analytical problems.
import { streamText } from 'ai'
const result = streamText({ model: 'openai/o3-pro', prompt: 'Why is the sky blue?'})o3 Pro was released on April 16, 2025 as the premium tier of the o3 reasoning model family. It applies maximum compute to each reasoning request, enabling the deepest chain-of-thought analysis available from OpenAI.
The additional compute produces more thorough deliberation: the model explores more solution paths, checks its work more exhaustively, and arrives at conclusions with higher confidence. On the hardest mathematical, scientific, and analytical problems, this translates to measurably better accuracy.
The tradeoff is cost and latency. o3 Pro is the most expensive model in the o3 family and takes the longest to respond. For problems where the difference between good and best matters, that investment is justified. For standard reasoning tasks, o3 or o3-mini provide sufficient quality at substantially lower cost.