The premium reasoning tier — extended thinking for research, proofs, and hard code.
o1-pro is the high-compute variant of o1, OpenAI's first reasoning model. It spends more tokens thinking through complex problems — proofs, competitive programming, and research questions — before producing an answer. It has since been succeeded by o3-pro in raw benchmark performance, but o1-pro remains a capable, stable choice for deep reasoning work.
Who it's for: Researchers, graduate students, and engineers who need reliable multi-step reasoning and have the budget for premium compute.
Spends significantly more tokens reasoning before answering, reducing early-give-up errors.
Strong on AIME, MATH, and Olympiad-style problems where step-by-step proof matters.
Handles hard algorithmic problems with multi-step code generation and self-checking.
Reliable function calling within reasoning chains for agentic workflows.
o1-pro was a breakthrough for reasoning models and remains a solid, stable choice for deep multi-step work. If you're price-insensitive and need reliability over bleeding-edge scores, it's dependable. New users should consider o3-pro first unless you specifically need o1-pro's proven stability. Pair with GPT-4o or Claude for routine tasks.