Comprehensive side-by-side LLM comparison
o3-pro offers 139.2K more tokens in context window than o1-preview. o1-preview is $25.00 cheaper per million tokens. o3-pro supports multimodal inputs. Both models have their strengths depending on your specific coding needs.
OpenAI
o1-preview was introduced as an early version of OpenAI's reasoning model series, designed to demonstrate the potential of AI models that engage in extended thinking before responding. Built to solve complex problems through deliberate reasoning processes, it represented an initial step toward more thoughtful and analytical AI systems.
OpenAI
o3-pro was developed as the flagship reasoning model in the o3 family, designed to deliver maximum reasoning depth and reliability for the most challenging analytical tasks. Built for professionals requiring the highest level of thoughtful problem-solving, it extends reasoning capabilities to handle complex multi-step challenges across diverse domains.
9 months newer

o1-preview
OpenAI
2024-09-12

o3-pro
OpenAI
2025-06-10
Cost per million tokens (USD)

o1-preview

o3-pro
Context window and performance specifications
o3-pro
2024-05-31
Available providers and their performance metrics

o1-preview
Azure
OpenAI


o1-preview

o3-pro

o1-preview

o3-pro
o3-pro
OpenAI