o1-preview was OpenAI's first public release of the o1 reasoning model series, made available for early testing before the full o1 launch. It uses chain-of-thought reasoning internally — spending more inference time thinking through problems before producing an answer — which yields substantially better results on complex math, science, and multi-step logical tasks compared to standard GPT-4-class models.
As a preview release, it gave developers and researchers early access to test o1's reasoning capabilities with the understanding that it was not yet the final, fully optimized version. It is best suited for difficult problems where answer quality matters more than response speed, including competition-style math, formal proofs, and rigorous analytical reasoning.
Key Features
Internal chain-of-thought reasoning for improved accuracy on complex problems
Strong performance on multi-step math, science, and logical reasoning tasks
Better handling of ambiguous or under-specified problems than standard GPT-4
Reduced hallucination on tasks requiring careful step-by-step deduction
Suitable for technical domains such as coding challenges and formal analysis
Ideal Use Cases
Advanced mathematics problem solving and proof verification
Complex coding challenges and algorithm design
Scientific reasoning and hypothesis evaluation
Legal and analytical tasks requiring careful multi-step logic
Example Prompts for o1-preview
Technical Specifications
| Provider | OpenAI |
| Category | Reasoning |
| Modality | Text -> Text (reasoning) |
Frequently Asked Questions
Try o1-preview now
Start using o1-preview instantly — 100 free credits, no credit card required. Access 750+ AI models through one platform.