Last updated 07-24-2026
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OpenAI o1
OpenAI o1 is a series of language models built to spend more time reasoning before responding. Instead of answering immediately, o1 models work through problems step by step, which helps on math, coding, science, and other tasks that need careful thought.
You can use o1 through ChatGPT Plus on the web and mobile apps, or through the OpenAI API and Playground for developers. OpenAI also publishes research on how these models learn to reason, along with a system card covering safety and capabilities.
o1 is aimed at harder questions where accuracy matters more than speed. For quick everyday prompts, OpenAI's faster models are usually a better fit.
Spends additional compute on internal reasoning before producing a final answer
Available in ChatGPT Plus and through the OpenAI API and Playground
Designed for complex math, coding, science, and multi-step problem solving
Backed by published research on learning to reason with LLMs
Ships with an OpenAI o1 System Card covering safety and deployment details
Stronger performance on complex reasoning, math, and coding tasks than faster ChatGPT models.
Available through both ChatGPT Plus and the OpenAI API for consumers and developers.
Backed by published research and a system card on safety and capabilities.
Slower and more expensive than standard ChatGPT models for simple prompts.
Specific per-token pricing for o1 is not listed on the o1 product page itself.
What is OpenAI o1?
OpenAI o1 is a series of AI models designed to spend more time thinking before they respond, improving performance on complex reasoning tasks.
How can I use OpenAI o1?
You can try o1 in ChatGPT Plus or access it through the OpenAI API and Playground for developers.
What makes OpenAI o1 different from other ChatGPT models?
o1 models use extended internal reasoning to work through problems step by step, which helps on tasks that need careful analysis rather than quick replies.
Is OpenAI o1 available through the API?
Yes. Developers can access o1 models through the OpenAI API and Playground, including o1-mini variants.
What kinds of tasks is OpenAI o1 best for?
o1 is best suited for complex questions in math, coding, science, and other domains that benefit from multi-step reasoning.