What is ChatGPT o1
ChatGPT o1 is a series of models from OpenAI released in September 2024. It includes two versions: o1-preview and o1-mini. The main goal of the new release is to solve complex problems in science, programming, and mathematics, where it's not enough to simply reproduce information — you need to build a chain of reasoning. Unlike ordinary chatbots, this model spends noticeably more time "thinking through" its answer before presenting it to the user.
The first thing that stands out is its impressive benchmark results. For example, on the International Mathematical Olympiad tests, the model achieved about 83% accuracy, while its predecessor GPT-4o managed only 13%. Of course, this doesn't mean the neural network solves olympiad problems like a human, but the level of analytical ability is genuinely high.

How it works
The secret lies in the model's training approach and architecture. The developers used reinforcement learning to teach the model to build internal reasoning steps before giving a final answer. In essence, this is the implementation of the "think first, then answer" principle. The process resembles a rough draft: the model generates an invisible chain of thought and then formulates its answer based on it.
Thanks to this, the model handles tasks that require self-checking and logic much better. It can spot its own mistakes and adjust its line of reasoning. The engineers also strengthened safety: the model follows rules more strictly and is noticeably more resistant to jailbreak attempts, that is, attempts to bypass restrictions.
Use cases
This model is most often used where accuracy and consistency matter. Here are a few typical examples:
- Science and engineering — help with calculations, modeling, and interpreting experimental results.
- Programming — writing code, debugging, refactoring, and automating routine tasks.
- Data analysis — processing spreadsheets, identifying patterns, and preparing reports.
- Creativity — generating ideas, plots, poems, and even entire works.
At the same time, the model retains regular conversational skills: it understands context, picks up on nuances and humor, so interacting with it feels natural. It's not just a "calculator" but a full-fledged assistant that can both crack a joke and write code.

Pricing and access options
OpenAI offers two versions: o1-preview and o1-mini. They are designed for different tasks. o1-preview is the full model with maximum reasoning capabilities, but it is slower and more expensive. o1-mini is a compact and cost-efficient alternative: it falls only slightly short of the larger version in math and coding but costs about 80% less. So for everyday work with code or formulas, it's often more economical to choose o1-mini, and save o1-preview for complex research tasks.
Thus, users have a choice: pay less and get quick answers to technical questions, or invest more resources in truly complex analytical problems. Either way, the model marks a new stage in the development of AI assistants, emphasizing not generation speed but depth of understanding.



