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Important because it marked OpenAI moving from general chat models toward models optimized for deliberate problem solving.

Researchers, developers, technical operators, and teams working on problems that benefit from deeper reasoning rather than fast chat alone.

Clear use cases in code, math, science, and multi-step analytical work.

Reasoning models were early and more expensive, with product limits and latency tradeoffs.

The launch created a new public category for reasoning models and became a benchmark comparison point for later 2025 models.

Official site

https://openai.com/index/introducing-openai-o1-preview/ https://cdn.openai.com/o1-preview-system-card-20240917.pdf