One of the well-known Models by OpenAI using Chain of Thought techniques.
"We are introducing OpenAI o1, a new large language model trained with reinforcement learning to perform complex reasoning. o1 thinks before it answers—it can produce a long internal chain of thought before responding to the user." [e2e35a]

o1

o3

2025, Feb 01.
I just tried o3 mini
The Prime Time, YouTube
https://youtu.be/PoeFxGzPpXE?si=en_bfy--cHZLODu-
https://youtu.be/CqpDXeMIY1Q?si=tvD2FBtNlOZNpfqI
https://youtu.be/zRPBovmV8F8?si=txOrsdT89Iv3kzbP
https://youtu.be/j0Qz2pFScsk?si=dYcVvctwpLjhy8jf
https://youtu.be/GbnglT5XkNQ?si=Lx2_VGSfDihUmi55

Footnotes


[e2e35a] 2024, Sep 12. [Learning to reason with LLMs](# Learning to reason with LLMs). OpenAI Blog.