OpenAI's first reasoning model — it 'thinks' before answering, crushing math, science, and code benchmarks.
o1 was OpenAI's breakthrough 'deliberative' model. Instead of blurting the first token, it spends compute internally reasoning through the problem — which is why it leaps ahead on competition math, PhD-level science, and tricky coding. It's slower, but when correctness matters, it shows.
Who it's for: Researchers, competitive programmers, and anyone solving hard quantitative or logical problems where a wrong answer is costly.
Internal chain-of-thought before responding.
Top scores on Olympiad and PhD-level benchmarks.
Excellent on complex algorithmic problems.
Traders time for accuracy — not chat speed.
When the problem is hard and wrong answers are expensive, o1 earns its keep. For everyday chat, GPT-4o or o4-mini is faster and cheaper.