o1
Released
o1 is an AI model released by OpenAI on Thursday, Dec 5 2024, 84 days after o1-mini. It has a 200k token context window. Benchmark results (shown below) cover GPQA Diamond.
Get OpenAI releases and AI news.
One email, every other Monday.
API pricing
- InputWhat you pay for everything you send the model — your question, plus any documents or earlier conversation you include with it.
- $15.00
- Cached inputA reduced rate for text you send over and over. If every request starts with the same instructions or the same document, the provider keeps a copy ready and charges less to read it again.
- $7.50
- OutputWhat you pay for the text the model writes back. It is normally the dearer half: producing an answer costs more than reading one.
- $60.00
Benchmarks
About
o1, released December 5, 2024 after a September preview, was the first production reasoning model: instead of answering immediately, it generates a long private chain of thought trained with reinforcement learning before responding. The approach produced dramatic gains on competition mathematics, science, and hard coding problems that had resisted ordinary scaling.
o1 established the test-time-compute paradigm that reshaped the entire industry — within months every major lab shipped a reasoning model, from DeepSeek R1 to Gemini 2.5 Pro to Claude 3.7 Sonnet's extended thinking. Its own line moved fast too: o3-mini arrived in January 2025 and the full o3 in April 2025.
Compare o1 with
Suggested comparisons
Frequently asked questions
o1 was released by OpenAI on Thursday, Dec 5 2024.