OpenAI: o1

OpenAIID: openai/o1

The latest and strongest model family from OpenAI, o1 is designed to spend more time thinking before responding. The o1 model series is trained with large-scale reinforcement learning to reason using chain of thought. The o1 models are optimized for math, science, programming, and other STEM-related tasks. They consistently exhibit PhD-level accuracy on benchmarks in physics, chemistry, and biology. Learn more in the [launch announcement](https://openai.com/o1).

Pricing per 1M Tokens

Input (Prompt)$15
Output (Completion)$60
Cache Read$7.50
Cache WriteFree
ImageN/A

Specifications

Context Length200K
Max Output Tokens100K
Input ModalitiesText + Image + File
Output ModalitiesText
TokenizerGPT
Instruct TypeN/A
Top Provider Context200K
Top Provider Max Output100K
ModeratedYes

Compare this model

See how OpenAI: o1 stacks up against other models.

vs OpenAI: GPT-5.4 Nanovs OpenAI: GPT-5.4 Minivs OpenAI: GPT-5.4 Provs OpenAI: GPT-5.4vs OpenAI: GPT-5.3 Chat

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Last updated: March 23, 2026

First tracked: March 23, 2026