o1

Deprecated

OpenAI · December 2024

OpenAI is retiring this model on 23 October 2026. After that date it will not be available for new work.

An early reasoning model: it works through problems step by step. Built for hard problems, not chat or code.

Best for: Deep reasoning
Superseded by: o3

Context window
200,000 tokens
≈ 150,000 words · about 600 pages
Max output
100,000 tokens
≈ 75,000 words in a single answer
Knowledge cutoff
October 2023
its training cutoff

Modalities

TextInput and output
ImageInput only
AudioNot supported
VideoNot supported

Reasoning effort

Low
Medium
High

Features

StreamingSupported
Function callingSupported
Structured outputsSupported
Fine-tuningNot supported

Tools

Web searchNot supported
Image generationNot supported
Hosted shellNot supported
Apply patchNot supported
Tool searchNot supported

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