MODEL LINEAGE
中文
Model index
OpenAI·OpenAI o-series

o3

A reasoning model combining visual reasoning and tool use, released in ChatGPT and the API.

LegacyReasoningCodingMultimodalWeights not released
MODEL NUMBER276
First public date
2025-04-16
Organization
OpenAI
Family
OpenAI o-series
01

Specifications

Only published specifications are shown.

Context
200,000 tokens↗
Maximum output
100,000 tokens↗
Input modalities
Text · Image
Output modalities
Text
Open weights
No
Status
Legacy
02

Overview

Release dates

— OpenAI launched the o3 and o4-mini reasoning models together. ↗

03

Specifications alongside predecessor

Compared with o1 ↗

Previouso1— · 200K ctx
Currento3— · 200K ctx
04

Architecture & capabilities

05

Release history

General release

OpenAI launched the o3 and o4-mini reasoning models together.

View source
06

Related models

Select a card to view the related model.

Predecessoro1View details →
07

Sources

01
Introducing o3 and o4-miniOpenAI · Published 2025-04-16 · Checked 2026-09-03
Official · Verified02
OpenAI API model specificationsOpenAI · Checked 2026-09-07
Official · Verified
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