MODEL LINEAGE
中文
Model index
OpenAI·GPT

GPT-5.3 Instant

A GPT-5.3 update for everyday conversation, focused on fewer unnecessary refusals, better search accuracy, and smoother writing.

LegacyLanguageMultimodalWeights not released
MODEL NUMBER060
First public date
2026-03-03
Organization
OpenAI
Family
GPT
01

Specifications

Only published specifications are shown.

Context
128,000 tokens↗
Maximum output
16,384 tokens↗
Input modalities
Text · Image
Open weights
No
Status
Legacy
02

Overview

Release dates

— GPT-5.3 Instant became ChatGPT’s everyday fast model and entered the API. ↗

03

Specifications alongside predecessor

Compared with GPT-5.2 ↗

PreviousGPT-5.2— · 400K ctx
CurrentGPT-5.3 Instant— · 128K ctx
04

Architecture & capabilities

Model capabilities

ConversationWriting

Connected tools

Web search
05

Release history

General release

GPT-5.3 Instant became ChatGPT’s everyday fast model and entered the API.

View source
06

Related models

Select a card to view the related model.

PredecessorGPT-5.2View details →
07

Sources

01
GPT-5.3 InstantOpenAI · Published 2026-03-03
Official · Verified02
OpenAI API model specificationsOpenAI · Checked 2026-09-07
Official · Verified
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