MODEL LINEAGE
中文
Model index
OpenAI·GPT

GPT-5.3-Codex

A Codex model extending agentic coding into research, tool use, and end-to-end computer work.

LegacyCodingAgentReasoningWeights not released
MODEL NUMBER058
First public date
2026-02-05
Organization
OpenAI
Family
GPT
01

Specifications

Only published specifications are shown.

Context
400,000 tokens↗
Maximum output
128,000 tokens↗
Input modalities
Text · Image
Open weights
No
Status
Legacy
02

Overview

Release dates

— GPT-5.3-Codex launched across Codex products. ↗

03

Specifications alongside predecessor

Compared with GPT-5.2-Codex ↗

PreviousGPT-5.2-Codex— · 400K ctx
CurrentGPT-5.3-Codex— · 400K ctx
04

Architecture & capabilities

Model capabilities

Long-horizon agentCodingTool use

Connected tools

Computer use
05

Release history

General release

GPT-5.3-Codex launched across Codex products.

View source
06

Related models

Select a card to view the related model.

PredecessorGPT-5.2-CodexView details →VariantGPT-5.3-Codex-SparkView details →Derived modelGPT-5.4View details →
07

Sources

01
Introducing GPT-5.3-CodexOpenAI · Published 2026-02-05
Official · Verified02
OpenAI API model specificationsOpenAI · Checked 2026-09-07
Official · Verified
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