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About

GPT-5.3-Codex is OpenAI’s most advanced agentic coding model, designed to handle complex professional work on a computer. It combines frontier-level coding performance with advanced reasoning and real-world task execution. The model is faster than previous Codex versions and can manage long-running tasks involving research, tools, and deployment. GPT-5.3-Codex supports real-time interaction, allowing users to steer progress without losing context. It excels at software engineering, web development, and terminal-based workflows. Beyond code generation, it assists with debugging, documentation, testing, and analysis. GPT-5.3-Codex acts as an interactive collaborator rather than a single-turn coding tool.

About

An open source, terminal-based AI coding engine that helps you complete large tasks, work around bad output, and maximize productivity. Plandex uses long-running agents to complete tasks that span multiple files and require many steps. It breaks up large tasks into smaller subtasks, then implements each one, continuing until it finishes the job. It helps you churn through your backlog, work with unfamiliar technologies, get unstuck, and spend less time on the boring stuff. Changes are accumulated in a protected sandbox so that you can review them before automatically applying them to your project files. Built-in version control allows you to easily go backwards and try a different approach. Branches allow you to try multiple approaches and compare the results.

Platforms Supported

Windows
Mac
Linux
Cloud
On-Premises
iPhone
iPad
Android
Chromebook

Platforms Supported

Windows
Mac
Linux
Cloud
On-Premises
iPhone
iPad
Android
Chromebook

Audience

GPT-5.3-Codex is built for software engineers, product teams, researchers, and technical professionals who need an interactive AI agent capable of executing complex, end-to-end computer-based work

Audience

Users looking for a solution that helps build complex software using AI

Support

Phone Support
24/7 Live Support
Online

Support

Phone Support
24/7 Live Support
Online

API

Offers API

API

Offers API

Screenshots and Videos

Screenshots and Videos

Pricing

No information available.
Free Version
Free Trial

Pricing

No information available.
Free Version
Free Trial

Reviews/Ratings

Overall 0.0 / 5
ease 0.0 / 5
features 0.0 / 5
design 0.0 / 5
support 0.0 / 5

This software hasn't been reviewed yet. Be the first to provide a review:

Review this Software

Reviews/Ratings

Overall 0.0 / 5
ease 0.0 / 5
features 0.0 / 5
design 0.0 / 5
support 0.0 / 5

This software hasn't been reviewed yet. Be the first to provide a review:

Review this Software

Training

Documentation
Webinars
Live Online
In Person

Training

Documentation
Webinars
Live Online
In Person

Company Information

OpenAI
Founded: 2015
United States
openai.com

Company Information

Plandex
plandex.ai

Alternatives

Claude Code

Claude Code

Anthropic

Alternatives

Claude Opus 4.5

Claude Opus 4.5

Anthropic
Claude Opus 4.6

Claude Opus 4.6

Anthropic
Cline

Cline

Cline AI Coding Agent

Categories

Categories

Integrations

GitHub
OpenAI
C
ChatGPT Enterprise
Cursor
Elixir
Gemini 1.5 Pro
Gemini 2.0
Gemini Nano
GitHub Copilot
HTML
Java
Microsoft Foundry
Python
Ruby
SQL
TypeScript
Verdent
Visual Studio Code
Windsurf Editor

Integrations

GitHub
OpenAI
C
ChatGPT Enterprise
Cursor
Elixir
Gemini 1.5 Pro
Gemini 2.0
Gemini Nano
GitHub Copilot
HTML
Java
Microsoft Foundry
Python
Ruby
SQL
TypeScript
Verdent
Visual Studio Code
Windsurf Editor
Claim GPT-5.3-Codex and update features and information
Claim GPT-5.3-Codex and update features and information
Claim Plandex and update features and information
Claim Plandex and update features and information