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Coding vv5.3 2026 Rank: #553

ChatGPT Codex ✓

A cloud-based software engineering agent for codebase questions.

Source rating 5.0 (1) 1.2k views 17 saves Freemium
Software Engineering Programming Assistance Codebase Management
More categories (4)
AI Technology Cloud-Based AI For Development Coding
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Free + from $20 USD / month

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Verdict

A quick read before you dig into the full page.

Best if
A cloud-based software engineering agent for codebase questions
Skip if
Limited coding languages support
Pick this when
Cloud-based software engineering

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Overview

Codex is a sophisticated AI tool designed to streamline and enhance software engineering tasks. It operates in the cloud, making it highly accessible and reliable for different applications.

Codex functions as an engineering agent that can offer expert answers to codebase-related queries. Its capability is further extended to the execution of code, facilitating seamless development processes.

Codex also has the unique ability to draft pull requests, thereby assisting in successful version control and codebase management. This tool is integrated with the ChatGPT platform, a powerful AI technology that offers users the additional benefit of a conversational interface.

This allows users to interact with Codex more intuitively, exploring ideas and finding solutions at a faster pace. Codex is available to users enrolled in ChatGPT Plus, Pro, Business, Enterprise, and Edu plans.

Its capabilities to interact, understand, and respond to user needs intuitively make it a practical resource for modern software development processes.

ChatGPT Codex website

Access & connections

Where you can use ChatGPT Codex, and what it plugs into.

Platforms

Web iOS Android CLI

Integrations

Make

Capabilities

What this tool accepts, produces, and is strongest at.

Input

  • Text

Output

  • Code

Highlights

  • Agents

Supported features

  • Agents
  • Code Assistant
  • App Builder
  • SVG
  • Data Analysis
  • CLI

Models

Coding

GPT 5.3 Codex Spark GPT 5.3 Codex

Pros & cons

Pros

  • Cloud-based software engineering
  • Accessible and reliable
  • Expert answers to codebase-related queries
  • Execution of code
  • Facilitates seamless development processes
  • Ability to draft pull requests
  • Assists in version control
  • Integrated with ChatGPT platform
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  • Offers conversational interface
  • Intuitive interaction
  • Quick solution finding
  • Available on multiple ChatGPT plans
  • Understands and respond to user needs
  • Practical for modern software development

Cons

  • Subscription-based access
  • Limited to ChatGPT platform
  • Reliance on cloud connectivity
  • No offline mode
  • Not suitable for sensitive code
  • Limited coding languages support
  • Potential latency in response times
  • Dependent on user's clear instructions

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Releases 5

ChatGPT Codex v5.3 Feb 5, 2026 Current

Faster inference aimed at improving the interactive loop while keeping high-end capability.

Combines frontier coding performance with stronger general reasoning and professional knowledge in one Codex model.

Better for long-running tasks that mix research, tool use, and complex execution.

More steerable while it works, so you can redirect mid-task without it dropping context.

Positioned as the new top recommended Codex model across Codex surfaces.

ChatGPT Codex v5.2 Dec 18, 2025

Stronger long-horizon work via context compaction so it can push through longer tasks without losing the thread.

Better at large code changes like refactors and migrations.

Improved Windows environment performance for dev workflows that run and test on Windows.

Significantly stronger cybersecurity capability emphasis for secure coding and defensive workflows.

Upgraded “most intelligent coding model” positioning for agentic coding depth.

ChatGPT Codex v5.1 Sep 23, 2025

Better tuned specifically for the GPT-5.1 generation while keeping the Codex optimization focus.

Keeps the same “rolling snapshot” behavior, updated regularly rather than version-locked.

Stays centered on Codex environments and agentic coding rather than general chat.

Maintains multimodal input support (text plus images) for coding workflows.

Continues to be served via the Responses API (Codex-first API surface).

ChatGPT Codex v5 Sep 15, 2025

Agentic coding model tuned for Codex-style environments (multi-step coding, tool workflows).

Uses the Responses API (Codex-tuned, not the general chat model).

Supports both text and image input for coding work (for example UI screenshots).

Designed to be a regularly updated snapshot rather than a fixed, one-time weights drop.

Positioned as a general-purpose “default” Codex model for coding tasks.

Initial release May 16, 2025
Initial release of ChatGPT Codex.

FAQ 12

What is the main purpose of Codex?
The main purpose of Codex is to streamline and enhance software engineering tasks. It is designed to answer codebase-related questions, execute code and draft pull requests, thereby assisting in software development processes.
How does Codex assist in software engineering tasks?
Codex assists in software engineering tasks by being a cloud-based tool that provides expert answers to codebase-related questions and executes code. Moreover, Codex even drafts pull requests, thus playing a pivotal role in version control and codebase management.
What are the benefits of Codex being a cloud-based tool?
Being a cloud-based tool enables Codex to be highly accessible and reliable. It can be used from any location over the internet and being in the cloud also guarantees high uptime, thus making it highly reliable for various applications.
Can Codex provide answers to codebase-related queries?
Yes, Codex is capable of providing expert answers to codebase-related queries.
How does Codex facilitate the execution of code?
Codex facilitates the execution of code by being a cloud-based agent that can perform this task. It thus streamlines the software development process making the task more seamless for users.
What is Codex's role in managing version control and codebase?
Codex's role in managing version control and codebase is central. By having the ability to draft pull requests, Codex helps maintain the versions of the codebase effectively.
What is unique about Codex's ability to draft pull requests?
What's unique about Codex's ability to draft pull requests is that it is an AI-powered tool that operates autonomously. This autonomous drafting of pull requests assists in successful version control and codebase management.
How does ChatGPT play a role in Codex's functionality?
ChatGPT enhances the functionality of Codex by offering a powerful conversational interface. This allows users to interact more intuitively with Codex, thus making the process of exploring ideas and finding solutions faster and more efficient.
What is the advantage of the conversational interface in Codex?
The advantage of the conversational interface in Codex is that it provides an intuitive and human-like interaction for the users. This allows users to easily interact, ask questions, and find solutions thereby accelerating their tasks.
Which users are eligible to use Codex?
Codex is available to users who are enrolled in the following subscription plans: ChatGPT Plus, Pro, Business, Enterprise, and Edu.
Is Codex part of the ChatGPT Plus, Pro, Business, Enterprise and Edu plans?
Yes, Codex is part of the ChatGPT Plus, Pro, Business, Enterprise, and Edu plans.
How does Codex interact, understand, and respond to user needs?
Codex interacts, understands and responds to user needs by employing advanced AI technologies. It uses its AI capabilities to facilitate user queries, execute code, draft pull requests, and provide interactive solutions.
ChatGPT Codex Free + from $20 USD / month
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