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ChatGPT Codexv5.3
Coding
Freemium

ChatGPT Codexv5.3

A cloud-based AI software engineering agent that navigates repositories, executes code, and drafts pull requests to automate complex development tasks.

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Rating
0
Reviews
0
Upvotes
3 months ago
Listed
AI Software Engineer
Code Refactoring
Automated Testing
GitHub Integration
Agentic AI
DevOps Automation
Codebase Search
Terminal Execution
Tool information
Provider
OpenAI
Platforms
Web
Windows
macOS
CLI
GitHub
Languages
Python
JavaScript
TypeScript
Go
Ruby
Swift
C++
Java
Rust
PHP
API Available
Yes
Added to directory
3 months ago
Last updated
about 1 month ago
Rating
Not available
Pricing
Freemium

About ChatGPT Codexv5.3

What the tool does and who it's for

ChatGPT Codexv5.3 is an advanced, agentic software engineering platform by OpenAI that goes beyond simple code completion. It operates as a full-cycle engineering agent capable of navigating entire repositories, executing terminal commands, and managing complex development workflows. Built on the GPT-5.3-Codex model architecture, it features a massive 400K context window to analyze large codebases and can run background tasks in a secure cloud sandbox. The tool integrates directly with GitHub, allowing it to draft pull requests, refactor legacy code across multiple files, and verify changes by running tests locally or in the cloud. It is accessible through a dedicated web interface at chatgpt.com/codex, the ChatGPT app, and a specialized CLI for terminal-based automation.

Key capabilities

Agentic Workflow: Handles multi-step software engineering tasks from planning to PR creation.
Repository Intelligence: Navigates and indexes local or GitHub repositories to understand cross-file dependencies.
Secure Sandboxing: Executes code and runs tests in an isolated cloud environment to verify logic.
Terminal Interaction: Capable of running shell commands, managing Git, and using developer tools via CLI.
AGENTS.md Support: Uses specialized configuration files to follow repository-specific coding standards and rules.
Parallel Orchestration: Can run multiple Codex agents simultaneously on different branches or projects.
Multimodal Input: Supports UI screenshots and images to assist in front-end development tasks.
Context Compaction: Efficiently manages 400K+ token contexts for long-horizon project stability.

Pricing

Freemium — plans below

Free

0

  • Limited access to GPT-5.3-Codex
  • Strict rate limits
  • Basic repository analysis
  • Community support

Plus

Most popular

20

  • Full Codex tool access
  • Higher message limits
  • GitHub connector integration
  • Priority access to GPT-5.5 models

Pro

100

  • 5x usage limits of Plus
  • Enhanced parallel workload support
  • 1M-token context window (select models)
  • Advanced agentic reasoning

Business

20

  • Per seat / billed annually
  • Admin controls and SAML SSO
  • SOC 2 Type II compliance
  • Data excluded from model training

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