What is GPT-5.3-Codex?

GPT-5.3-Codex is an autonomous coding agent by OpenAI that can work independently on complex software projects, handling coding, testing, and deployment.

How does it perform compared to other AI models?

It currently outperforms all other models on industry benchmarks including SWE-Bench Pro and Terminal-Bench 2.0, and it is 25% faster.

Can I interact with the agent while it works?

Yes, you can interact with GPT-5.3-Codex in real time while it is actively coding and testing your applications.

How do I get access to the application?

Interested users can join the Codex app waitlist through the official OpenAI website.

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Developer Tools

Free

GPT-5.3-Codex

An autonomous coding agent that codes, tests, and deploys applications in real time. It leads SWE-Bench Pro and Terminal-Bench 2.0 rankings while being 25% faster than other models.

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Rating

Reviews

Upvotes

3 months ago

Listed

Developer Tools

AI Coding Assistant

Autonomous Agents

Software Development

Coding Agent

OpenAI

Programming

Web Development

DevOps

Tool information

Provider

OpenAI

Platforms

Web

Languages

English

Added to directory

3 months ago

Last updated

about 1 month ago

Rating

Not available

Pricing

Free

About GPT-5.3-Codex

What the tool does and who it's for

GPT-5.3-Codex is an advanced autonomous coding agent designed to handle complex software projects for extended durations. It functions as a comprehensive developer tool that allows users to interact in real time while the AI manages the entire lifecycle of an application, including writing code, performing tests, and executing deployments. According to its performance benchmarks, it leads the industry by outperforming all existing models on SWE-Bench Pro and Terminal-Bench 2.0. Additionally, it offers a significant efficiency boost, operating 25% faster than previous iterations.

Key capabilities

Autonomous coding capabilities for complex, multi-hour projects

Real-time user interaction during the development process

Automated software testing and quality assurance

End-to-end application deployment

Top-tier performance on SWE-Bench Pro benchmarks

High-speed execution, performing 25% faster than competitors

Advanced terminal integration via Terminal-Bench 2.0 standards

Full-stack code generation and management

Pricing

Free — plans below

Free

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