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What is GPT-5.3-Codex?

GPT-5.3-Codex represents a major leap in agentic AI for software and knowledge work. It is designed to reason, build, and execute tasks across an entire computer-based workflow. The model combines the strongest coding performance of the Codex line with professional reasoning capabilities. GPT-5.3-Codex can handle long-running projects involving tools, terminals, and research. Users can interact with it continuously, guiding decisions as work progresses. It excels in real-world software engineering, frontend development, and infrastructure tasks. The model also supports non-coding work such as documentation, data analysis, presentations, and planning. Its improved intent understanding produces more complete and polished outputs by default. GPT-5.3-Codex was used internally to help train and deploy itself, accelerating its own development. It demonstrates strong performance across benchmarks measuring agentic and real-world skills. Advanced security safeguards support responsible deployment in sensitive domains. GPT-5.3-Codex moves Codex closer to a general-purpose digital collaborator.

What is Agentastic.dev?

Agentastic.dev is a robust development environment specifically designed for macOS users who leverage AI coding agents in their workflow. It combines essential tools such as an editor, terminal, browser, Git capabilities, and agent sessions, allowing developers to run multiple coding agents while managing tasks efficiently through Git worktrees or containers. Users have the ability to review code alterations, engage in code assessments, and test their applications directly within the integrated browser, all while launching work based on prompts, specifications, or pertinent issues from collaborative platforms. Additionally, the service offers a rich array of command-line tools tailored for coding agents and facilitates the creation of personalized terminal-based agents. The workspace is versatile enough to operate on local machines, SSH-enabled development systems, or through compatible cloud services. An accompanying iPhone app enables users to monitor sessions and provide input to agents as necessary, adding to the convenience of the development process. The macOS application is available free of charge, while fees apply for subscriptions and API interactions with third-party agents, offering a flexible pricing structure that caters to diverse development requirements. This innovative solution not only simplifies the programming experience but also significantly improves collaboration among software engineers. Through its comprehensive features, Agentastic.dev is poised to become an invaluable asset in the toolkit of modern developers.

Media

Media

Integrations Supported

GitHub
ChatGPT
ChatGPT Plus
Cheaper Inference
Devin Desktop
Elixir
HTML
Java
JetBrains Junie
Microsoft Foundry
Oh My OpenAgent
OpenAI Codex
PHP
PrivatClaw
R
Scala
Verdent
Visual Studio Code

Integrations Supported

GitHub
GitLab
Sentry

API Availability

Has API

API Availability

Pricing Information

Pricing not provided

Pricing Information

$0
The macOS app is free to download and use. Third-party coding-agent subscriptions and API usage are billed by their respective providers.
Free Version

Supported Platforms

SaaS

Supported Platforms

iPhone
Mac
Linux

Customer Service / Support

Web-Based Support

Customer Service / Support

Not specified

Training Options

Documentation Hub

Training Options

Not specified

Company Facts

Organization Name

OpenAI

Date Founded

2015

Company Location

United States

Company Website

openai.com

Company Facts

Organization Name

Agentastic

Company Website

www.agentastic.dev/

Categories and Features

Agentic AI

Not specified

AI Coding Agents

Not specified

AI Coding Models

Not specified

AI Models

Not specified

Categories and Features

AI Coding Agents

Not specified

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Popular Alternatives

No Alternatives
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