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What is Keelen?

Keelen serves as an autonomous coding loop that converts open-ended inquiries into an organized and prioritized development plan. This plan is then broken down into actionable tasks that are development-ready, complete with defined acceptance criteria, and executed within a secure, isolated virtual machine environment using credentials from services such as Claude, Codex, GLM, or Kimi, culminating in either a merged pull request or one held for review based on user preferences. Before any changes are merged, they must pass through a rigorous five-step verification process: an initial red-first test proof, a contextual review by a separate model, execution of the project's test suite on a clean checkout, fulfillment of a CI-green mandate, and a specified review period prior to automated merging. This meticulous approach ensures that no validation checks are bypassed in the quest for a green status, reinforcing the integrity of the development process. Each coding iteration occurs within a temporary, non-root virtual machine that is discarded at the end of the run, adhering to a strict deny-by-default network access policy. Furthermore, the GitHub tokens employed for each operation are restricted to a single repository to enhance security and control. It is important to clarify that Keelen is neither an IDE copilot nor a conversational interface; instead, it is uniquely crafted to automate and optimize the entire coding workflow, focusing on efficiency and reliability in software development. This specialization allows developers to concentrate on higher-level tasks while ensuring code quality and consistency throughout the process.

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.

Media

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Media

Integrations Supported

Integrations Supported

Buda
C++
ChatGPT Enterprise
ChatGPT Plus
Codex Security
Elixir
F#
Go
JetBrains Junie
Kotlin
Oh My OpenAgent
OpenAI
OpenAI Codex
OpenClaw
R
SQL
Scala
TypeScript
Verdent
Visual Basic

API Availability

API Availability

Has API

Pricing Information

$29/month
Free Trial Offered?

Pricing Information

Pricing not provided

Supported Platforms

SaaS

Supported Platforms

SaaS

Customer Service / Support

Not specified

Customer Service / Support

Web-Based Support

Training Options

Documentation Hub

Training Options

Documentation Hub

Company Facts

Organization Name

Keelen

Date Founded

2026

Company Location

United States

Company Website

keelen.ai/

Company Facts

Organization Name

OpenAI

Date Founded

2015

Company Location

United States

Company Website

openai.com

Categories and Features

AI Coding Agents

Not specified

Categories and Features

Agentic AI

Not specified

AI Coding Agents

Not specified

AI Coding Models

Not specified

AI Models

Not specified

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