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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‑Spark?

GPT-5.3-Codex-Spark is a specialized, ultra-fast coding model designed to enable real-time collaboration within the Codex platform. As a streamlined variant of GPT-5.3-Codex, it prioritizes latency-sensitive workflows where immediate responsiveness is critical. When deployed on Cerebras’ Wafer Scale Engine 3 hardware, Codex-Spark delivers more than 1000 tokens per second, dramatically accelerating interactive development sessions. The model supports a 128k context window, allowing developers to maintain broad project awareness while iterating quickly. It is optimized for making minimal, precise edits and refining logic or interfaces without automatically executing additional steps unless instructed. OpenAI implemented extensive infrastructure upgrades—including persistent WebSocket connections and inference stack rewrites—to reduce time-to-first-token by 50% and cut client-server overhead by up to 80%. On software engineering benchmarks such as SWE-Bench Pro and Terminal-Bench 2.0, Codex-Spark demonstrates strong capability while completing tasks in a fraction of the time required by larger models. During the research preview, usage is governed by separate rate limits and may be queued during peak demand. Codex-Spark is available to ChatGPT Pro users through the Codex app, CLI, and VS Code extension, with API access for select design partners. The model incorporates the same safety and preparedness evaluations as OpenAI’s mainline systems. This release signals a shift toward dual-mode coding systems that combine rapid interactive loops with delegated long-running tasks. By tightening the iteration cycle between idea and execution, GPT-5.3-Codex-Spark expands what developers can build in real time.

Media

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Media

Integrations Supported

Codex CLI
Codex Security
Microsoft Foundry
OpenAI
OpenAI Codex
OpenClaw

Integrations Supported

Codex CLI
Codex Security
Microsoft Foundry
OpenAI
OpenAI Codex
OpenClaw

API Availability

Has API

API Availability

Has API

Pricing Information

$29/month
Free Version
Free Trial Offered?

Pricing Information

Pricing not provided
Free Version
Free Trial Offered?

Supported Platforms

SaaS
Android
iPhone
iPad
Windows
Mac
On-Prem
Chromebook
Linux

Supported Platforms

SaaS
Android
iPhone
iPad
Windows
Mac
On-Prem
Chromebook
Linux

Customer Service / Support

Standard Support
24 Hour Support
Web-Based Support

Customer Service / Support

Standard Support
24 Hour Support
Web-Based Support

Training Options

Documentation Hub
Webinars
Online Training
On-Site Training

Training Options

Documentation Hub
Webinars
Online Training
On-Site Training

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

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