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About

GPT-5.1-Codex is a specialized version of the GPT-5.1 model built for software engineering and agentic coding workflows. It is optimized for both interactive development sessions and long-horizon, autonomous execution of complex engineering tasks, such as building projects from scratch, developing features, debugging, performing large-scale refactoring, and code review. It supports tool-use, integrates naturally with developer environments, and adapts reasoning effort dynamically, moving quickly on simple tasks while spending more time on deep ones. The model is described as producing cleaner and higher-quality code outputs compared to general models, with closer adherence to developer instructions and fewer hallucinations. GPT-5.1-Codex is available via the Responses API route (rather than a standard chat API) and comes in variants including “mini” for cost-sensitive usage and “max” for the highest capability.

About

Keelen is an autonomous coding loop. It turns free-form requests into a prioritized roadmap, breaks roadmap items into dev-ready tasks with acceptance criteria, implements each task in an isolated single-use VM using your own Claude, Codex, GLM, or Kimi credentials, and ships the result as a merged pull request, or holds it for review if that is how you configure it. Every change passes five verification gates before merge: a red-first test proof, an independent adversarial review of the diff by a model that shares no context with the run that wrote it, the project's own test suite on a clean checkout, a CI-green requirement, and a review window before gated auto-merge. The loop may never weaken a check to reach green. Each iteration runs in a single-use, non-root VM that is destroyed when the run ends, with deny-by-default network egress. Per-run GitHub tokens are scoped to one repository. Keelen is not an IDE copilot and not a chat agent.

Platforms Supported

Windows
Mac
Linux
Cloud
On-Premises
iPhone
iPad
Android
Chromebook

Platforms Supported

Windows
Mac
Linux
Cloud
On-Premises
iPhone
iPad
Android
Chromebook

Audience

Software engineers and engineering organizations wanting a tool to generate, refactor and maintain code at scale, integrated into their existing development toolchain

Audience

Solo developers, indie hackers, and small product teams who already pay for a Claude, Codex, GLM, or Kimi plan. Also agencies running several client repositories.

Support

Phone Support
24/7 Live Support
Online

Support

Phone Support
24/7 Live Support
Online

API

Offers API

API

Offers API

Screenshots and Videos

Screenshots and Videos

No images available

Pricing

$1.25 per input
Free Version
Free Trial

Pricing

$29/month
Free Version
Free Trial

Reviews/Ratings

Overall 0.0 / 5
ease 0.0 / 5
features 0.0 / 5
design 0.0 / 5
support 0.0 / 5

This software hasn't been reviewed yet. Be the first to provide a review:

Review this Software

Reviews/Ratings

Overall 0.0 / 5
ease 0.0 / 5
features 0.0 / 5
design 0.0 / 5
support 0.0 / 5

This software hasn't been reviewed yet. Be the first to provide a review:

Review this Software

Training

Documentation
Webinars
Live Online
In Person

Training

Documentation
Webinars
Live Online
In Person

Company Information

OpenAI
Founded: 2015
United States
platform.openai.com/docs/models/gpt-5.1-codex

Company Information

Keelen
Founded: 2026
United States
keelen.ai/

Alternatives

Claude Opus 4.5

Claude Opus 4.5

Anthropic

Alternatives

Cosmos

Cosmos

Augment Code

Categories

Categories

Integrations

C
C#
ChatGPT
ChatGPT Plus
Codex Security
Elixir
F#
GPT-5.6 Luna
GitHub
GitHub Copilot
Java
Julia
Kotlin
PHP
Python
SQL
Scala
Shiori
Verdent
Visual Studio Code

Integrations

C
C#
ChatGPT
ChatGPT Plus
Codex Security
Elixir
F#
GPT-5.6 Luna
GitHub
GitHub Copilot
Java
Julia
Kotlin
PHP
Python
SQL
Scala
Shiori
Verdent
Visual Studio Code
Claim GPT-5.1-Codex and update features and information
Claim GPT-5.1-Codex and update features and information
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