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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

Reasonix is an open source coding agent designed for long autonomous sessions that remain readable, auditable, and reversible. One local engine powers four interfaces: terminal, desktop app, browser, and ACP-compatible editors, with sessions, permissions, skills, and MCP servers shared across them. Plan mode holds every write until the proposed steps are reviewed and approved, while reads, writes, and shell commands are separately gated and constrained by a workspace sandbox. Each turn creates a checkpoint outside Git, allowing users to rewind a long run without affecting commit history. MCP support over stdio, SSE, and streamable HTTP merges external tools into one registry, while Markdown skills and isolated subagents extend the agent without requiring a fork. Reasonix maps a codebase once and keeps that map throughout the session, letting users queue tasks, review diffs, and resume work without losing context.

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

Software developers and engineering teams wanting a tool to run long, auditable AI coding sessions, automate repository work, and extend agent capabilities across terminal, desktop, browser, and editor workflows

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

Pricing

$1.25 per input
Free Version
Free Trial

Pricing

Free
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

Reasonix
China
reasonix.io

Alternatives

Claude Opus 4.5

Claude Opus 4.5

Anthropic

Alternatives

Claude Code

Claude Code

Anthropic
OpenClaw

OpenClaw

Molty

Categories

Categories

Integrations

C
ChatGPT
ChatGPT Plus
ChatGPT Pro
Codex CLI
Cursor
DeepSeek-V4-Pro
F#
GPT-5.6 Terra
GitHub
Go
HTML
JetBrains Junie
Laravel
OpenAI Codex
Ruby
Shiori
Verdent
Visual Basic
Zo Computer

Integrations

C
ChatGPT
ChatGPT Plus
ChatGPT Pro
Codex CLI
Cursor
DeepSeek-V4-Pro
F#
GPT-5.6 Terra
GitHub
Go
HTML
JetBrains Junie
Laravel
OpenAI Codex
Ruby
Shiori
Verdent
Visual Basic
Zo Computer
Claim GPT-5.1-Codex and update features and information
Claim GPT-5.1-Codex and update features and information
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Claim Reasonix and update features and information