fx

fx

Vercel
+
+

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About

Codex Security is an AI-powered application security agent developed by OpenAI to help teams detect and fix vulnerabilities in software systems. The tool analyzes code repositories to understand the structure, architecture, and potential risk areas within a project. Using this context, it identifies complex security issues that traditional scanning tools might overlook. Codex Security prioritizes vulnerabilities based on their real-world impact, helping security teams focus on the most critical threats. The system also validates findings through sandboxed testing environments to reduce false positives and improve accuracy. Once vulnerabilities are confirmed, it proposes patches and remediation steps that align with the system’s existing behavior. By combining AI reasoning with automated validation, Codex Security helps development teams ship more secure code faster.

About

fx is a tiny, open, native coding agent harness and CLI written in Zig, optimized for research, performance, and embeddability as part of larger systems. Its design focuses on minimalism across the system prompt, tools, feature set, memory use, and a 6 MB binary, with an interface intended to feel closer to a Unix shell than a heavy terminal IDE. fx cold starts in microseconds and performs no unnecessary work or I/O before accepting input, making it suitable for programmatic use, resource-constrained environments, and agent sandboxes. Developers can start it inside a project and ask it to read files, search code, run commands, make changes, execute tests, and stream tool calls as they happen. The core is model- and provider-agnostic, supporting local models, gateways, direct provider access, and cloud inference. It is context-efficient by design, using a minimal system prompt and toolset to reduce token overhead and improve time to first token.

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

Codex Security is designed for software developers, DevSecOps teams, security engineers, and organizations that need advanced tools to detect vulnerabilities and secure their software development pipelines

Audience

Developers and AI infrastructure builders in need of a solution to run or embed a lightweight, extensible, model-agnostic coding agent in terminals, applications, and automated systems

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

No information available.
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
openai.com

Company Information

Vercel
Founded: 2015
United States
fx.sh/

Alternatives

Claude Security

Claude Security

Anthropic

Alternatives

CodeMender

CodeMender

Google DeepMind
Codename MDASH

Codename MDASH

Microsoft

Categories

Categories

Integrations

GPT-5-Codex-Mini
GPT-5.1
GPT-5.1 Instant
GPT-5.1 Thinking
GPT-5.1-Codex
GPT-5.2 Instant
GPT-5.2 Pro
GPT-5.2 Thinking
GPT-5.2-Codex
GPT-5.3 Instant
GPT-5.3-Codex
GPT-5.4
GPT-5.4 mini
GPT-5.6 Luna
GPT-5.6 Sol
GPT-5.6 Terra
GPT-6
GPT‑5-Codex
GPT‑5.4 Thinking
OpenAI Daybreak

Integrations

GPT-5-Codex-Mini
GPT-5.1
GPT-5.1 Instant
GPT-5.1 Thinking
GPT-5.1-Codex
GPT-5.2 Instant
GPT-5.2 Pro
GPT-5.2 Thinking
GPT-5.2-Codex
GPT-5.3 Instant
GPT-5.3-Codex
GPT-5.4
GPT-5.4 mini
GPT-5.6 Luna
GPT-5.6 Sol
GPT-5.6 Terra
GPT-6
GPT‑5-Codex
GPT‑5.4 Thinking
OpenAI Daybreak
Claim Codex Security and update features and information
Claim Codex Security and update features and information
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Claim fx and update features and information