For the complete documentation index, see llms.txt. Markdown versions of documentation pages are available by appending .md to the page URL.
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OpenAI Developer Blog

Codex blog posts

Scaling cyber defenders with Daybreak
Aug 21
Scaling cyber defenders with Daybreak

Use ChatGPT, Codex Security, and open-source tools to investigate threats, validate vulnerabilities, and move from findings to reviewed, verified fixes.

Codex
Codex as a platform: build on the open agent harness
Aug 19
Codex as a platform: build on the open agent harness

Build Codex into the products and workflows your users already know.

Codex
Custom Code Review rules for Codex
Jul 20
Custom Code Review rules for Codex

Provide more detailed rules for Codex to spot issues and better adhere your conventions during code review.

Codex
Mastering remote engineering work from your phone
Jun 23
Mastering remote engineering work from your phone

Use Remote in the ChatGPT mobile app to start, steer, review, and organize engineering work.

Codex
Using skills to accelerate OSS maintenance
Mar 9
Using skills to accelerate OSS maintenance

Using skills and GitHub Actions to optimize Codex workflows in the OpenAI Agents SDK repos.

Codex
Building frontend UIs with Codex and Figma
Feb 26
Building frontend UIs with Codex and Figma

Use Codex and Figma to bring real, running interfaces into Figma, refine them, and bring changes back to Codex.

Codex
Run long horizon tasks with Codex
Feb 23
Run long horizon tasks with Codex

Codex
Testing Agent Skills Systematically with Evals
Jan 22
Testing Agent Skills Systematically with Evals

A practical guide to turning agent skills into something you can test, score, and improve over time.

Codex
Supercharging Codex with JetBrains MCP at Skyscanner
Jan 11
Supercharging Codex with JetBrains MCP at Skyscanner

How Skyscanner integrated Codex CLI with JetBrains IDEs to speed up debugging, testing, and development workflows.

Codex
Using Codex for education at Dagster Labs
Oct 27
Using Codex for education at Dagster Labs

Learn how Dagster uses Codex in their open-source projects to accelerate documentation, translate content across mediums, and even measure how complete their docs are.

Codex
How Codex ran OpenAI DevDay 2025
Oct 10
How Codex ran OpenAI DevDay 2025

Learn how Codex helped us build experiences, demos, products, and more

Codex