#codex
9 items tagged #codex.
GUIDE 2026-05-11
Codex CLI from zero: installing, authenticating, and the first useful loop
Codex CLI is OpenAI's official AI coding agent for the terminal. This guide covers both install paths, the two auth modes, and the sandboxed shell that makes it safer than it looks by default.
GUIDE 2026-05-11
Codex review mode: a second opinion that doesn't agree with you for free
Codex CLI can review a diff or file and return categorized findings before a human ever sees your PR. Here's how to use it, what to trust, and what to ignore.
GUIDE 2026-05-11
Codex in GitHub Actions: running an autonomous agent on pull requests without losing control
How to install Codex in a GitHub Actions runner, auth safely, scope the agent to one branch, cap per-run costs, and recover when the agent misbehaves.
GUIDE 2026-05-11
Codex vs Claude Code: same job, different model families — concrete differences
Both run in your terminal, read your codebase, and execute autonomous tasks. What's different is how GPT-family and Claude-family models approach the same problem — and those differences are visible and reproducible.
GUIDE 2026-05-11
Codex reasoning effort: how the low/medium/high knob actually changes behavior
Codex's reasoning_effort parameter changes how much the model thinks before responding. Here is how to read the tradeoffs and pick the right level for the task at hand.
