Learn Codex CLI (2026)
Hand-reviewed courses, official docs, and tutorials for getting fluent in Codex CLI. Editorial picks ordered by what we'd recommend to a friend.
OpenAI Codex CLI is the OSS terminal agent OpenAI ships — the "official" alternative to Claude Code if your stack is OpenAI-anchored. The community around Codex CLI is smaller than Claude Code's in 2026, but the OSS license and direct OpenAI integration make it the right pick for teams already on the OpenAI API.
The right learning path: start with the OpenAI Codex CLI docs and the Cookbook examples, then build 2-3 custom workflows using the agent mode. The OpenAI Cookbook in general is one of the highest-leverage free resources for AI engineers — most of its patterns transfer beyond Codex CLI.
Official docs & tutorials
Vendor-published and community-vetted resources — start with the one marked “primary”.
Related learning
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