OpenAI's Codex is a knowledge work platform built around 7 core capabilities: full file access, persistent memory, plugins, skills, GPT image access, browser and computer use, and automations. Riley Brown walks through each one in under 30 minutes, treating Codex not as a chatbot but as an operating layer for structured work.
The breakdown matters because each capability compounds the others. Persistent memory changes how Codex handles context across sessions. Skills let users define repeatable workflows. The automations section and the bonus Chronicle feature are where the platform starts to look less like a tool and more like a system, and that distinction is worth understanding before you build on top of it.
Watch this if you are evaluating Codex for real work use, not just experimentation. The timestamp structure means you can jump directly to the capabilities most relevant to your stack. The Chronicle feature at 25:31 is the part most coverage skips entirely.
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