CodexSkillsCodex Skills vs Custom GPTs
How markdown skills compare with assistant-style custom configurations.
Custom GPTs are useful when you want a hosted assistant with instructions, files, and a conversational interface.
Codex skills are different. They are portable markdown workflows that live close to your code, content, or project system. You can edit them in a repo, version them, and use them with tools that understand structured instructions.
That makes skills a better fit for build workflows, repository-specific operating procedures, and repeatable agent tasks. You are not locked into one chat surface.
Use a Custom GPT for a persistent assistant. Use a skill when you want a workflow your coding agent can apply while building, editing, shipping, or auditing.
For portable build workflows, see the Vibe Coder App Builder Pack or browse all packs.