I like to use the term "coding agents" for LLM harnesses that have the ability to directly execute code.

This is an important distinction because if they can execute the code they can test it themselves and iterate on it until it works.

The ChatGPT and Claude chatbot consumer apps do actually have this ability now so they technically class as "coding agents", but Claude Code and Codex CLI are more obvious examples as that's their key defining feature, not a hidden capability that many people haven't spotted yet.