A large language model gives an agent its ability to understand instructions, interpret text, generate responses, and reason across context. The agent layer gives the model tools, memory, workflow logic, permissions, and action-taking ability.
For Growth Marshal's audience, the distinction matters. ChatGPT alone is not an agent system. An LLM agent is a model wired into a workflow with access to the right business context and tools. That is what allows it to update a CRM, draft a follow-up, check a knowledge base, summarize a call, or prepare a weekly report.