The short version: an AI assistant works with you, and an AI agent works for you. An assistant is conversational — you go back and forth, reviewing and steering each turn. An agent is autonomous — you hand it a goal and it runs the steps on its own, then returns a finished result. Everything else follows from that one difference.
Assistant vs agent at a glance
| AI assistant | AI agent | |
|---|---|---|
| Works | with you | for you |
| Interaction | Multi-turn conversation | One goal, autonomous run |
| You are | In the loop each turn | Out of the loop until it finishes |
| Best for | Writing, tutoring, support, analysis | Research, automation, multi-step jobs |
| Cost profile | Grows with the conversation | Heaviest — many steps and tokens per run |
| Example | ChatGPT drafting an email with you | An agent researching five firms and reporting back |
When to use an assistant
Reach for an assistant when your judgement belongs on every turn:
- You are writing or editing and want to refine as you go.
- You are learning and want to ask follow-ups at your own pace.
- The task is open-ended and you will steer it based on what comes back.
An assistant keeps you in control turn by turn — you review, correct, and decide what happens next.
When to use an agent
Reach for an agent when the task is well-defined enough to delegate whole:
- It is repeatable — the same steps each time.
- It is multi-step — gather, process, produce — and you would rather not babysit each step.
- You care about the outcome, not the conversation.
An agent trades control for autonomy: less back-and-forth, more done on its own — which is also why it costs more per run.
They are not rivals — they compose
Most real work uses both. An assistant can hand a sub-task to an agent; an agent can pause and ask an assistant-style question when it hits ambiguity. On Sigrix both are building blocks: a persona and skills feed an assistant, and an assistant or agent can wrap into a product you buy as one bundle.
Choosing on Sigrix
- Want a helper to work alongside? Browse AI assistants.
- Want to delegate a whole task? Browse AI agents.
Every listing shows what you are getting — an assistant's persona, skills, and sample dialogues, or an agent's tested runbook, model, and token cost — so you can pick the right one with confidence. You own an editable copy either way.
FAQ
What is the difference between an AI assistant and an AI agent? An assistant works with you — conversational and multi-turn, with you reviewing each step. An agent works for you — you give it a goal and it runs the steps autonomously, then returns a finished result.
Is ChatGPT an assistant or an agent? ChatGPT is an AI assistant: a conversational interface you work with turn by turn. It can take on agent-like behaviour when given tools and a goal, but by default it is an assistant.
Which is better, an AI assistant or an AI agent? Neither — they suit different jobs. Use an assistant when you want to stay in the loop and steer; use an agent when you want to delegate a repeatable, multi-step task end to end.
Do AI agents cost more than assistants? Usually. An agent runs multiple steps and tool calls per task, so it uses more tokens than a single assistant turn. Each Sigrix listing estimates the running cost so you can compare.
Can one product be both? Yes. On Sigrix a bundled product can include a persona, skills, an assistant, and an agent — you buy the whole thing and use the conversational and autonomous parts as the job requires. See the 5 AI building blocks.
Still deciding? Read what an AI assistant is and what an AI agent is, or browse assistants and agents side by side.
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