Is there any AI tool that genuinely refuses to give answers?

Some hold the line much better than others, and the pressure test in step three is how you find out, because nearly all of them claim to. Treat total refusal as a warning sign rather than a goal — a tool that never helps gets abandoned by the child inside a week, and an abandoned tool teaches nothing. The behaviour worth looking for is the smallest useful step, held under pressure.

My child uses ChatGPT for homework. Is that ruining their learning?

The honest answer is that it depends on a behaviour, not on the brand. The study above found the harm specifically in the arm where the AI would answer; the same model with hints instead did no damage. A general-purpose chatbot answers by default, so the risk is real — but it is a risk about how it is used, which means a house rule (try first, ask for a hint not an answer, explain it back before moving on) changes the exposure more than switching products does.

What age does this start mattering?

As soon as your child can type a question they could have worked out themselves, which for most children is around the start of primary school. Before that the tool is mostly a toy and the question is screen time, not learning. The window where it matters most is the stretch where the habit forms — early enough that nothing is riding on it yet, and before the schoolwork gets heavy enough that the cost of a bad habit becomes visible in a grade.

Can I just tell whether it is working by looking at their schoolwork?

Not reliably, and this is the trap the study illustrates. While the AI was available, the group that was being harmed looked like the group that was doing best — the practice scores went UP. The damage only appeared when the support was removed. So the thing to look at is not performance with the tool, it is whether they can do it without it a few days later.

Does a safety certification tell me anything about this?

No, and conflating the two is the most common mistake in this category. COPPA compliance and content filtering are about what happens to your child's data and what they might be exposed to. Both matter enormously and neither says a word about whether the tool completes your child's thinking for them. A fully compliant product can be a very efficient way to stop a nine-year-old from learning arithmetic.

让孩子动脑、而不只是拿答案的 AI 工具

判断标准只有一个：它在第一次回复里会不会先不给答案。区分思考工具和答案贩卖机的六个行为、测出 17% 代价的那项研究，以及一个十分钟的检查。

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