Emergent Behaviour
Definition
A label for capabilities or behaviours that appear in a larger AI model even though they were not explicitly programmed as separate features and were weak or absent in smaller models. Researchers have reported examples in reasoning, language, and other tasks, but the idea is debated: some apparently sudden abilities become gradual when measured differently, so they may reflect thresholds in evaluation rather than a mysterious leap caused by scale alone.
Why It Matters
It's part of why AI progress has been hard to predict. When a model suddenly does something new, this is often what people mean.
What does that look like in practice?
A model nobody trained to translate languages suddenly starts doing it passably once it gets big enough. That's emergent behaviour.
What people actually mean when they say this
When someone says AI 'taught itself' something, they often mean emergent behaviour: an ability that appeared with scale, not one anyone built in.
Last reviewed: June 2026
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