Foundation Model
One of the large, general-purpose models that everything else in AI is built on top of - trained once, at enormous cost, by a handful of organisations, then adapted by everyone else. When a vendor says they "use AI", this is almost always the layer they are renting rather than building.
Also calledfoundation modelsfoundation model apifoundation model apis
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Plain-English definitions of the AI and AI agent terms that turn up in vendor pitches, product decisions and team conversations.