• eval — A repeatable test for AI quality — a set of tasks plus scoring — used the way software teams use test suites, because model output is too variable to judge by eyeballing.
• tool use — A model's ability to call external functions — run code, search the web, edit files — instead of only generating text.
• context window — The maximum amount of text a model can consider at once — its working memory for the current conversation or task.
• AI agent — An AI system that doesn't just answer once but works toward a goal in a loop — taking actions, reading the results, and deciding what to do next.

It puts a number on how much of an agent's work actually needs a frontier model, and the integration is available now rather than described in the abstract.

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