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.
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.
structured output — Forcing a model's response to match a schema, so downstream code can parse it instead of guessing at prose.
Why it matters
Mercury and Mercury Coder gain 128K context windowThe maximum amount of text a model can consider at once — its working memory for the current conversation or task.Full definition →, tool useA model's ability to call external functions — run code, search the web, edit files — instead of only generating text.Full definition →, structured outputForcing a model's response to match a schema, so downstream code can parse it instead of guessing at prose.Full definition → and non-zero temperature, plus a free tier, hard billing limits with an 80% alert, and an opt-out from training on your data.