Long-Horizon Task
A goal that requires many dependent steps, decisions, tool calls, and course corrections before completion.
Plain English
It is work that cannot be solved in one neat prompt, such as migrating an app or researching a market.
Example
An agent spends hours modernizing a codebase, running tests, fixing regressions, and documenting the result.
Why it matters
Long-horizon ability is becoming a major benchmark for whether agents can handle valuable real-world work.