AI Glossary
Long-horizon task
What does “Long-horizon task” mean?
Long-horizon task: Job that takes many steps, often over hours, where early decisions affect later ones. Such tasks test an agent's ability to stay on track, recover from errors and manage its context, not just answer single questions well.

What is an example of “Long-horizon task”?
Building and testing a small app from a written spec is a long-horizon task; answering one coding question is not.