Long-horizon model – Definition & Meaning

Definition of long-horizon model

: an AI model designed to work autonomously on a goal through many steps and repeated attempts over hours, days, or longer, rather than answering in a single short interaction
- The long-horizon model kept testing new approaches after its first experiment failed.
- A safety check that works for a ten-second answer may miss problems that emerge during a long-horizon task.

Origin & history

first known use2026

Researchers have long described tasks and planning problems as long-horizon. The phrase became a distinct label for persistent AI systems in 2026, when frontier labs began discussing models that could carry out open-ended work autonomously for extended periods.

Test yourself

Which of these is the meaning of long-horizon model?

Related terms

AI agent an AI system that can pursue a goal over many steps on its own, deciding what to do next… agent loop the repeating cycle at the heart of an agent: the model decides on an action, a tool carries… background agent an AI agent that works on a task by itself in the cloud while you do something else, then… reasoning model a language model trained to work through a problem step by step before giving its final… trajectory-level monitoring the practice of evaluating an AI agent's full sequence of observations, reasoning, tool calls… context window the maximum amount of text, measured in tokens, that a model can consider at one time…

Cite this entry

"Long-horizon model." AI Dictionary, Dadgogo, https://dadgogo.com/dictionary/long-horizon-model/. Accessed 4 Oct. 2026.