Memory window — definition and meaning
A memory window is how far back an AI companion can still recall your earlier conversations — days, weeks, or indefinitely. It is set by the platform's memory layer, not by the model's context window.
Last reviewed 2026-08-14
A memory window is how far back the platform lets your history reach — a product decision more than a model limit. People use the phrase loosely, often meaning the context window, which is a different thing: what the model sees inside one conversation. Rolling windows drop anything past a set span; unlimited ones don't, though no window makes recall lossless — older chats get compressed or reduced to extracted facts first, which is why "you had a hard March" survives while the dog's name goes. Bae's free tier is a rolling seven days plus anything you pin; Pro's doesn't expire.
About memory window.
What is memory window?
A memory window is how far back an AI companion can still recall your earlier conversations — days, weeks, or indefinitely. It is set by the platform's memory layer, not by the model's context window.
How is "memory window" used in AI companion apps?
A memory window is how far back the platform lets your history reach — a product decision more than a model limit. People use the phrase loosely, often meaning the context window, which is a different thing: what the model sees inside one conversation. Rolling windows drop anything past a set span; unlimited ones don't, though no window makes recall lossless — older chats get compressed or reduced to extracted facts first, which is why "you had a hard March" survives while the dog's name goes. Bae's free tier is a rolling seven days plus anything you pin; Pro's doesn't expire.
What other terms relate to memory window?
Related terms in the AI companion space include: Context window, Long-term memory (in AI companions), Memory canon, Hallucination (AI). Each has its own glossary entry on /glossary.
Where we've seen this in practice.
- Context window
A context window is the maximum amount of text — measured in tokens — an AI model can consider at once. Anything beyond it is forgotten unless stored and re-supplied by a separate memory system.
- Long-term memory (in AI companions)
An AI companion's ability to recall facts and context from prior conversations across days, weeks, and months.
- Memory canon
A user-readable, user-editable record of what an AI companion remembers about the user and the relationship.
- Hallucination (AI)
An AI hallucination is when a model generates information that sounds confident and plausible but is factually wrong or invented. A core limitation of large language models.