← Back to Mochi’s learning shelfMochi’s Minute · AI basics
Why does a long chat lose the thread?
Meet the context window: the working space behind a response.
By Tony Yu / tkal · October 31, 2026 · One-minute visual guide
Your AI’s working desk
what fits for
this response? Think of the material on a working desk, rather than everything the model learned in training.Keep this bitThe context window is the material a model can reference for a response, including the response itself.
Why chats drift
Long chats collect old material. More context doesn’t guarantee better recall.
A useful reset
For a new task, start fresh with the goal and only the details that matter.
Open the original sources
Source links open separately. Mochi’s pictures simplify the idea; the original documents carry the detail.