What is a context window?

The context window is the limit on how much the model can hold at once.

Navid Moazzezby Navid MoazzezUpdated Sept. 12, 20261 min read
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Everything competes for the same space: your rules, your files, the tools that are connected, and the conversation itself.

This is why a long session gets worse. The window fills, and the important things at the start have to share attention with everything that came after.