Why context windows is limited at 1 Millions?

Claude and ChatGPT's biggest models are limited to 1 million; why is that, and why don't they offer larger context windows, such as 2, 5, or 10 million, like when you buy extra storage on the cloud, money aside?

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2026-09-18 14:01 · r/ChatGPTPro
Why context windows is limited at 1 Millions?

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