- In short
- Every Claude conversation has a finite working-memory budget -- the context window -- that fills as messages and uploaded documents accumulate. As the window nears its limit, the platform can automatically summarise earlier messages to make room, under specific plan and feature conditions. Summarisation compresses detail rather than deleting it outright, and full history typically remains available for reference, so a long session can behave differently late on than it did early purely because of this budget effect.
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