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AI/TLDR

Context Windows & Model Memory

What a model can hold in its head at once — and what happens when it can't.

START HEREWhat Is a Context Window? LLM Memory Limits ExplainedUnderstand the hard limit on what a model can see at once — and why your system prompt, history, and output all compete for it.BEGINNER

BEGINNERWhat Happens When You Exceed the Context Window?INTERMEDIATEWhat Is the 'Lost in the Middle' Problem in Long-Context Models?ADVANCEDHow Do Million-Token Context Windows Actually Work?