Treat the context window as RAM, not storage — assume reliability drops above 50% fill

Beam AI·high signal

A recurring root cause of agent failures in 2026 is engineers treating the context window as durable storage instead of fast, volatile, expensive working memory. The safe engineering assumption: reliable performance degrades meaningfully once complex-reasoning tasks pass ~50% of the advertised max context, well before the hard limit. Budget your prompts to that 50% line and offload everything else to a persistent layer beneath the window.