The Dumb Zone

dexter-horthy's name for the context-window region where model output quality visibly degrades — "around 40% on average depending on what you're doing."

"Around 40%… shoot to keep it under 40 and if you get up to 60, like think about wrapping it up and like you can keep iterating on the same doc."

Practical rule

• < 40% context used → full quality.
• 40–60% → watch for degradation, start preparing to rotate.
• > 60% → wrap up the current thread, resume from a static asset.

Why this matters

The dumb zone explains the "why" behind static-asset-workflow: you need everything important written to disk before you cross 60%, or you lose quality on the final synthesis. It's a quantitative hook for a phenomenon most operators feel vaguely ("Claude is getting worse at the end of long sessions") and gives a rule of thumb: don't let it happen, instead rotate sessions with durable state.