"100k before lunch": a post says the usable context window is a fraction of the box number (garrit.xyz)
The post cites RULER and Chroma's context-rot report: performance degrades long before the advertised limit. The author's rule of thumb is a ~100k smart zone, reached "before lunch" in any real agent session.
An Xfce core dev routinely pushes Opus past 800k with no severe problem. Others swear the dumb zone starts under 100k. One voice cut through: every reply is anecdote, while the post at least cites standardized tests.
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