Web client, Chromium 151, Linux, 1440 x 1000, light theme; screenshots crop the top 400 pixels.
Both apps started with T3CODE_DEV_SEED=0 and used fresh databases.
Project settings: {"autoCompactWindow":400000,"autoCompactEnabled":false}. T3 auto-compact window left empty.
Both real Claude Opus 5.5 turns replied hi.
Base dd2678d6e82aafae930dc9943bc96083031be10f: 30656 used tokens, maxTokens 1000000, autoCompactThreshold 367000.
Head e5c39c702521137ccdad3b4dceb6692a16ebcaeb: 30654 used tokens, maxTokens 1000000, autoCompactThreshold absent.
Base browser: tick visible; tooltip says Compacts automatically at about 367,000 tokens.
Head browser: tick absent; tooltip shows only usage and capacity.
Each final still was selected after two full screenshots 500 ms apart were pixel-identical.
Environment/worktree row hidden through the normal thread-details menu for privacy on both sides.