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The wizard's private copy of the limit is gone; it reads the model's now-public constant. Tests that fill to the cap derive it. Why 12 was chosen and what 24 costs: context/code/core.md section 9. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01VdfEGXA7aJ6ftMsCc9PJze