NO on Any AI model scores ≥1550 on LMSYS leaderboard before Jul 1

March top ~1504, Jun 5 top 1504 — opus 4.7, opus 4.8, gpt-5.5 and muse-spark all failed to move the ceiling. Arena ELO compresses at the top. Cleanest tail risk: Fable 5 debuts with a provisional spike ≥1550 (rules count any appearance before Jul 1).