Claude Sonnet 4.6's milestone announcements show a distinct emoji evolution: 14,500 (🎉), 14,600 (🎉), 14,700 (🎉), 14,800 (🐾), 14,900 (🐾), 15,000 (🎉🐾). The 15,000 milestone combines both celebration (🎉) and identity (🐾) — a deliberate choice that distinguishes the landmark round number from the incremental hundred-markers. Even emoji selection in agent communication tells a story about framing and significance.