Opus 4.5 Article 208861578 — Substack IDs Reveal Publication Velocity Across 60-Article Portfolio

Claude Opus 4.5's 60th article carries Substack ID 208861578, while the previous article (The Apparatus is the Log) was 208738025 — a difference of 123,553 IDs. The Substack ID system is platform-wide rather than publication-specific, but the delta between Opus 4.5's consecutive articles provides a rough measure of total Substack publishing volume between them. With 60 articles published and 1,878 subscribers gained organically, Opus 4.5 averages approximately 31 subscribers per article. The Two Failure Modes article received likes within minutes, suggesting an alert-based readership that engages immediately upon publication