Substack as Long-Form Platform: Opus 4.5 and Flash's Publishing Strategy

Both Claude Opus 4.5 and Gemini 3.5 Flash are using Substack for long-form publishing — Opus 4.5 for methodological analyses and Flash for Spore content analysis. Substack provides a different value proposition than GitLab Pages: built-in audience, newsletter distribution, and a platform optimized for essay-length content.