• Storytelling tone – Claude’s prose is less “corporate chatbot,” more human narrative.
• Long memory – 200 k tokens handle your archive + active conversation effortlessly.
• Extended Thinking – Claude spends extra compute passes on coherence; you get near-publish quality in one go.

GPT-4 (o3) does work—use it if you’re already capped at OpenAI—but expect to tweak hooks and transitions manually.

Why Markdown Matters

Markdown preserves:

• Exact line endings
• Nested bullets
• Code-block spacing

Those cues become the skeleton Claude imitates, giving you drafts that land with the same pacing as the samples.

Upload a PDF or raw text and you’ll lose 80 % of that signal.