Claude API – Be on the Right Side of Change

Best AI for Writing a Book Series: Book 5 Needs 213,000 Tokens of Memory

October 23, 2026 by Michael

Featured chart: tokens of earlier books an AI must hold before writing Books 2 to 10 of a 40,000-word-per-book series, rising from 53,333 to 480,000; Book 5 is highlighted at 213,333 tokens, above a 200k-token context window, while a story bible stays at 4,000 to 36,000 tokens

The best AI for writing a book series needs memory: by Book 5, Books 1-4 are 213,000 tokens. Why a story bible beats a bigger window, with Python math.

What a 50,000-Word AI Novel Draft Costs on the OpenAI and Claude APIs: $0.04 to $17

October 20, 2026October 12, 2026 by Michael

Dumbbell chart of the API cost of one 50,000-word novel draft on seven models, log scale: from 4 cents (gpt-6-luna, outline only) to $16.71 (claude-fable-5-1, resending every chapter).

A small Python cost model prices a 50,000-word first draft on seven OpenAI and Claude models: from $0.04 to $16.71. About 73% of a naive bill is resending earlier chapters, and prompt caching removes most of it.