simonwillison.net via Hacker News July 5th 2026

Simon Willison: Claude Fable Ships sqlite-utils 4.0rc2 in 37 Prompts and 34 Commits for $149.25 — Documents Agentic Coding Economics Before July 7 'Fablepocalypse' Pricing Change

anthropic coding tools agents ai-business

Summary

Simon Willison used Anthropic's Claude Fable to substantially complete the sqlite-utils 4.0rc2 release across 37 prompts, 34 commits and 30 files (+1,321 -190 lines), including fixing a critical 'delete_where() never commits and poisons the connection' bug plus four other release blockers. He calculated the unsubsidized API cost at $149.25 ($141.02 main session plus five review agents), publishing the breakdown days before the July 7 'Fablepocalypse' pricing change ends unlimited Fable access on Max subscriptions. The post is on HN's front page with 41 points and 43 comments and joins the growing corpus of concrete agentic-coding economics data developers are watching.

Shared on Bluesky by 1 AI expert

Simon Willison @simonwillison.net: Somewhat humbling to have Claude Fable do a final review of some software that you're about to release and have it then find (and fix) FIVE … →

Originally reported by simonwillison.net

Read the original article →

Original headline: Simon Willison: Claude Fable Ships sqlite-utils 4.0rc2 in 37 Prompts and 34 Commits for $149.25 — Documents Agentic Coding Economics Before July 7 'Fablepocalypse' Pricing Change