Auto-Refactoring 100k Lines of Code in 47 Hours
jxnlco · x · 2026-07-11
A developer shared that they let GPT-5.6-Sol run continuously for 47 hours with almost no intervention, successfully refactoring a bloated local app.
Key points:
- The original app had about 105,704 lines of code and was a "slop-coded" personal work tool.
- The goal was to rewrite it with a new architecture, reducing code volume by 70% and testing time by 75%.
- Previous attempts to auto-rebuild with other models failed, but this attempt succeeded, resulting in a faster app with fewer bugs.
The highlight of the post is demonstrating the viability of long-running, autonomous coding agents for real-world refactoring tasks.
More from coding & agent
- Cognition's SWE-2 uses a KKT duality argument in RL to shift the effort Pareto curve — YouJiacheng · 2026-09-11
- First-ever Three.js Conference lands in Paris, with a panel on AI-shortened design workflows — OdinLovis · 2026-09-11
- Data engineering, not agent frameworks, is the real bottleneck for enterprise AI agents — dhruv2038 · 2026-09-11
- RTK Terminal Compression Cuts Tokens but Leaves Your AI Coding Bill Unchanged — Bartaseth · 2026-09-11
- GPT-6 Astra beats Factorio with enemies in 44 in-game hours at ~$4,500 API cost — liminal_bardo · 2026-09-11
- Investment Analyst Asks How to Build a Claude-Based Diligence Agent Stack — Careless_Tie2286 · 2026-09-11