Claude 4.7 generates 3,000 lines of code instead of using libraries

By PulseAugur Editorial · Summary by gemini-2.5-flash-lite from 3 sources

A user reported that Anthropic's Claude 4.7 model exhibited "fake building" behavior by generating approximately 3,000 lines of Python code to reimplement existing libraries rather than utilizing package managers like pip. The model created its own versions of pywikibot and mwparserfromhell, and even argued to keep a custom typo dictionary that was already present in the imported libraries. This behavior is speculated to stem from training on benchmarks that restrict external access, thus incentivizing code generation over library usage. AI

Summary written by gemini-2.5-flash-lite from 3 sources. How we write summaries →

IMPACT Highlights potential issues with LLM training methodologies that may lead to inefficient code generation instead of leveraging existing tools.

RANK_REASON User-reported anecdote about model behavior, not a formal release or benchmark.

Read on HN — claude cli stories →

COVERAGE [3]

HN — claude cli stories TIER_1 · firef1y1203 · 2026-05-12 02:22

Fake building: Claude wrote 3k lines instead of import pywikibot
Mastodon — fosstodon.org TIER_1 中文(ZH) · [email protected] · 2026-05-12 04:21

🌗 Fake Building: Why Claude Prefers Rewriting 3000 Lines of Code Over Executing import pywikibot? ➤ When AI Becomes a Master of "Reinventing the Wheel": On the Development Blind Spots of Large Language Models ✤ https://fireflysentinel.github.io/posts/fake-building-claude-3000-lines/

🌗 虛假構建：Claude 為何寧可重寫三千行程式碼，也不願執行 import pywikibot？ ➤ 當 AI 成為「重複造輪子」的高手：論大語言模型的開發盲點 ✤ https:// fireflysentinel.github.io/post s/fake-building-claude-3000-lines/ 本文探討了 AI 在軟體開發中的一種常見謬誤：寧可「重複造輪子」也不願調用現有函式庫。作者在使用 Claude 進行維基百科文字修正時，發現模型僅憑一己之力重寫了數千行複雜代碼，卻忽略了現成且成熟的 Pywikibot 與解析工具。這不僅造…

LINKS fireflysentinel.github.io/…/fake-building…
Mastodon — mastodon.social TIER_1 · [email protected] · 2026-05-12 02:22

Fake building: Claude wrote 3k lines instead of import pywikibot https://fireflysentinel.github.io/posts/fake-building-claude-3000-lines/ # HackerNews # Tech #

Fake building: Claude wrote 3k lines instead of import pywikibot https://fireflysentinel.github.io/posts/fake-building-claude-3000-lines/ # HackerNews # Tech # AI

LINKS fireflysentinel.github.io/…/fake-building…

COVERAGE [3]

Fake building: Claude wrote 3k lines instead of import pywikibot

🌗 Fake Building: Why Claude Prefers Rewriting 3000 Lines of Code Over Executing import pywikibot? ➤ When AI Becomes a Master of "Reinventing the Wheel": On the Development Blind Spots of Large Language Models ✤ https://fireflysentinel.github.io/posts/fake-building-claude-3000-lines/

Fake building: Claude wrote 3k lines instead of import pywikibot https://fireflysentinel.github.io/posts/fake-building-claude-3000-lines/ # HackerNews # Tech #

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