Claude Code Can No Longer Clone Games: What Anthropic Revised Is Its System Prompt
Anthropic updated Claude Code's system prompt: original games and games of a specific genre are permitted, while reconstructing any concrete existing off-the-shelf game is banned. As reported by Tom's Hardware, users have reported that Opus 5.5 is also blocking reverse engineering tasks. Since the restriction is set at the prompt layer, its actual enforcement boundary is yet to be confirmed.
Anthropic has updated the system prompt for Claude Code. The core rule is very straightforward: users are allowed to build original games, games of a certain genre, and games based on their own designs and assets; they are not allowed to recreate any specific existing game. As reported by The Verge, Tom's Hardware first covered this change.
Photo: Cath Virginia / The Verge
The background behind this adjustment is simple. The retro gaming community is currently flooded with AI-generated decompilation, recompilation and porting content, a phenomenon The Verge has previously reported on. Anthropic did not completely cut off Claude Code's game development capabilities. It retains the permission to "make games" while restricting "direct game cloning". This rule is written directly into the system prompt. For regular users, Claude Code can still be used to develop small original games. For developers, tasks including game replication, reverse engineering and porting may be blocked.
Last week, X user @chasmmmmmmmmmmm posted a screenshot that allegedly shows two new sentences added to Claude Code's system prompt: "Do build original games, games in a genre, and games from the user's own designs and assets. Don't build a recreation of a specific existing game, even if …" Only half of the sentence is visible in the screenshot. The headline of Tom's Hardware's report also mentions that users have reported Opus 5.5 is actively blocking reverse engineering tasks.
There is an easily overlooked detail here: the system prompt only sets behavioral constraints, not rigid legal boundaries. Whether the model will strictly enforce these rules, how it will judge edge tasks, and whether users can bypass the restrictions with alternative descriptions all remain to be seen. By adding the "do not clone specific existing games" rule to Claude Code's underlying instructions, Anthropic has essentially added a product-level restriction to such use cases. What is worth observing next is the actual enforcement effect, and whether normal game development tasks will be accidentally blocked.
Original story: The Verge Report
Tom's Hardware Report: Link
X Post: Link
发布时间: 2026-11-03 02:56