Anthropic orders AI tool Claude to stop remaking video games

Anthropic has issued an update to its Opus 5.5 model, modifying Claude Code’s internal rules to prohibit the recreation of specific existing games, even if renamed or rebranded. The change was implemented on October 27 under the internal identifier 'tengu_heron_brook,' with no option for users to disable the restriction. Anthropic’s technical staff member Addy Osmani stated the update aligns with the company’s usage policy against IP infringement, while still permitting original games, genre-based projects, or creations from user-owned designs and assets.

The move follows growing industry unease over AI-generated game clones, which some developers fear could undermine their work by accelerating unauthorized copies to market. Digital Sun Games recently canceled a public playtest for its upcoming title ReVamp due to concerns that demo content could be ingested into AI tools to produce competing versions. Valve has also faced pressure from developers, including requests for clarity on how Steam will address shady clones, prompting a rare explanation to developers in South Korea.

While Anthropic’s restriction may deter low-effort copycats, experts warn that generative AI safeguards can often be bypassed through rhetorical techniques or prompt engineering. The update does not address how the system would verify ownership of game ideas or assets, leaving ambiguity in enforcement. Critics note that users seeking to bypass restrictions could simply switch to open-weight models, which lack similar limitations.

Anthropic confirmed the update after initial reporting by X user Chasm, who highlighted the new rule’s presence in Claude Code’s prompt. The company has not provided further details on enforcement mechanisms or potential penalties for violations. GameDeveloper.com has reached out for additional comment and will update the story if further responses are received.