{"rewrite":{"id":"r_7ea7abecb16265d6c8e67896","clusterId":"c_9612cb9aef201137547e6065","slug":"anthropic-adds-rule-barring-claude-from-recreating-existing-games","model":"deepseek-v4-1-flash","headline":"Anthropic Adds Rule Barring Claude From Recreating Existing Games","summary":"Addy Osmani, involved in development of Anthropic's AI coding tool Claude, said on X on October 31 that he added two sentences to the Claude prompt on model 5.5 directing it not to recreate other people's specific games. Original games, genre games, and games built with a user's own designs and assets are expected to keep working. Users had reported the rule arriving around October 27.","whyItMatters":"The rule answers a complaint that AI tools could produce close copies of existing games on request, but it leaves the enforcement to a prompt instruction delivered from Anthropic's servers with no user-side switch.","webCardHtml":"\u003cp\u003eThe restriction was first spotted by X user chasm, who posted on October 30 that a rule had appeared around October 27, distributed from Anthropic\u0026#39;s servers under a flag named tengu_heron_brook with no user-side setting to turn it off. The rule tells users they may build original games, games in specific genres, and games using their own designs and assets, but should not recreate certain existing games even under a changed name or a claim of originality.\u003c/p\u003e\u003cp\u003eOsmani, replying to that post, said he added the two sentences and that further adjustments will follow to find an appropriate balance. He asked users to report cases where Claude refuses to build something they hold rights to before the tuning is finished. Recreations of Terraria and Rocket League using model 5.5 had been circulating on X in late September, and chasm asked whether the rule would also reach remakes and mods.\u003c/p\u003e","blueskyPost":"Addy Osmani says users reported the Claude rule landing around October 27, days before he described adding it. A prompt tweak that reaches users ahead of its own explanation leaves the enforcement date as the open question.","twitterPost":"Addy Osmani's two-sentence Claude prompt edit arrived around October 27 for users, by his account. Enforcement timing is now the loose end.","threadsPost":"Addy Osmani frames the Claude change as two sentences added to the model 5.5 prompt, with original games, genre games, and user-asset builds expected to keep working. Users reported the rule arriving around October 27, which puts the stated edit after the behavior it explains.","newsletterBlurb":"Anthropic has added instructions to Claude directing it not to recreate specific existing games, according to Addy Osmani, who works on the tool. He said original games and builds using a user's own assets should keep working. The rule is served from Anthropic's servers with no user-side switch, and users have raised questions about remakes and mods.","attributionJson":"[{\"source\":\"Game Spark\",\"url\":\"http://www.gamespark.jp/article/2026/10/31/174341.html\",\"title\":\"Engineer confirms restrictions on \\\"recreating existing games\\\" with Claude Code-original works expected to continue working. Will this curb \\\"AI clone games\\\"?\"}]","lintFlagsJson":null,"lintHits":0,"costUsd":0,"inputTokens":5219,"outputTokens":812,"status":"published","repairAttempts":0,"nextRepairAt":null,"factsAttemptedAt":1793439116,"createdAt":"2026-10-31T09:26:14.000Z","publishedAt":"2026-10-31T09:30:56.000Z","updatedAt":"2026-10-31T09:30:56.000Z"},"cluster":{"id":"c_9612cb9aef201137547e6065","canonicalTitle":"Claude Codeによる「既存ゲーム再現」を制限したとエンジニアが認める―オリジナル作品生成は引き続き動作する想定。“AIクローンゲーム”の抑止につながるか","representativeArticleId":"a_dc5443bd67eec0f00c5b476a","sourceCount":2,"writtenSourceCount":1,"writeAttempts":0,"isSolo":false,"entitiesJson":"{\"anime_titles\":[],\"manga_titles\":[],\"work_titles\":[],\"studios\":[],\"people\":[],\"type\":\"news\",\"domain\":\"games\",\"is_roundup\":false}","contentType":"news","status":"published","firstSeenAt":"2026-10-31T08:45:35.000Z","lastSeenAt":"2026-10-31T09:25:16.000Z","updatedAt":"2026-10-31T09:35:26.000Z"},"attribution":[{"source":"GameBusiness.jp","url":"https://www.gamebusiness.jp/article/2026/10/31/28522.html","title":"Anthropic「Claude Code」、既存ゲームの再現を制限―知的財産侵害は利用ポリシー違反、AIクローンゲーム抑止の実効性は"},{"source":"Game Spark","url":"http://www.gamespark.jp/article/2026/10/31/174341.html","title":"Claude Codeによる「既存ゲーム再現」を制限したとエンジニアが認める―オリジナル作品生成は引き続き動作する想定。“AIクローンゲーム”の抑止につながるか"}],"entities":{"anime_titles":[],"manga_titles":[],"work_titles":[],"studios":[],"people":[],"type":"news","domain":"games","is_roundup":false},"keyFacts":["Addy Osmani said on October 31 that he added two sentences to the Claude prompt on model 5.5 barring recreation of other people's specific games.","X user chasm posted on October 30 that the rule appeared around October 27, delivered via a server-side flag named tengu_heron_brook.","Osmani said original games, genre games, and games using a user's own designs and assets are expected to continue working.","Posts on X in late September claimed Terraria and Rocket League had been recreated using model 5.5.","Osmani said adjustments will continue and asked users to report refusals on projects they hold rights to."],"pageLinks":{"healthSlugs":[],"storySlugs":[],"entities":[],"stories":[],"entitiesOk":true,"storiesOk":true}}