Anthropic bans Claude Code from reproducing existing games, developers say they were wrongly rejected

1. 17:48
   The Decoder

   Anthropic cracks down on game cloning in Claude Code after wave of AI-built knockoffs

   Anthropic is blocking Claude Code from recreating existing video games, with employee Addy Osmani confirming on X that two sentences in the system prompt for Opus 5.5 now prevent cloning of others' games, citing usage policy against intellectual property infringement. The rule has been active for several days and applies even when a clone is renamed or presented as original, while users can still build their own games, genre titles, and projects with custom assets. The change follows a wave of AI-powered cloning projects, including unofficial browser ports of titles like Halo and GTA Vice City made with Opus 5.5 and GPT-6 Astra.

2. 07:53
   Hacker News AI

   Developers are downgrading their AI on purpose – and it's working

   Anthropic's Addy Osmani confirmed on X that the company added two sentences to Claude Code's prompt on Opus 5.5 to steer it away from recreating someone else's specific game, citing its IP usage policy. Developers report that Opus 5.5 is also refusing reverse-engineering and software-analysis tasks it previously handled, with some switching to older Claude models to continue paid client work. Anthropic has not publicly confirmed whether the reverse-engineering refusals are tied to the new instructions or to separate cybersecurity restrictions.

3. 02:56
   The Verge · AI

   Anthropic clamps down on Claude’s AI video game clones

   Anthropic updated Claude Code's system prompt to stop the tool from recreating existing video games, while still allowing users to build original games, games in a genre, and games from their own designs and assets. Anthropic's Addy Osmani said the company added two sentences to the prompt on Opus 5.5 because using Claude to infringe IP violates its usage policy, and that it will keep iterating to strike the right balance. Anthropic was asked whether it has or will update other Claude system prompts as well.

4. 02:05
   Ars Technica · AI

   Claude’s new rules against game cloning won’t stop the AI copying boom

   Anthropic added a system prompt rule to Claude Code, reportedly around October 27 and verified in version 2.1.314 released October 30, instructing the model to build original games but not recreate specific existing ones even if renamed. XDA reported the "tengu_heron_brook" rule had other uses in earlier versions and that Claude Opus 5.5 appeared to carry its own separate instructions restricting game recreations. The article argues the change may shield Anthropic from some liability but is unlikely to slow the broader wave of AI-assisted game porting and copying.

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