Anthropic blocks Claude Code from cloning existing video games
Anthropic has updated its Claude Code coding assistant, adding two sentences to the system prompt for the Opus 5.5 version that prevent the tool from recreating existing video games. Employee Addy Osmani confirmed on X that the rule, which has been active for several days, blocks clones even when they are renamed or presented as original works. Users may still develop their own games, genre…
Key points
- Anthropic added two sentences to Claude Code's Opus 5.5 prompt to block cloning of existing games.
- The rule blocks clones even when renamed, but still allows original‑style games with custom assets.
- The move follows a surge of AI‑generated browser ports of titles like Halo and GTA Vice City using Opus 5.5 and GPT‑6 Astra.
The policy change follows a surge of AI‑generated cloning projects, with developers using Opus 5.5 and GPT‑6 Astra to produce hundreds of unofficial browser ports of popular titles such as Halo and GTA Vice City. Tools like Reverse Engineer Anything pair AI agents with reverse‑engineering to turn native binaries into readable pseudocode, and a developer recently recreated parts of Adobe’s Creative Cloud apps. Sony’s PlayStation 5 also became a target after a jailbreak sparked a wave of emulators. Osmani said Anthropic plans to keep tweaking the rules going forward.
Model page: GPT-6 Astra →
The story so far
3 episodes →- Anthropic blocks Claude Code from cloning existing video gamesthis story
Anthropic cracks down on game cloning in Claude Code after wave of AI-built knockoffs
The Decoder · 3 November 2026
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