Claude Code Blocks Game Cloning: What Anthropic Confirmed

Anthropic has confirmed that Claude Code now steers its Opus 5.5 model away from recreating someone else's specific video game. The change, which developers noticed in late October, matters to gamers and modders because some users also report that reverse-engineering requests are being refused. Here is what is confirmed and what is still only user reports.

Quick summary

• Anthropic's Addy Osmani said on October 30 that two sentences were added to Claude Code's prompt on Opus 5.5 to stop it recreating a specific game, citing the usage policy on IP infringement.
• Original games, genre games and games built from your own designs and assets are meant to keep working.
• Tom's Hardware reports the game blocking looks limited to Claude Code combined with Opus 5.5.
• Reverse-engineering refusals are reported by users but are not covered by Anthropic's statement.

What did Anthropic actually say?

In a post on X, Osmani wrote 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, because using Claude to infringe IP is against Anthropic's usage policy. He added that original games, genre games and games built from a user's own designs and assets should keep working, that the company will keep iterating to strike the right balance, and that people whose own project was refused should send it to him.

The exact wording has not been published by Anthropic. A screenshot shared by an X user suggests the prompt tells the model to build original games and games in a genre, but not to recreate a specific existing game even if it is renamed. Tom's Hardware notes that is only a possible match, so treat it as unverified.

Why are game developers and modders upset?

AI coding tools have made it far easier to rebuild classic games, port console titles to PC or study how a game works. Tom's Hardware has reported on a surge of native PC ports built with AI-assisted reverse engineering. Developers complained on Claude Code's GitHub repository that the assistant refused to work on their games or on reverse-engineering tasks. Nothing about this affects normal play: you do not need an AI model to run any game on GameDrop's launch calendar.

Is reverse engineering blocked too?

Not officially, but reports are mounting. Tom's Hardware says former staffer Jarred Walton found software checks that worked until October 31 stopped working with Opus 5.5 in Claude Code, and switching to Opus 4.8 let him continue. Another report describes a request to reverse engineer a product activation triggering safeguards. A Reddit user claims an account was suspended and later reinstated after using Opus 5.5 with a reverse-engineering toolkit. These are individual accounts, and Anthropic has not addressed them directly. The company runs a Cyber Verification Program for approved users on security work.

Does this affect people making their own games?

According to Anthropic, no. Building an original game, a game in a familiar genre, or one using your own art and design should still work. The restriction targets recreating a named existing game. Because the rule is a short prompt instruction, it can misfire on legitimate projects, which is why Anthropic invited users to report false refusals.

Can people work around it?

Tom's Hardware suggests the block seems tied to the Claude Code and Opus 5.5 pairing, so other harnesses or older models may behave differently. That is the outlet's inference, not an Anthropic statement, and using a workaround to copy a commercial game could still breach the usage policy and copyright law.

What it means for gaming

The episode shows AI labs drawing lines around IP just as AI tools reshape game development. It follows our coverage of AI's growing role in games, including Steam AI disclosures. Expect more clarification from Anthropic as it iterates on the rule.

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