Anthropic confirms Claude Code now steers away from cloning existing games

The big picture: Game Developer reports that Anthropic's Addy Osmani, a member of technical staff, posted a statement on X on October 30, 2026. An Anthropic spokesperson pointed the outlet to that post.

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 our usage policy." IP means intellectual property, the legal ownership of creative work like a game.

Claude Code is Anthropic's coding assistant. A prompt is the hidden set of instructions an AI model reads before it reads yours.

What's next: Osmani said original games, genre games, and games built from your own designs and assets "are meant to keep working." He added that Anthropic will "continue to iterate to ensure we're striking the right balance."

He also invited users to report mistakes: "if Claude turns down something that's yours, send it my way."

So the line Anthropic draws is between making a game and copying a particular one. A platformer of your own is fine. A one-to-one rebuild of someone else's hit is not.

The catch: Anthropic has not published the two sentences. Both Game Developer and Tom's Hardware point to a post by an X user called Chasm, who shared what looks like the rule.

Game Developer says it sits in Claude Code's settings under the label "tengu_heron_brook" and was pushed around October 27. It reads: "Do build original games, games in a genre, and games from the user's own designs and assets. Do not build a recreation of a specific existing game, even if it is renamed or called original."

Chasm reports there is no way to switch the rule off. Treat these details as reported, not confirmed. Tom's Hardware notes that, given Osmani's wording, the shared text is plausible.

Why it matters: Game Developer says fear of fast AI-made copies has spread among independent developers in recent weeks. Users have been making their own versions of classic and upcoming games, sometimes for fun and sometimes for money.

Two examples from its report:

• A cancelled playtest: Digital Sun Games called off a public playtest of its upcoming game ReVamp, worried someone might feed the demo into an AI tool and ship a copy.
• Pressure on Steam: developers asked Valve how it will stop clones from pushing out the original games. Valve gave a rare explanation to developers in South Korea earlier this week.

For a small studio, being copied before launch is a serious fear. That is the background to Anthropic's move.

By the numbers: Not according to users. Tom's Hardware says complaints are growing, including reports on Claude Code's GitHub page of the assistant refusing game work and reverse engineering tasks. Reverse engineering means taking a finished program apart to understand how it works.

The outlet's examples:

• A former staffer: Jarred Walton said his software checks ran fine until October 31. Switching to Opus 4.8 let him continue.
• A screenshot: an acquaintance of a staffer asked Opus 5.5 in Claude Code to reverse engineer a product activation, and the safeguards triggered.
• A Reddit user: said to have had their account suspended and then reinstated after using Opus 5.5 with a tool called Reverse Engineer Anything.

These are user reports. Osmani's statement covers games only. Tom's Hardware guesses Anthropic may be adjusting cybersecurity-related rules too, and points to the company's Cyber Verification Program, where approved groups get the full security abilities of its top models. That is the outlet's theory, not a confirmed fact.

Background: Tech outlet tbreak, citing a Kotaku interview, says Opus 5.5 became the centerpiece of a wave of AI-assisted game decompilations. To decompile is to turn a finished game back into readable code. Anthropic released Opus 5.5 on September 22.

The wave included browser ports, mash-up mods and Switch-to-PC ports, according to that report. It also said publishers' takedown notices were filling GitHub's DMCA logs, including a request on October 7 from Mega Crit, which said a repository held unreleased source code for Slay the Spire II. A DMCA notice is a legal request to remove copyrighted material.

Dr Luke Dicken, Take-Two's former head of AI, told Kotaku the trend is something developers and publishers must take seriously. He expects it to push the industry toward more invasive DRM (copy protection) and streaming.

The catch: Not at first. Crypto Briefing reported on October 30 that no announcement came with the change. Developers found it by running into it, and the rule lives on Anthropic's servers rather than inside the installed tool.

That outlet also noted the rule did not appear in Anthropic's broader usage policy update, which takes effect on November 12, 2026. Osmani's statement came after that, and it ties the rule to the existing policy on intellectual property.

Reaction has been split, Crypto Briefing says. Some developers welcome a limit on low-effort clones flooding online stores. Others say they are weighing alternative AI models. Its own take is that unannounced rules make it harder to build reliable workflows on any AI tool.

The catch: Tom's Hardware thinks the game blocking is limited to the mix of Claude Code and Opus 5.5. If so, users could call Opus through another tool, such as Ollama, or pass requests through a wrapper program.

Game Developer is skeptical the rule will stop much. It says the rule "may only deter the most low-effort copycats," because researchers and reporters have repeatedly shown that safety limits on AI tools can be dodged with rhetorical tricks.

It also asks a fair question: how would the software know whether a user owns a game idea or its assets? Some users replying to Chasm said cloners could simply move to models that are open-weight, which means anyone can download and run them, with no such rule.

In real life Imagine asking a very fast intern to build a game. They are happy to build yours. If you hand over a famous game and say "make this, but rename it," the intern now says no.

• If you make your own games with Claude, nothing should change. Original and genre games are meant to keep working.
• If you were rebuilding an existing game, expect Claude Code on Opus 5.5 to refuse.
• If you do reverse engineering or security work, you may hit refusals. Tom's Hardware says Opus 4.8 worked for one user, but that can change.
• If you think Claude wrongly refused your own project, Anthropic says to report it, because the rules are still being tuned.