Anthropic has updated Claude Code so that its Opus 5.5 model is directed away from recreating a specific existing video game, even if the result is renamed or described as original. The company says the change is intended to prevent use of its AI coding tool for intellectual-property infringement.

The update, confirmed by Anthropic technical staff member Addy Osmani, adds two sentences to Claude Code’s prompt. It does not ban game development generally: Anthropic says original games, games within an established genre, and projects built from a user’s own designs and assets are meant to continue working.

What Claude Code will refuse

The reported instruction tells the model: “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.” The wording is designed to close a common workaround in which users ask for a “new” game while supplying enough details to reproduce a recognizable title.

We 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.

Osmani also said that original games, genre games, and games built from a user’s own designs and assets are intended to keep working, and that Anthropic will continue iterating “to ensure we’re striking the right balance.”

Why Anthropic made the change

Anthropic’s stated rationale is that using Claude to infringe intellectual property violates the company’s Usage Policy, which applies to users submitting inputs across its products and services. The policy governs acceptable use of Anthropic’s services, and Claude Code’s documentation states that use of the coding tool is subject to that policy.

The move arrives as AI-assisted “vibe coding” has made it easier for non-specialists to generate playable prototypes, ports, and modifications from natural-language prompts. Reporting on the change has linked the restriction to concerns over recreations and unofficial combinations of games, including efforts to place characters or mechanics from one title into another.

Technical scope

The confirmed restriction applies to Claude Code when used with Opus 5.5. It is implemented as prompt-level guidance rather than a publicly described technical filter, classifier, or code-analysis system. Anthropic has not published separate enforcement metrics, a list of blocked titles, or details of how borderline requests will be evaluated.

In practice, the rule distinguishes between three categories:

  • Original games, which remain permitted.
  • Games in an existing genre, such as a survival game or a first-person shooter, which remain permitted.
  • Recreations of a specific existing game, including renamed versions, which are restricted.

That distinction leaves room for interpretation. A request for “a Minecraft-like game” may be treated differently from a request to reproduce Minecraft’s specific systems, assets, progression structure, or recognizable identity. Anthropic has not specified where that boundary will be drawn in individual cases.

Reported side effects

Users have reported that Claude Code has also declined some reverse-engineering and debugging requests, including tasks that may not be intended to clone a game. Tom’s Hardware reported that developers encountered refusals involving reverse-engineering work, while noting that the extent and cause of those broader blocks had not been officially confirmed by Anthropic.

That matters because reverse engineering can serve legitimate purposes, such as compatibility work, security research, crash diagnosis, preservation, and modding. It can also be used to extract or reconstruct protected code and assets. The new instruction does not explicitly ban all reverse engineering, but early user reports suggest that the model may sometimes interpret related requests as attempts to recreate an existing title.

Industry context

The update places Anthropic alongside a broader industry debate over whether AI systems should assist with derivative works, fan projects, decompilation, and game preservation. Game publishers generally control their code, art, audio, characters, and other protected materials, while the legal status of a game’s underlying mechanics can be more limited than the status of its expressive content.

For developers, the immediate effect is uncertainty at the prompt level: Claude Code may still help build an original game, but requests that closely reference a commercial title could be refused. For Anthropic, the challenge over the next 12 to 24 months will be enforcing the rule without obstructing lawful development, debugging, accessibility work, and research.

Anthropic has not announced a timeline for further changes, additional enforcement tooling, or a formal appeals process for incorrectly blocked requests. Osmani invited users to send him cases where Claude declined work on something that was genuinely theirs, indicating that the company expects to refine the policy based on feedback.

Sources: IGN, Polygon, Yahoo Tech.