Anthropic updates Claude Code to block recreating specific games

New guardrails for game code

Anthropic recently updated the instructions for Claude Opus 5.5 within its Claude Code tool. The company added two specific sentences to the prompt to ensure the AI avoids generating code that recreates other people's existing games. This move is designed to align the tool more closely with Anthropic's existing policy against infringing on intellectual property rights.

Addy Osmani of Anthropic revealed the change in a post on October 30, 2026. He clarified that the update is not a general ban on game development. Users can still use the tool to create original games, explore specific genres, or build projects based on their own unique designs and assets.

The goal is to distinguish between creating something new and copying a specific work. For example, building a game that uses mechanics common to a genre is still permitted. The restriction is specifically targeted at recreating a particular party's existing work, even if the user attempts to change the name or describe it as an original creation.

How the restriction works

The change is positioned as an alteration to the instructions given to the model during the code generation process. Anthropic has not stated that the underlying model was retrained or that the terms of service were officially changed. Instead, it is a more concrete way of reflecting the company's usage policy in responses related to game development.

Because the instructions are part of the prompt, the AI is meant to check its own output against these rules. However, the technical implementation of these checks can sometimes lead to unexpected results. Some users have noted that the tool may refuse work even when there is no intent to copy a copyrighted product.

Anthropic explains that a refusal does not necessarily mean the company has judged a user's content as inappropriate. The mechanism is designed to prevent copying, which can sometimes trigger a block even when a user is working on a legitimate project. The company is currently working to balance these protections against the need to support original creative work.

Impact on contract developers

Reports on GitHub suggest that the new instructions might be reaching situations they were not intended to cover. One user reported being refused work on a game-related contract project for a client. The user, who runs a business producing digital modules for board wargames, stated they were writing original code based on materials supplied by the customer.

In this specific case, the user clarified that they were not producing the modules under a formal license from the publishers. While the customer owned the game, the absence of a publisher license does not automatically make the work illegal. This highlights the difficulty AI faces when trying to judge complex legal relationships and creative intent.

The user noted that the refusals began after they specifically asked the model about the new instructions. This suggests that the model's self-checking of its own criteria might be connected to the blocks. Anthropic has not provided an independent reproduction of this issue or an explanation for why the refusal occurred in this specific instance.

Security vs. game development

It is important to distinguish these game restrictions from Anthropic's other security programs. On October 6, 2026, the company expanded the Cyber Verification Program (CVP) to include defensive reverse engineering. This program grants qualified security professionals access to advanced capabilities with fewer restrictions than the general public.

The CVP allows for tasks like malware reverse engineering and vulnerability analysis for verified users. However, these permissions do not apply to game production. Defensive malware analysis is handled under a different framework and institutional position than the rules governing the recreation of copyrighted games.

General development tasks, such as code reviews or fixing known issues in source code you own, remain available to all users. These tasks do not require special verification. The game-specific instructions are separate from these broader security access controls, though it is unclear if they are managed by the same internal mechanism.

Next steps for developers

Anthropic is looking for feedback to improve the accuracy of these new instructions. Osmani stated that the company will continue to make adjustments to balance intellectual property protection with legitimate development. He has asked users who are refused while developing their own work to send in specific examples of what happened.

For developers, the best approach is to be very clear about what is being built and how the rights are arranged. Providing context about whether a project is an original work, a genre-based project, or a port can help. Recording the specific circumstances of a refusal can also help Anthropic identify where the AI is being too restrictive.

The key challenge moving forward is how well the system can distinguish between copying and original production. While the policy of allowing original works is clear, the accuracy of the model's responses is still being refined. Users should expect some trial and error as the company tunes the balance between safety and utility.