A developer's report
A developer announced on X on October 30 that Claude Code had introduced around October 27 a non-disableable rule for the Opus 5.5 model. According to the reconstruction, the rule allows the creation of original games, games of specific genres, or games based on the user's own materials, but prohibits reproducing an existing game, even if its name is changed or the work is presented as original.
The news was picked up by a blog of the specialist outlet gamedeveloper and was relaunched in Italy by IT之家 on October 31. The central point, for those who develop with generative AI tools, is the distinction between inspiration from a genre and reproduction of an identifiable title: the former remains permitted, while the latter is blocked at the source through instructions embedded in the model.
Anthropic's confirmation and the boundaries of the measure
The confirmation comes from Addy Osmani, a member of Anthropic's technical team, who reportedly explained that the company had added two guiding sentences to Claude Code's prompts to prevent the model from reproducing specific games belonging to others. Osmani also reportedly recalled that using Claude to infringe intellectual property rights conflicts with the platform's usage policies, while legitimate creative activities remain possible.
The relevant fact is that the restriction is presented as internal to the model's behavior, not as a filter applied after the fact to the produced code. This kind of constraint acts during generation and can therefore shape the user's requests before they translate into game assets or mechanics. At present, however, the measure appears limited to Opus 5.5 within Claude Code.
What remains to be clarified
The sources do not indicate whether the same rule has been extended to other Claude models or to all versions of Claude Code, nor do they specify the criteria by which the system recognizes a game as 'specific and existing.' It is also unknown whether automatic checks, reports, or consequences are envisaged for those who attempt to circumvent the prohibition by rephrasing the request.
The case touches on a broader issue: until now, the main assisted programming tools had not made explicit limits of this kind, and their effectiveness will depend on the transparency of the rules and on developers' ability to know the operational boundaries in advance. Without data on test cases or on complaints received, the practical scope of the measure remains to be verified.
