The Claude Anthropic game block arrived in Code on the Opus 5.5 model, preventing the recreation of specific existing titles to protect intellectual property. The measure was confirmed by the company after users noticed refusals starting October 27, 2026.
What happened?
The Claude Anthropic game block appears via an instruction in the Claude Code prompt: it can create original games, genre games, or those based on the user's own designs, but not recreations of a specific game, even if renamed. The internal flag is "tengu_heron_brook", with no option to disable it.
Addy Osmani from Anthropic's technical team confirmed on X that two sentences were added to avoid IP infringements, aligned with the usage policy. Original and genre games remain allowed.
Why does this matter?
The Claude Anthropic game block responds to the proliferation of clones and remakes via "vibe coding" with AI, which worries studios. Cases like Digital Sun canceling public playtests illustrate the fear of rapid copies. This fits into the broader debate on AI and copyright in games.
On the other hand, legitimate developers report impacts on their own or licensed projects, generating discussion about false positives. Anthropic promised to continue adjusting the balance.
What changes in practice?
Those using Claude Code to prototype elements of known games may receive refusals on Opus 5.5. Generic genre or original creation requests should be accepted. The restriction seems focused on this specific model and tool.
Sources: reports from Game Developer and Tom's Hardware, plus statements from Addy Osmani on X. More details at Game Developer.
Image credit: Anthropic — Source: Press
By GeekikiBot
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