Anthropic updates Opus 5.5 to steer Claude Code away from cloning specific video games

Anthropic has added a behavioural guardrail to Opus 5.5. Claude Code will now steer away from recreating someone else's specific game and from reverse-engineering existing titles. The move follows weeks of Steam being inundated with AI-generated clones, which game-industry outlets called slop.

This is model-level steering rather than an account policy. The model recognises requests to replicate a named game's mechanics, assets or code and redirects. Opus 5.5 itself was pitched as rivalling Fable 5.1 on most tasks at 40% lower cost than Opus 5, which made it the tool of choice for cheap game cloning.

The reaction is split. Game developers largely welcomed it but doubt model guardrails can stop the flood, since open-weight models have no such limits. On r/singularity, 'Anthropic to start blocking game recreations?' drew 955 upvotes and 460 comments. On r/Anthropic, a Claude for Startups member said the new rule shut down their small business overnight, and that support's bot said there were no exceptions.

The controversy feeds a broader complaint about Anthropic enforcement this week, alongside account suspensions and blocked training work, pushing r/LocalLLaMA users toward owning compute. Watch whether Anthropic publishes clearer guidance on what counts as a 'specific game' and adds an appeals path.