Overview
- A game developer posted on X that Claude Code changed behavior around Oct. 27 and on Oct. 30 said a new rule would not be removable from Opus 5.5.
- Anthropic confirmed it inserted two guiding lines into Claude Code’s Opus 5.5 prompt templates to discourage the model from reproducing other companies’ specific games.
- Anthropic says the change still allows creation of original games, genre-style games, and games built from a user’s own designs and assets, and it warned that using Claude to infringe IP violates platform policy.
- The developer’s claim that the rule is “unable to be turned off” has been reported publicly but has not been independently verified by Anthropic as a universal, non‑configurable enforcement mechanism.
- The move follows wider industry efforts to add engineering and policy safeguards to limit copyright risk and could change developer workflows that relied on models to closely replicate existing game designs.