Anthropic adjusts claude code restrictions on game development, allowing reference to existing titles

Anthropic engineers have modified the constraints within Claude Opus 5.5 regarding game development. Addy Osmani, an Anthropic engineer, announced via X that the update, found in Claude Code version 2.1.317, permits users to reference existing game mechanics and gameplay descriptions without triggering an automatic refusal from the model. Previously, Anthropic had implemented two rules in the system prompt for Opus 5.5 to prevent users from replicating existing games. This restriction had caused developer frustration, as even mentioning a game for reference could lead to the model rejecting the development request. The revised guidelines now allow users to cite existing games to guide the creation of original, similar-themed games. However, the model will still decline direct replication if the user explicitly demands a copy of the original work, instead suggesting the development of a comparable experience.