Anthropic Adds Rule Barring Claude From Recreating Existing Games
Addy Osmani, involved in development of Anthropic's AI coding tool Claude, said on X on October 31 that he added two sentences to the Claude prompt on model 5.5 directing it not to recreate other people's specific games.
1 source 1h ago
Reporting from 1 source: Game Spark.
Why it matters
The rule answers a complaint that AI tools could produce close copies of existing games on request, but it leaves the enforcement to a prompt instruction delivered from Anthropic's servers with no user-side switch.
Key Facts
- Addy Osmani said on October 31 that he added two sentences to the Claude prompt on model 5.5 barring recreation of other people's specific games.
- X user chasm posted on October 30 that the rule appeared around October 27, delivered via a server-side flag named tengu_heron_brook.
- Osmani said original games, genre games, and games using a user's own designs and assets are expected to continue working.
- Posts on X in late September claimed Terraria and Rocket League had been recreated using model 5.5.
- Osmani said adjustments will continue and asked users to report refusals on projects they hold rights to.
Original games, genre games, and games built with a user's own designs and assets are expected to keep working. Users had reported the rule arriving around October 27.
The restriction was first spotted by X user chasm, who posted on October 30 that a rule had appeared around October 27, distributed from Anthropic's servers under a flag named tengu_heron_brook with no user-side setting to turn it off. The rule tells users they may build original games, games in specific genres, and games using their own designs and assets, but should not recreate certain existing games even under a changed name or a claim of originality.
Osmani, replying to that post, said he added the two sentences and that further adjustments will follow to find an appropriate balance. He asked users to report cases where Claude refuses to build something they hold rights to before the tuning is finished. Recreations of Terraria and Rocket League using model 5.5 had been circulating on X in late September, and chasm asked whether the rule would also reach remakes and mods.
Written with AI by Yomimono from the 1 cited source below, including Japanese-language reporting where cited. See our editorial policy.
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