Image: Anthropic
Developers who have been using Anthropic's Claude models to build Pokémon fan games and ROM hacks say the assistant is now refusing that work. The refusals arrived without a public, Pokémon-specific announcement, and they show how an AI lab's usage rules can decide which fan projects still get built.
This site reported on October 31 that Anthropic had added a Claude Code rule steering the tool away from recreating a specific existing video game. That earlier story is the background to what fan developers are hitting now.
GoNintendo, Retro Dodo, and GamersExtra report that Claude will not help recreate a specific Pokémon game, even if the project is renamed or described as original. The same coverage says Claude also refuses to draw or use Pokémon characters or copy their designs in code, SVG, or sprites, and will not use Pokémon-branded names, logos, or mascots. Retro Dodo's Brandon Saltalamacchia wrote that when he asked why the rules had changed, Claude said its instructions do not carry dates or a change history.
One of the first developers to speak up was Big Kid Nation, who is building Pokémon Arena 2D, a real-time battle game inspired by pixel-era Pokémon sprites. In a November 11 post, the developer wrote, "Anthropic has cracked down and Claude models are starting to refuse work on Pokemon fan projects." The post said the game is still set for December. GamesRadar later reported that Big Kid Nation had described spending "up to $2,000" a month in expenses on the fan game, and quoted the developer saying, "Our game is still set for December. Don't worry."
Anthropic has cracked down and Claude models are starting to refuse work on Pokemon fan projects.
— Big Kid Nation (@BigKidNation) November 11, 2026
All that money spent, never took a cent (unlike many others with itch io, patreon etc)
Nintendo. Just make the epic Pokemon game you know we all want.
I'll live on the street and work for free if it helps.
Our game is still set for December. Don't worry.
The likely cause is a broader instruction added to Claude Code for Opus 5.5 in late October, not a separate public rule about Pokémon. An X user named chasm first posted the wording on October 30 and said Claude Code had picked up the rule around October 27. The two sentences read, "Do build original games, games in a genre, and games from the user's own designs and assets. Don't build a recreation of a specific existing game, even if it is renamed or called original."
Addy Osmani, a member of technical staff at Anthropic who works on Claude Code, confirmed the change the same day. Game Developer reported that an Anthropic spokesperson pointed to Osmani's post when asked for comment. UK PCMag later described him the same way. Osmani wrote that Anthropic added two sentences to Claude Code's prompt on Opus 5.5 "to steer it away from recreating someone else's specific game because using Claude to infringe IP is against our usage policy." He said original games, genre games, and games built from a user's own designs and assets were meant to keep working, that Anthropic would "continue to iterate," and that people should send him cases where Claude turns down work that is theirs.
We added two sentences to Claude Code's prompt on Opus 5.5 to steer it away from recreating someone else's specific game because using Claude to infringe IP is against our usage policy.
— Addy Osmani (@addyosmani) October 30, 2026
Original games, genre games, and games built from your own designs and assets are meant to keep working.
We'll continue to iterate to ensure we're striking the right balance. In the meantime, if Claude turns down something that's yours, send it my way.
There was no separate product changelog or blog post announcing the instruction. On November 4, Osmani posted an update. He said the short rule had also been kicking in when people named an existing game only to describe the mechanics they wanted, and that Anthropic had updated the rule in Claude Code 2.1.317. Under the revised wording, Claude should build an original game in that genre when a title is used as a reference, and should offer to build something similar if asked for a copy of the original. Tom's Hardware covered that follow-up as a loosening of the earlier restriction. The ban on recreating a specific existing game was not withdrawn.
Reports of Pokémon-related refusals were widely posted on November 11, after that update, and were still appearing at the time of this writing. There is no public sign that the underlying restriction has been rolled back.
The November 11 coverage also included GamesRadar and PCMag. Earlier GitHub issues in the Claude Code repository, and reporting by Tom's Hardware, suggested the same change also caught some reverse-engineering work. A later hands-on piece in UK PCMag, updated November 7, said decompiling and reverse engineering still worked in the author's tests.
No Pokémon-specific statement from Anthropic was found. There is also no confirmed public statement from Nintendo or The Pokémon Company about the change.
Osmani has said Anthropic wants Claude to remain useful for original work while blocking the use of the model to infringe IP. For fan developers whose projects depend on Pokémon names, designs, or logos, the practical result at the time of this writing is that Claude will not help them finish those games.
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