Claude’s Reverse Engineering Capabilities Used To Recompile Games May Have Been Quietly Nerfed

Many people have linked the recent wave of using AI to take apart games and rebuild them to Claude Opus 5.5, Anthropic’s latest AI model, released on September 22. Now, users say the model may have quietly become much worse at what some people called its ability to “reverse engineer anything.” Reverse engineering means studying how something works so it can be recreated.

To be clear, Anthropic has not announced or released a new version of Opus 5.5. However, the company announced several updates to Claude products on October 21. This timing matches a report posted on October 21 in the r/Claude community. The report said that Opus 5.5 had become worse at reverse engineering.

Several people in the discussion said that asking Claude Opus 5.5 to reverse-engineer someone else’s intellectual property could trigger a safety system that stops the answer in the middle of a sentence. In one example, Claude said that a “safety check stopped [its] response partway through.” It also said it could no longer “produce that write-up again, even reworded.”

However, several people in the discussion disagreed that anything had changed. One person said that getting Claude to reverse-engineer something had always been unpredictable because “the classifier is just really twitchy.” A classifier is a system that sorts or judges information. Still, people who disagree that a change was made seem to be a small minority.

Would Anthropic make a change without mentioning it in Claude’s update notes? Apparently, the company does this quite often. So, it is possible that Anthropic quietly changed Opus 5.5’s reverse-engineering abilities without telling users.

Why would Anthropic make its AI less capable? I have a reasonable guess. Users on X have linked the possible change to people using Claude to modify Samsung TVs’ microphones, which are designed to stay on all the time. I doubt this alone caused the change. However, the game versions made for web browsers using AI coding tools such as Claude, along with efforts to make programs such as Adobe and Microsoft Office available as open-source software, may have influenced Anthropic’s decision.