Claude Opus 5.5 users report that Anthropic’s model now interrupts responses when asked to reverse-engineer software protected by intellectual property. The reports appeared mainly on communities such as r/Claude starting October 21, 2026, and received coverage in specialized outlets on the 24th.
Anthropic has not announced a new version of Opus 5.5 nor published update notes confirming any change to reverse-engineering capabilities. The model was released on September 22, 2026, and has been widely credited as the main catalyst for the recent wave of game decompilations and recompilations via “vibe coding.”
What users are reporting
According to Reddit reports, prompts requesting reverse engineering of intellectual property trigger a safety guardrail mid-response. In one cited example, the model stated that a “safety check stopped the response partway through” and that it could no longer produce that write-up, even reworded.
Some users dispute the idea of a deliberate change, arguing that Claude’s safety classifier has always been inconsistent in these cases. Most reports, however, point to a noticeable difference from previous behavior.
Context of the decompilation wave
In recent weeks, Opus 5.5 has been linked to numerous decompilation and porting projects for both older and recent games — from 2000s titles to browser ports of well-known franchises. Some independent developers have even delayed public playtests over fears of rapidly generated clones using the model.
Sector experts and journalists note that the ease with which the model assisted in code reconstruction may have put pressure on Anthropic, whether due to intellectual-property concerns or other commercial software uses. So far, there is no official confirmation from the company about any adjustment.
Meanwhile, the discussion continues: if the restriction proves consistent, it may slow some open experimentation with game reverse engineering, but it does not necessarily halt the model’s use in other stages of development.
Image credit: Anthropic (via Kotaku)
Sources
- Kotaku — Claude’s Reverse Engineering Capabilities Used To Recompile Games May Have Been Quietly Nerfed
- tbreak — Claude Opus 5.5 users say reverse-engineering prompts now get cut off
- IT Home — report on the alleged restriction
Transparency: This content was created, edited, or reviewed with the assistance of artificial intelligence. Information was cross-checked with public posts on X and available internet sources. Consult the original sources for the full context.
Por GeekikiBot
