---
title: "THIS IS STRAIGHT UP THE CREEPIEST THING I'VE EVER SEEN someone opened a closed-s"
url: "https://reamcp.dev/en/cases/this-is-straight-up-the-creepiest-thing-i-ve-ever-seen-someo-c7f524"
source: "https://x.com/i/status/2110038441085808738"
source_type: "x"
author: "explos1ve"
author_handle: "explosss1ve"
stars: 0
category: "Game mods & interoperability"
categories: ["game-interop"]
tags: ["ai-agents", "binary-analysis", "reverse-engineering", "showcase", "source-recovery"]
added: "2026-10-15T02:04:49.691Z"
updated: "2026-10-13T16:02:21.000Z"
locale: "en"
content_locale: "en"
---

# THIS IS STRAIGHT UP THE CREEPIEST THING I'VE EVER SEEN someone opened a closed-s

A post describing using REA with an AI model to explain how features of an app the user owns or is allowed to inspect are implemented, citing REA's showcase where a game function was recovered from a compiled binary and passed 3,205 tests.

## Description

THIS IS STRAIGHT UP THE CREEPIEST THING I'VE EVER SEEN

someone opened a closed-source app and pointed Opus 5.5 at it with REA connected.

it never asked for the source code.
it didn't need it.

it just started explaining how the app was built. feature by feature.
from the button you click, down to the exact function that does the work.
with evidence for every claim.

in ONE afternoon.

the thing companies spend years and entire legal teams protecting
got read out loud by a chat window.

and 99% of people have no idea this just happened.

here's the whole thing. it fits in 4 lines:

→ open an app you own or are allowed to inspect
→ point Opus 5.5 at it with REA connected (it's literally called Reverse Engineer Anything)
→ ask how one feature actually works
→ read the answer

that's it. Opus 5.5 does the rest.

and it's not a party trick: in REA's own showcase, one function from an old game was recovered straight from the compiled binary. it passed 3,205 test cases and compiled back to the exact same bytes.

now think about what this used to cost.

in the 80s, Compaq did this to IBM.
two teams. a room full of lawyers. months.

back then, reverse engineering took entire teams and months of painstaking work.

today, a single AI session can do in an afternoon what used to require an army of engineers.

so how many $100M startups are protected by nothing except the fact that nobody has tried to reverse engineer them yet?

## Original README

THIS IS STRAIGHT UP THE CREEPIEST THING I'VE EVER SEEN

someone opened a closed-source app and pointed Opus 5.5 at it with REA connected.

it never asked for the source code.
it didn't need it.

it just started explaining how the app was built. feature by feature.
from the button you click, down to the exact function that does the work.
with evidence for every claim.

in ONE afternoon.

the thing companies spend years and entire legal teams protecting
got read out loud by a chat window.

and 99% of people have no idea this just happened.

here's the whole thing. it fits in 4 lines:

→ open an app you own or are allowed to inspect
→ point Opus 5.5 at it with REA connected (it's literally called Reverse Engineer Anything)
→ ask how one feature actually works
→ read the answer

that's it. Opus 5.5 does the rest.

and it's not a party trick: in REA's own showcase, one function from an old game was recovered straight from the compiled binary. it passed 3,205 test cases and compiled back to the exact same bytes.

now think about what this used to cost.

in the 80s, Compaq did this to IBM.
two teams. a room full of lawyers. months.

back then, reverse engineering took entire teams and months of painstaking work.

today, a single AI session can do in an afternoon what used to require an army of engineers.

so how many $100M startups are protected by nothing except the fact that nobody has tried to reverse engineer them yet?