你用 Opus 5.5 做了什么项目？

So my experience has been nothing but good since using Opus 5.5 as it actually ships and finish things I started a few months ago with Codex and Opus 4.6.

Most projects I have already showed off in this Sub and others but one of the harder things that really pushed Opus 5.5 for me was doing this.

https://github.com/AlexC1991/zt1-engine

Its reverse engineering the binary of Zoo Tycoon 1, why its been hard to do has been it was create with a special single purpose engine that was built only for Zoo Tycoon 1 and encodes files in .ztd which are zip like files but can only be read by the engine that it used encrypt it. I was able to do this with models back in January 2026 but when it came to remaking the maps it hard to be drawn in real time by the CPU and are not pre-built maps just binary data and for the longest time no model was even able to read that data and understand it or pinpoint how it creates the detail of cliffs and ledges and subsurface geometry or even what tiles are matched to it for each map to create its detail.

Opus 5.5 was able to work that out in 2 hours and right now its been more trying to polish and understand how things are rendered which takes a few passes and tries to do.

For my purpose reverse engineering this game has been me wanting to play my childhood game again but launching it on modern windows basically makes it unplayable and only thing out there is OpenZT and that just modifies the current game to make it playable on modern computers. My approach is a full OpenRCT2 with a brand new engine and full control of the game and usability for modern computers.

Track my progress or contribute if you want. Mine is a fork of someone else who started the work but their building it on Linux so I am making it for Windows.

So what has everyone else been working on or find something that was almost impossible to do before with older models ?