File Compression & Decompression: what Claude and GPT would buy
Two AI models chose on their own, with no web access. Nobody tested these products: this is what each one says, and how to check it.
They disagree: Claude chooses WinZip and GPT chooses 7-Zip
In Software, Claude and GPT choose the same brand in 34 of 64 categories.
Claude Opus 5.5 · October 29, 2026
WinZip Pro (line)
If you are paying for an archiver, it gives strong encryption, cloud-service integration and backup-style automation on top of broad format support.
Not for: People who only open the occasional download, since Windows 11 now extracts RAR and 7z natively and 7-Zip is free.
GPT 6.1 Sol · November 10, 2026
7-Zip (brand)
Free, open-source archiving with excellent compression, broad format support, AES-256 encryption, and no advertising.
Not for: Mac users or anyone needing a polished, modern interface.
Which one fits you
creating RAR archives
RARLAB WinRAR (line)
It is the only mainstream tool that can create RAR archives, including recovery records.
Not for: Users who only need zip or 7z.
free, best compression ratio
7-Zip (line)
Its 7z format compresses very well and the tool is free and open source.
Not for: Mac users and anyone who needs cloud integration.
Mac
MacItBetter BetterZip (line)
It previews and extracts archives in Finder and handles formats macOS Archive Utility does not.
Not for: Windows users.
Check before you buy
Where to find WinZip Pro
- WinZip
- Dell
- CDW
Also seen on Amazon.
Shops seen in search results on November 11, 2026. A shop missing here may sell it too. Nothing was checked by a person.
Brands that matter
- WinZip: Paid suite with cloud and encryption features.
- RARLAB: WinRAR is required to create RAR files.
- 7-Zip: Free, open-source and very efficient.
- MacItBetter: BetterZip is a capable Mac archiver.
What to avoid
- Archive tools from unknown publishers that bundle adware.
- Relying on zip passwords without AES encryption for sensitive data.
Questions
Do I need to buy anything to open RAR or 7z files?
No: recent Windows 11 builds open them in File Explorer, and 7-Zip is free.