You're looking at StableBuild's Deleted PyPI mirror - where we index all deleted packages from the Python package registry.

specmatic
0.26.12

This version was deleted from PyPI around 2025-05-31. Installing fails with:
$ pip3 install specmatic==0.26.12 ERROR: Could not find a version that satisfies the requirement specmatic==0.26.12
View other deleted versions of specmatic

Install through StableBuild

You can install this package from StableBuild's PyPI snapshots from before the version was deleted:
pip3 install \ -i https://YOUR_API_KEY.pypimirror.stablebuild.com/2025-05-30/ \ specmatic==0.26.12
Sign up for StableBuild to get an API key (it's free and takes <60 seconds!)

Or, download files manually

And install manually via pip:
specmatic-0.26.12-py3-none-any.whl (54.9MB)
specmatic-0.26.12.tar.gz (54.9MB)