You're looking at StableBuild's Deleted PyPI mirror - where we index all deleted packages from the Python package registry.
mistralai was reported malicious
OSV:MAL-2026-3608 - Malicious code in mistralai (PyPI)

mistralai
1.2.0

This version was deleted from PyPI around 2026-05-12. Installing fails with:
$ pip3 install mistralai==1.2.0 ERROR: Could not find a version that satisfies the requirement mistralai==1.2.0
View other deleted versions of mistralai

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/2026-05-11/ \ mistralai==1.2.0
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:
mistralai-1.2.0-py3-none-any.whl (248.5KB)
mistralai-1.2.0.tar.gz (126.0KB)