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
1.0.0

This version was deleted from PyPI around 2026-05-12. Installing fails with:
$ pip3 install mistralai==1.0.0 ERROR: Could not find a version that satisfies the requirement mistralai==1.0.0
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==1.0.0
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Or, download files manually

And install manually via pip:
mistralai-1.0.0-py3-none-any.whl (209.1KB)
mistralai-1.0.0.tar.gz (106.1KB)