The next move
Check whether you depend on the hosted preview or run downloaded weights yourself.
What the vendor says
Mistral’s June 30 release entry states that labs-leanstral-1-5 will retire on September 30, 2026. The entry names no successor.
Sources: Mistral API changelog · Leanstral 1.5 model documentation
Why it matters
A hosted preview dependency needs its own continuity plan. Downloaded weights and hosted API access are different dependencies.
AI-Buzz suggested checks
Turn the notice into a task.
- Locate labs-leanstral-1-5 in API configuration and request logs.
- Separate hosted calls from any locally deployed model; this notice alone does not establish a local migration requirement.
- For hosted use, confirm a supported destination with Mistral and test your proof or coding workflow before changing configuration.
What this does not establish
The original retirement-announcement date is unknown. A dated, mutable release entry does not show when retirement wording was added. No inference about weight licensing follows from this API notice.
Read the original sources
AI-Buzz checked these pages on 9 Sept 2026. This is our reading on that date. The linked pages can change; we do not reconstruct earlier versions from today’s text.
- Mistral API changelog June 30, 2026 Leanstral 1.5 entry
Review receipt
- Retrieved
- 2026-09-09T11:11:21.547819Z
- Response SHA-256
036e162a06ffbead3b0dbeaefba844d11dc6c2c25c47e565ae8fa39fb523ddbd
Manual review. Full source bytes were not retained. A hash cannot recover the page or establish when its wording changed.
- Leanstral 1.5 model documentation Hosted public preview, release date and model availability
Review receipt
- Retrieved
- 2026-09-09T11:11:21.589455Z
- Response SHA-256
cb56a8ec67de631301884fa3d1dbb3a6729c97ceeedc6cd5484ed9061681237b
Manual review. Full source bytes were not retained. A hash cannot recover the page or establish when its wording changed.