Model Watch · Mistral

Leanstral 1.5

Free while it's in preview, Apache 2.0, 256K in and 128K out. The catch is that a preview price is a preview price.

What is Leanstral 1.5?

Leanstral 1.5 is a model from Mistral, built in France. You can call it, but the lab still calls it a preview, so expect the behavior to move.

When did Leanstral 1.5 come out?

Mistral released it on 30 June 2026. That date comes from the lab's own docs.

The tracker first logged the name on 2 July 2026 and last saw it on 15 July 2026.

What does it cost, and how much context does it hold?

List prices per million tokens, read off the lab's own docs. Caching, batching and volume deals all cut the real number, so treat this as the ceiling. Check the source before you budget against it.

At 700 words in and 500 out, twenty times a day, that works out around $0 a month. Put your own numbers in, see every Mistral price, or put it next to another model.

How does it compare to Mistral's other models?

A dash means the lab hasn't published that number for that model.

Every mention we've logged

Every tracked post, release, changelog entry or incident whose title or summary names Leanstral 1.5. Newest first, each one linking to where the lab published it.

Keep reading

The release timeline is every model we know about, filterable by lab, country and date. The tracker is the live feed these mentions come from, and Model Watch is the whole catalogue on one page.

More from Mistral:

• Mistral Medium 3.5 · released
• Mistral Small 4 · released
• Mistral Large 3 · released
• Ministral 3 14B · released
• Codestral · released

Updated 2026-09-05 12:15 UTC.