leanstral-15

Name: leanstral-15
Author: Mistral AI

apache-2.0

An updated Lean 4 formal proof engineering model optimised for automated theorem proving and autoformalization. 119B total parameters, 6.5B active.

Context

256K

Capabilities

Show unsupported (5)

Reasoning & Interaction

Tool Calling

Infrastructure

Streaming

Fine-tuning

Creatormistral

Family—

Licenseapache-2.0

Statusactive

Type—

Input modalitiestext, image

Output modalitiestext

Open weightYes

Parameters—

Architecture—

Context window256K tokens

Max input—

Max output—

Reasoning tokens—

Knowledge cutoff—

Release date—

Sourceofficial

Function Callingfunction_calling

Call external functions and APIs

GET/v1/models/mistral/leanstral-15

An updated Lean 4 formal proof engineering model optimised for automated theorem proving and autoformalization. 119B total parameters, 6.5B active.

Changes · 3 entries

leanstral-15createca7a400Nov 2, 2026, 03:02 AM

leanstral-15update118451aSep 24, 2026, 07:08 AM

page_urlhttps://docs.mistral.ai/models/model-cards/leanstral-1-5→https://docs.mistral.ai/models/leanstral-1-5

leanstral-15create53ef452Jul 9, 2026, 02:32 AM