leanstral-2603

Name: leanstral-2603
Author: Mistral AI

apache-2.0

Our first open-source code agent designed for Lean 4, built for formal proof engineering in realistic repositories. 119B parameters with 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-2603

Our first open-source code agent designed for Lean 4, built for formal proof engineering in realistic repositories. 119B parameters with 6.5B active.

Changes · 3 entries

leanstral-2603createca7a400Nov 2, 2026, 03:02 AM

leanstral-2603update118451aSep 24, 2026, 07:08 AM

page_urlhttps://docs.mistral.ai/models/model-cards/leanstral-26-03→https://docs.mistral.ai/models/leanstral-26-03

leanstral-2603create80c574aJun 3, 2026, 07:05 AM