General Tech

Leanstral 1.5

By vetronauta

hacker-news1d ago · Jun 30, 20261 min read

Image courtesy of hacker-news

Article URL: https://docs.mistral.ai/models/model-cards/leanstral-1-5-26-06 Comments URL: https://news.ycombinator.com/item?id=48738938 Points: 119 # Comments: 26

Cat

June 30, 2026

v1.5

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

Speed

Performance

Modalities

Context

256k

Price

Speed

Performance

Modalities

Context

256k

Price

Features

Chat Completions

Function Calling

Agents & Conversations

Built-In Tools

Structured Outputs

Predicted Outputs

Prefix

OCR

Annotations - Structured

BBox Extraction

Document QnA

FIM

Embeddings

Moderations

Chat Moderations

Transcriptions

Text to Speech

Timestamps

Batching

Leanstral 1.5

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