Leanstral

Leanstral

Mistral AI
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About

Leanstral is an open-source code agent developed by Mistral AI specifically designed to work with the Lean 4 proof assistant. The model focuses on generating code while also formally verifying its correctness against strict mathematical or software specifications. Unlike traditional coding assistants, Leanstral integrates directly with formal proof systems to ensure that generated code satisfies defined logical requirements. Its architecture is optimized for proof engineering tasks and operates efficiently with sparse model parameters. Leanstral is released under the Apache 2.0 license, making it freely accessible for developers, researchers, and organizations to use and customize. The model is designed to operate within real-world formal repositories rather than isolated problem environments. By combining code generation with formal verification, Leanstral aims to reduce the need for manual human review in complex software and mathematical development.

About

Tülu 3 is an advanced instruction-following language model developed by the Allen Institute for AI (Ai2), designed to enhance capabilities in areas such as knowledge, reasoning, mathematics, coding, and safety. Built upon the Llama 3 Base, Tülu 3 employs a comprehensive four-stage post-training process: meticulous prompt curation and synthesis, supervised fine-tuning on a diverse set of prompts and completions, preference tuning using both off- and on-policy data, and a novel reinforcement learning approach to bolster specific skills with verifiable rewards. This open-source model distinguishes itself by providing full transparency, including access to training data, code, and evaluation tools, thereby closing the performance gap between open and proprietary fine-tuning methods. Evaluations indicate that Tülu 3 outperforms other open-weight models of similar size, such as Llama 3.1-Instruct and Qwen2.5-Instruct, across various benchmarks.

Platforms Supported

Windows
Mac
Linux
Cloud
On-Premises
iPhone
iPad
Android
Chromebook

Platforms Supported

Windows
Mac
Linux
Cloud
On-Premises
iPhone
iPad
Android
Chromebook

Audience

AI researchers, software engineers, and developers working with formal verification, proof assistants, and mathematically rigorous software development

Audience

Tülu 3 is designed for AI researchers, developers, and organizations seeking a high-performance, open-source language model for advanced reasoning, coding, and instruction-following tasks

Support

Phone Support
24/7 Live Support
Online

Support

Phone Support
24/7 Live Support
Online

API

Offers API

API

Offers API

Screenshots and Videos

Screenshots and Videos

Pricing

Free
Open source
Free Version
Free Trial

Pricing

Free
Open source
Free Version
Free Trial

Reviews/Ratings

Overall 0.0 / 5
ease 0.0 / 5
features 0.0 / 5
design 0.0 / 5
support 0.0 / 5

This software hasn't been reviewed yet. Be the first to provide a review:

Review this Software

Reviews/Ratings

Overall 0.0 / 5
ease 0.0 / 5
features 0.0 / 5
design 0.0 / 5
support 0.0 / 5

This software hasn't been reviewed yet. Be the first to provide a review:

Review this Software

Training

Documentation
Webinars
Live Online
In Person

Training

Documentation
Webinars
Live Online
In Person

Company Information

Mistral AI
Founded: 2023
France
mistral.ai

Company Information

Ai2
Founded: 2014
United States
allenai.org/tulu

Alternatives

GPT-5.5

GPT-5.5

OpenAI

Alternatives

Molmo

Molmo

Ai2
Olmo 3

Olmo 3

Ai2
Claude Opus 4.6

Claude Opus 4.6

Anthropic
Llama 2

Llama 2

Meta
Leanstral 1.5

Leanstral 1.5

Mistral AI
Olmo 2

Olmo 2

Ai2

Categories

Categories

Integrations

Baseten
BuildThatIdea
C
C#
C++
Elixir
F#
HTML
Java
JavaScript
Julia
Kotlin
Mistral AI Studio
Mistral Vibe
Python
R
Ruby
Rust
SQL
TypeScript

Integrations

Baseten
BuildThatIdea
C
C#
C++
Elixir
F#
HTML
Java
JavaScript
Julia
Kotlin
Mistral AI Studio
Mistral Vibe
Python
R
Ruby
Rust
SQL
TypeScript
Claim Leanstral and update features and information
Claim Leanstral and update features and information
Claim Tülu 3 and update features and information
Claim Tülu 3 and update features and information