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What is Leanstral?

Leanstral is an open-source AI coding agent introduced by Mistral AI to support the development of formally verified software and mathematical proofs using Lean 4. The model is specifically designed for proof engineering, allowing it to generate code and automatically verify its correctness against formal specifications. Lean 4 is a powerful proof assistant used in advanced mathematics and software verification, and Leanstral is the first AI agent built specifically to operate within this environment. Instead of relying on general-purpose coding models, Leanstral is trained to work directly with formal repositories and structured proof systems. The model uses a sparse architecture with efficient active parameters, enabling it to deliver strong reasoning performance while maintaining computational efficiency. Leanstral can leverage Lean’s verification capabilities to test and validate generated solutions through parallel inference processes. This approach helps ensure that AI-generated code adheres strictly to defined logical and mathematical requirements. The model supports integration with development tools and model communication protocols, enabling it to function within broader AI-assisted coding environments. Benchmarks demonstrate that Leanstral can outperform many large open-source models in proof engineering tasks while operating at a lower cost. Its design allows developers to automatically generate proofs, verify algorithms, and build mathematically sound software implementations. Released under the Apache 2.0 license, Leanstral can be downloaded, fine-tuned, and deployed in private infrastructure. By combining automated coding with formal verification, Leanstral represents a significant step toward building trustworthy AI systems for critical software and research applications.

What is GPT-4.1?

GPT-4.1 is a cutting-edge AI model from OpenAI, offering major advancements in performance, especially for tasks requiring complex reasoning and large context comprehension. With the ability to process up to 1 million tokens, GPT-4.1 delivers more accurate and reliable results for tasks like software coding, multi-document analysis, and real-time problem-solving. Compared to its predecessors, GPT-4.1 excels in instruction following and coding tasks, offering higher efficiency and improved performance at a reduced cost.

Media

Media

Integrations Supported

Anara
BLACKBOX AI
Bind AI
C++
ClickUp Brain
Cline
Clojure
Cursor
DataGrip
Kotlin
Mistral AI Studio
Mistral Vibe
Parallel
PhpStorm
Python
Revise
SQL
Snowflake Cortex AI
TypeScript
Visual Studio Code

Integrations Supported

Anara
BLACKBOX AI
Bind AI
C++
ClickUp Brain
Cline
Clojure
Cursor
DataGrip
Kotlin
Mistral AI Studio
Mistral Vibe
Parallel
PhpStorm
Python
Revise
SQL
Snowflake Cortex AI
TypeScript
Visual Studio Code

API Availability

Has API

API Availability

Has API

Pricing Information

Free
Free Trial Offered?
Free Version

Pricing Information

$2 per 1M tokens (input)
Free Trial Offered?
Free Version

Supported Platforms

SaaS
Android
iPhone
iPad
Windows
Mac
On-Prem
Chromebook
Linux

Supported Platforms

SaaS
Android
iPhone
iPad
Windows
Mac
On-Prem
Chromebook
Linux

Customer Service / Support

Standard Support
24 Hour Support
Web-Based Support

Customer Service / Support

Standard Support
24 Hour Support
Web-Based Support

Training Options

Documentation Hub
Webinars
Online Training
On-Site Training

Training Options

Documentation Hub
Webinars
Online Training
On-Site Training

Company Facts

Organization Name

Mistral AI

Date Founded

2023

Company Location

France

Company Website

mistral.ai

Company Facts

Organization Name

OpenAI

Date Founded

2015

Company Location

United States

Company Website

openai.com/index/gpt-4-1/

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