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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 Grok Code Fast 1?

Grok Code Fast 1 is the latest model in the Grok family, engineered to deliver fast, economical, and developer-friendly performance for agentic coding. Recognizing the inefficiencies of slower reasoning models, the team at xAI built it from the ground up with a fresh architecture and a dataset tailored to software engineering. Its training corpus combines programming-heavy pre-training with real-world code reviews and pull requests, ensuring strong alignment with actual developer workflows. The model demonstrates versatility across the development stack, excelling at TypeScript, Python, Java, Rust, C++, and Go. In performance tests, it consistently outpaces competitors with up to 190 tokens per second, backed by caching optimizations that achieve over 90% hit rates. Integration with launch partners like GitHub Copilot, Cursor, Cline, and Roo Code makes it instantly accessible for everyday coding tasks. Grok Code Fast 1 supports everything from building new applications to answering complex codebase questions, automating repetitive edits, and resolving bugs in record time. The cost structure is intentionally designed to maximize accessibility, at just $0.20 per million input tokens and $1.50 per million outputs. Real-world human evaluations complement benchmark scores, confirming that the model performs reliably in day-to-day software engineering. For developers, teams, and platforms, Grok Code Fast 1 offers a future-ready solution that blends speed, affordability, and practical coding intelligence.

Media

Media

Integrations Supported

Mistral AI

Integrations Supported

Cursor
Dessix
GitHub Copilot
Go
Grok
Grok Build
JavaScript
Kilo Code
Microsoft Foundry Models
OpenCode
OpenRouter
PHP
Python
Roo Code
Rust
Shiori
TypeScript
Visual Studio
Visual Studio Code

API Availability

API Availability

Has API

Pricing Information

Free
Open source
Free Version

Pricing Information

$0.20 per million input tokens
$0.20 per million input tokens
$1.50 per million output tokens
$0.02 per million cached tokens
Free Version
Free Trial Offered?

Supported Platforms

Windows
Mac
On-Prem
Linux

Supported Platforms

SaaS
Windows
Mac
Linux

Customer Service / Support

Not specified

Customer Service / Support

Web-Based Support

Training Options

Documentation Hub

Training Options

Documentation Hub

Company Facts

Organization Name

Mistral AI

Date Founded

2023

Company Location

France

Company Website

mistral.ai

Company Facts

Organization Name

SpaceXAI

Date Founded

2023

Company Location

United States

Company Website

x.ai

Categories and Features

AI Coding Agents

Not specified

AI Coding Models

Not specified

AI Models

Not specified

Categories and Features

Agentic AI

Not specified

AI Coding Agents

Not specified

AI Coding Models

Not specified

AI Models

Not specified

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