Leanstral 1.5

Leanstral 1.5

Mistral AI
MiMo-V2-Flash

MiMo-V2-Flash

Xiaomi Technology
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About

Leanstral 1.5 is an Apache-2.0 licensed model for practical proof engineering in Lean 4, built to make formal verification more powerful and accessible. With 119B total parameters and only 6B active parameters, it delivers a major performance upgrade for theorem proving, agentic proof engineering, and real-world code verification. Leanstral 1.5 was trained through a three-stage process: mid-training, supervised fine-tuning, and reinforcement learning with CISPO. In the multiturn environment, the model receives a theorem statement, submits a proof, gets Lean compiler feedback, and refines its approach until the proof compiles or the budget is exhausted. In the code agent environment, Leanstral works like a developer in a raw filesystem: it edits files, runs bash commands, and uses the Lean language server to inspect goals, errors, and type information in real time.

About

MiMo-V2-Flash is an open weight large language model developed by Xiaomi based on a Mixture-of-Experts (MoE) architecture that blends high performance with inference efficiency. It has 309 billion total parameters but activates only 15 billion active parameters per inference, letting it balance reasoning quality and computational efficiency while supporting extremely long context handling, for tasks like long-document understanding, code generation, and multi-step agent workflows. It incorporates a hybrid attention mechanism that interleaves sliding-window and global attention layers to reduce memory usage and maintain long-range comprehension, and it uses a Multi-Token Prediction (MTP) design that accelerates inference by processing batches of tokens in parallel. MiMo-V2-Flash delivers very fast generation speeds (up to ~150 tokens/second) and is optimized for agentic applications requiring sustained reasoning and multi-turn interactions.

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

Formal methods engineers and Lean 4 researchers who need an open model for theorem proving, proof debugging, and real-world code verification

Audience

Developers and researchers requiring a solution to build high-performance AI applications involving long-context reasoning, coding, and agentic workflows

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
Free Version
Free Trial

Pricing

Free
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/news/leanstral-1-5/

Company Information

Xiaomi Technology
Founded: 2010
China
mimo.xiaomi.com/blog/mimo-v2-flash

Alternatives

Leanstral

Leanstral

Mistral AI

Alternatives

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MiMo-V2-Omni

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DeepSWE

DeepSWE

Agentica Project
MiMo-V2-Pro

MiMo-V2-Pro

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SWE-1.5

SWE-1.5

Cognition
MiMo-V2.5-Pro

MiMo-V2.5-Pro

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Command R+

Command R+

Cohere AI

Categories

Categories

Integrations

Claude Code
Hugging Face
Xiaomi MiMo
Xiaomi MiMo Studio

Integrations

Claude Code
Hugging Face
Xiaomi MiMo
Xiaomi MiMo Studio
Claim Leanstral 1.5 and update features and information
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