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What is Leanstral 1.5?

Leanstral 1.5 is a model under the Apache-2.0 license, crafted for proficient proof engineering within Lean 4, with the goal of improving both the functionality and accessibility of formal verification. This model features a remarkable total of 119 billion parameters, of which 6 billion are actively utilized, representing a major leap in efficiency for tasks related to theorem proving, agent-based proof engineering, and practical code verification. The evolution of Leanstral 1.5 included an extensive three-phase training regimen, which encompassed mid-training, supervised fine-tuning, and reinforcement learning through CISPO. In a multiturn environment, the model is designed to accept a theorem statement, propose a proof, and iteratively adjust its strategy based on input from the Lean compiler until the proof compiles successfully or resources run out. Operating in the code agent framework, Leanstral acts similarly to a developer navigating through a file system, enabling it to modify files, run bash commands, and engage with the Lean language server to track goals, errors, and type information in real time. This cutting-edge methodology not only simplifies the proof engineering workflow but also significantly enriches the overall user experience in formal verification tasks, making the process both more efficient and user-friendly. Furthermore, the integration of these capabilities positions Leanstral 1.5 as a transformative tool in the landscape of formal verification.

What is Kimi K2.5?

Kimi K2.5 is an advanced multimodal AI model engineered for high-performance reasoning, coding, and visual intelligence tasks. It natively supports both text and visual inputs, allowing applications to analyze images and videos alongside natural language prompts. The model achieves open-source state-of-the-art results across agent workflows, software engineering, and general-purpose intelligence tasks. With a massive 256K token context window, Kimi K2.5 can process large documents, extended conversations, and complex codebases in a single request. Its long-thinking capabilities enable multi-step reasoning, tool usage, and precise problem solving for advanced use cases. Kimi K2.5 integrates smoothly with existing systems thanks to full compatibility with the OpenAI API and SDKs. Developers can leverage features like streaming responses, partial mode, JSON output, and file-based Q&A. The platform supports image and video understanding with clear best practices for resolution, formats, and token usage. Flexible deployment options allow developers to choose between thinking and non-thinking modes based on performance needs. Transparent pricing and detailed token estimation tools help teams manage costs effectively. Kimi K2.5 is designed for building intelligent agents, developer tools, and multimodal applications at scale. Overall, it represents a major step forward in practical, production-ready multimodal AI.

Media

Media

Integrations Supported

APIFree
AiAssistWorks
Alibaba AI Coding Plan
Cherry Studio
EaseMate AI
Hermes Agent
Kimi Claw
NVIDIA TensorRT
Oh My OpenAgent
Okara
OpenClaw
OpenCode
Oxlo.ai
Pi Agent
PrivatClaw
Rapid Claw
Shiori
SiliconFlow
Together AI
ZooClaw

Integrations Supported

APIFree
AiAssistWorks
Alibaba AI Coding Plan
Cherry Studio
EaseMate AI
Hermes Agent
Kimi Claw
NVIDIA TensorRT
Oh My OpenAgent
Okara
OpenClaw
OpenCode
Oxlo.ai
Pi Agent
PrivatClaw
Rapid Claw
Shiori
SiliconFlow
Together AI
ZooClaw

API Availability

Has API

API Availability

Has API

Pricing Information

Free
Free Version
Free Trial Offered?

Pricing Information

Free
Open source
Free Version
Free Trial Offered?

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/news/leanstral-1-5/

Company Facts

Organization Name

Moonshot AI

Date Founded

2023

Company Location

China

Company Website

platform.moonshot.ai/

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