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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 ERNIE X1.1?

ERNIE X1.1 represents a significant advancement in Baidu’s line of reasoning models, offering major gains in accuracy and reliability. It improves factual accuracy by 34.8%, instruction following by 12.5%, and agentic capabilities by 9.6% compared to ERNIE X1. These enhancements place it above DeepSeek R1-0528 in benchmark evaluations and on par with leading frontier models such as GPT-5 and Gemini 2.5 Pro. The model leverages the foundation of ERNIE 4.5 while adding extensive mid-training and post-training optimizations, including reinforcement learning to refine reasoning depth. With a focus on reducing hallucinations, it produces more trustworthy outputs and follows user instructions with higher fidelity. Its improved agentic functions mean it can handle more complex, action-driven workflows like planning, chained reasoning, and task execution. Developers and businesses can integrate ERNIE X1.1 into their systems through ERNIE Bot, the Wenxiaoyan app, or the Qianfan MaaS platform’s API. This makes it adaptable for enterprise use cases such as customer support automation, knowledge management, and intelligent assistants. The model’s transparency and output reliability position it as a competitive alternative in the global AI landscape. By combining accuracy, usability, and advanced reasoning, ERNIE X1.1 establishes itself as a trusted solution for high-stakes applications.

Media

Media

No images available

Integrations Supported

C
C#
Clojure
ERNIE 4.5
ERNIE Bot
F#
Go
HTML
JavaScript
Julia
Kotlin
PHP
Python
R
Ruby
Rust
SQL
Scala
TypeScript
Visual Basic

Integrations Supported

C
C#
Clojure
ERNIE 4.5
ERNIE Bot
F#
Go
HTML
JavaScript
Julia
Kotlin
PHP
Python
R
Ruby
Rust
SQL
Scala
TypeScript
Visual Basic

API Availability

Has API

API Availability

Has API

Pricing Information

Free
Free Trial Offered?
Free Version

Pricing Information

Pricing not provided.
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/news/leanstral-1-5/

Company Facts

Organization Name

Baidu

Date Founded

2000

Company Location

China

Company Website

yiyan.baidu.com

Categories and Features

Categories and Features

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