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Description

GPT-5.4-Cyber is a tailored variant of GPT-5.4, specifically created to enhance defensive cybersecurity operations, which empowers security experts to more adeptly analyze, identify, and address vulnerabilities. This model has been fine-tuned to reduce the restrictions placed on legitimate security tasks, facilitating more in-depth involvement in areas such as vulnerability research, exploit analysis, and secure code assessments that are often limited in standard models. One of its standout features is the ability to perform binary reverse engineering, enabling the examination of compiled applications without needing the source code to uncover potential malware, vulnerabilities, and evaluate the overall strength of systems. Furthermore, it operates within OpenAI’s Trusted Access for Cyber (TAC) initiative, distributing its capabilities through a structured access framework that mandates identity verification and levels of trust, thereby ensuring that only approved defenders, researchers, and organizations are granted access to its most sophisticated functionalities. This approach not only enhances security measures but also fosters a more collaborative environment for cybersecurity professionals.

Description

Leanstral 1.5 is a model licensed under Apache-2.0, designed for effective proof engineering in Lean 4, aimed at enhancing the capabilities and accessibility of formal verification. It boasts a total of 119 billion parameters, with 6 billion of them being active, marking a significant improvement in performance for tasks such as theorem proving, agent-based proof engineering, and the verification of practical code. The development of Leanstral 1.5 involved a comprehensive three-stage training process, which included mid-training, supervised fine-tuning, and reinforcement learning utilizing CISPO. In a multiturn environment, the model is tasked with receiving a theorem statement, submitting a proof, and refining its approach based on feedback from the Lean compiler until the proof is either successfully compiled or the available resources are depleted. In the code agent setting, Leanstral functions similarly to a developer navigating a raw filesystem, allowing it to edit files, execute bash commands, and interact with the Lean language server to monitor goals, errors, and type information in real time. This innovative approach not only streamlines the proof engineering process but also significantly enhances the user experience in formal verification tasks.

API Access

Has API No 

API Access

Has API Yes 

Screenshots View All

Screenshots View All

Integrations

GPT-5.4 Yes 
GPT-5.5 Yes 
GPT-5.5 Pro Yes 
GPT-5.6 Luna Yes 
GPT-5.6 Sol Yes 
GPT-5.6 Sol Ultrafast Yes 
GPT-5.6 Terra Yes 
GPT-6 Astra Yes 
GPT-6 Luna Yes 
GPT-6 Sol Yes 
GPT-6.1 Sol Yes 
Holo4 Yes 

Integrations

GPT-5.4 No 
GPT-5.5 No 
GPT-5.5 Pro No 
GPT-5.6 Luna No 
GPT-5.6 Sol No 
GPT-5.6 Sol Ultrafast No 
GPT-5.6 Terra No 
GPT-6 Astra No 
GPT-6 Luna No 
GPT-6 Sol No 
GPT-6.1 Sol No 
Holo4 No 

Pricing Details

Free
Free Trial Yes 
Free Version Yes 

Pricing Details

Free
Free Trial No 
Free Version Yes 

Deployment

Web-Based Yes 
On-Premises No 
iPhone App No 
iPad App No 
Android App No 
Windows No 
Mac No 
Linux No 
Chromebook No 

Deployment

Web-Based Yes 
On-Premises No 
iPhone App No 
iPad App No 
Android App No 
Windows No 
Mac No 
Linux No 
Chromebook No 

Customer Support

Business Hours No 
Live Rep (24/7) No 
Online Support Yes 

Customer Support

Business Hours No 
Live Rep (24/7) No 
Online Support Yes 

Types of Training

Training Docs Yes 
Webinars No 
Live Training (Online) Yes 
In Person No 

Types of Training

Training Docs Yes 
Webinars No 
Live Training (Online) No 
In Person No 

Vendor Details

Company Name

OpenAI

Founded

2015

Country

United States

Website

openai.com/index/scaling-trusted-access-for-cyber-defense/

Vendor Details

Company Name

Mistral AI

Founded

2023

Country

France

Website

mistral.ai/news/leanstral-1-5/

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