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Hitachi and OpenAI are extending their collaboration to apply AI to core system modernization and defensive cybersecurity.
Hitachi announced that it will expand its work with OpenAI to help accelerate AI-driven modernization and cybersecurity. The work combines OpenAI’s frontier AI technology with Hitachi’s domain expertise in mission-critical systems and social infrastructure.
The expanded work focuses on three areas:
Developing an AI-driven modernization approach for mission-critical legacy systems.
Using OpenAI’s cybersecurity models for legitimate defensive purposes, with safeguards and human oversight.
Applying insights from the work to help strengthen Hitachi’s FDE capabilities and enhance HMAX.
The companies’ Forward Deployed Engineer teams will use OpenAI’s AI agent, Codex, to analyze source code from mission-critical legacy systems. The goal is to establish an AI-driven modernization approach that helps to improve visibility into system design and supports safer migration.
Hitachi plans to develop solutions based on this approach to help support core system modernization. The company intends to roll out these solutions across multiple industries, beginning with financial institutions.
Hitachi also plans to access OpenAI’s AI models for cybersecurity through OpenAI’s Trusted Access for Cyber initiative. As part of OpenAI’s Japan Cyber Action Plan, the initiative is intended to provide advanced AI capabilities to trusted defenders and help strengthen cyber resilience in Japan’s critical sectors.
Under OpenAI’s defense-focused framework, Hitachi will explore the use of these models for legitimate defensive purposes, including vulnerability identification, prioritization, remediation, and validation. Hitachi reported that these activities will include appropriate safeguards, governance, and human oversight.
Hitachi’s Cyber CoE will act as “Customer Zero” by applying these capabilities internally to help validate Hitachi-provided systems. Insights from this work are expected to help strengthen Hitachi’s cybersecurity capabilities.
The companies’ expanded work follows a Memorandum of Understanding signed in October 2025. Since then, Hitachi and OpenAI have been exploring ways to use OpenAI’s AI technology to help enhance Hitachi’s Lumada solutions, including HMAX.
Hitachi reports that many organizations face challenges in advancing AI transformation because of reduced visibility into legacy systems, including systems affected by the retirement of experienced engineers. At the same time, the changing cybersecurity landscape is increasing the need for more advanced defensive capabilities.
Hitachi’s Modernization CoE will use the AI-driven modernization approach to develop solutions for “Modernization powered by Lumada.” These solutions are expected to support processes ranging from visualization of high-level specifications based on existing source code to migration testing for new systems.
The work will also support Hitachi’s Frontier AI Deployment Center, which focuses on real-world AI deployment. Hitachi reports that insights from the modernization and cybersecurity initiatives will be applied to HMAX, its next-generation AI solution suite for social infrastructure.
By combining OpenAI’s AI technology with Hitachi’s experience in mission-critical systems, the companies aim to help support more resilient systems and advance AI transformation in social infrastructure.
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