富士通、生成AI活用したモダナイゼーションサービス開始—移行期間4割短縮

Fujitsu announced its new AI-driven Modernization Service, effective July 14, 2026, designed to accelerate legacy system updates by fusing generative AI with decades of systems integration expertise. The service combines Fujitsu's proprietary AI platform Kozuchi and large language model Takane (co-developed with Cohere) with cutting-edge models from Anthropic (Claude) and OpenAI (GPT), overseen by Fujitsu's modernization specialists—engineers termed "modernization masters" who possess deep legacy technology knowledge.

The core innovation lies in AI-driven automation tailored to modernization workflows. Rather than simple mechanical code translation, the service deploys custom AI agents that orchestrate complex transformation tasks in parallel, unifying decision criteria across project phases to eliminate rework and quality variance. The system analyzes legacy assets holistically, structuring them as AI-ready data, then automates language conversion, testing, and validation through what Fujitsu calls "harness engineering" and "loop engineering"—continuous refinement of transformation results. Critically, the service maintains existing system value and allows future extensibility while migrating code to maintainable, object-oriented Java applications. A human-in-the-loop mechanism ensures final judgment and quality consistency, balancing automation with risk control. The result: modernization timelines can shrink by approximately 40%.

The multi-AI architecture reflects customer diversity. Fujitsu allows flexible pairing of multiple AI models matched to each customer's business domain, program characteristics, and security requirements, freeing customers from the operational burden of tracking AI evolution and letting them focus on business transformation and ROI. The service draws on Fujitsu's accumulated knowledge base—thousands of project records, case studies, successes, and failures—which has been codified and fed to specialized AI agents, ensuring high reproducibility and reliability regardless of engineer availability or location.

This service is the second pillar of Fujitsu's AI-driven modernization platform. The first, Fujitsu Application Transform (powered by Kozuchi), launched in March 2026 and automatically generates design documents from source code analysis. Fujitsu plans to progressively offer customers AI service platforms to execute modernization independently, leveraging lessons learned from the managed service.

Fujitsu's move reflects a broader industry shift toward automating legacy system transformation as enterprises accelerate both digital transformation (DX) and AI transformation (AX) initiatives. The company is addressing a real bottleneck: modernizing complex systems where decades of business logic and regulatory compliance (particularly acute in finance, public administration, and healthcare) are embedded in aging code. By codifying its own institutional knowledge—thousands of project cases, successes, and failures—into a specialized AI agent, Fujitsu is attempting to scale expertise that typically depends on scarce senior engineers.

The multi-AI approach is strategic. Rather than betting on a single model, the service lets customers mix Fujitsu's proprietary tools (Kozuchi, Takane, developed with Cohere) with best-in-class external models from Anthropic and OpenAI based on workload requirements and security posture. This flexibility matters because legacy modernization involves both semantic understanding (where large language models excel) and domain-specific task orchestration (where specialized agents add value). The 40% timeline reduction is backed by concrete mechanisms: AI-driven cross-asset analysis, automated code transformation with continuous validation, and human-in-the-loop oversight to catch risks and ensure quality consistency.

The service sits within a broader Fujitsu roadmap: an earlier design-document auto-generation service (Fujitsu Application Transform, launched March 2026) handled upstream asset analysis, and this new offering targets the core modernization work itself. Fujitsu signals that customer self-service AI tools will follow, gradually shifting from managed service to platform.

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