Rocket® COBOL® Fuel: About COBOL, GenAI, and the market [February 2026]

Hi everyone, 

Welcome to our monthly Rocket COBOL newsletter. This edition tackles the biggest question of the month (or maybe even the year): How is GenAI changing COBOL modernization?

Code Translations vs. Modernization:
What’s the difference

This week, COBOL made headlines again as the debate around AI‑generated COBOL resurfaced. The market reaction and the conversations online point to one thing: change is no longer coming. It’s here.

Though after more than 5,000 successful COBOL modernization projects, we’ve learned one lesson that matters now more than ever:

Code Translation Is Useful. But Language Isn’t the Problem

Many AI companies promise rapid “COBOL modernization,” but what they’re really talking about is syntax translation. And while COBOL is a straightforward language (ask any COBOL developer you know), and AI can certainly help accelerate development tasks, translating COBOL syntax is only a small fraction of the modernization journey.

The real challenge? Understanding and navigating massive, often decades‑old codebases packed with business logic, interdependencies, and mission‑critical processes. These systems often span millions of lines of code. With documentation gaps and retiring specialists, these valuable assets are becoming black boxes. 

Mission critical applications also contain nonfunctional requirements, business processes, data semantics, operational runbooks, dependencies, call chains, data lineage, copybooks, architecture context, and more. 

Attempting to change (or convert) an application of that scale using only AI and risking even the smallest hallucination can lead to core business disruption.  

What “Modernized COBOL” Actually Means

When we talk about modernizing COBOL applications, we’re not talking about changing the business core. We’re talking about enabling the application to look, behave, and operate like any modern enterprise system.

A modernized COBOL application:

• Runs on today’s platforms: Windows, Linux, cloud, containers, ARM
• Integrates seamlessly with Java, .NET, REST APIs, CI/CD pipelines
• Supports modern UIs and services
• Boosts developer productivity through GenAI (including Copilot or Claude) and industry-standard dev tools like VS Code

In other words, the business logic that has been powering your organization for decades stays solid and the environment, tooling, and operational model become fully modern.

Where AI drives value for enterprises today

AI is already transforming how enterprises approach modernization, and it’s crucial to understand its current limits. We see customers using GenAI in Rocket COBOL products or tooling them together with external AI services to accelerate insight, documentation, and change management.

• Application understanding: Code maps, call trees, data flows, and documentation generation. 

• Onboarding & skills amplification: Copilot-style Q&A, code explanations, coding assistance. 

• Quality & safety: Test scaffolding, regression test generation, change impact analysis, code hygiene. 

• Developer velocity: Assisted refactoring, code understanding and coding assistance. 

Last year, we introduced GenAI Insights as a part of Rocket Visual COBOL 11.0. With GenAI insights, developers with any background can navigate COBOL applications of any size: generate human-language summaries for COBOL programs, get instant code explanation, find duplicated/dead code in seconds, and more.  

Industry analysts support this and echo each other highlighting that GenAI delivers the greatest value when it augments engineers, not replaces them.  

Rocket’s approach to LLMs
Deterministic + AI = Safe Modernization at Scale

At Rocket, we understand that every modernization journey is unique and take deterministic approach when it comes to GenAI features.  We do not send full mission‑critical applications into an LLM. Instead, we blend:

• GenAI
• Static code analysis
• Product documentation
• Custom prompts
• 50+ years of COBOL expertise

This results in the GenAI outputs rooted in our customers’ business context and eliminated the risks of hallucinations leveraging things AI does best. 

What’s next?

Explore how GenAI is transforming COBOL modernization on our blog: The Role of Generative AI in COBOL Modernization | Rocket Software.

If you have any questions about the role of AI in COBOL modernization or want to learn more on how to pair Rocket COBOL products with external AI tools, let us know in the comments.