AI for AS/400 Software: No Rewrite Required

Ask the system a question instead of running a report

A business owner opens a chat window and types: "Why are the shipments to the Midwest warehouse running two days late?" Ten seconds later they have an answer, pulled straight out of Db2 for i, with no report request filed, no query written, and not one line of RPG touched. That is the real starting point for AI on AS/400, and it is the one that actually changes how a shop runs day to day.

Watsonx assistants can sit on top of your existing IBM i applications and give people a conversational way in. "Show me open invoices over $50,000." "Summarize last week's order failures." "Which customers are past due and still have open orders." The assistant retrieves and summarizes data from Db2 for i, and it can reach into Oracle, SAP, and flat-file operational systems at the same time, so a manager gets one answer instead of three logins. None of that requires rewriting the application underneath it. It requires connecting to it.

Your ERP gets smarter without changing what it is

If you are running SAP S/4HANA, JD Edwards, or a homegrown IBM i ERP that has been tuned for twenty years, the instinct is to assume AI means ripping that out and starting over. It does not. Watsonx can sit alongside the ERP you already trust and take on the analysis work that used to eat a controller's or a planner's whole afternoon: predicting where inventory is going to fall short, flagging procurement decisions worth automating, generating operational summaries for people who do not want to open the ERP screens themselves, catching transaction anomalies before they become a write-off, and tightening forecasting accuracy using patterns the ERP was never built to surface on its own.

The ERP stays the system of record. Nothing about how orders post, how inventory moves, or how the general ledger balances changes. AI is reading the exhaust from those processes and turning it into decisions a person can act on faster.

How the pieces actually connect

Here is the mechanism, in plain terms. IBM Power Virtual Server hosts IBM i workloads in the cloud, and watsonx connects to them through APIs, secure data pipelines, Db2 connectors, and event streams. Your AS/400 software, the RPG programs, the COBOL routines, the Db2 tables, all of it, stays exactly where it is and keeps running exactly as it always has. Watsonx reads the data, summarizes it, and in some workflows acts on it, but it does not rewrite a single object on your system.

That distinction matters more than it sounds like it should. A lot of the anxiety around AI and legacy systems comes from conflating "AI integration" with "application replacement." They are not the same project, and for most IBM i shops they are not even the same decade.

What you keep, and what you gain

What you keep is everything: the RPG and COBOL code your business logic actually lives in, the decades of edge cases already handled in that code, and the stability of a system that does not need a six-figure rewrite budget or a downtime window to justify itself. What you add is incremental, on your schedule, and reversible if a particular AI workflow does not earn its keep.

The architecture that makes this work is hybrid by design. Core transactional workloads, the stuff that has to be fast, auditable, and always on, stay on-premises on IBM i exactly where they have always run. AI models run in IBM Cloud, and data moves between the two environments through connections built for that purpose, not through some brittle export-and-reload process somebody has to babysit.

Governance keeps this safe for regulated shops

For shops in banking, healthcare, insurance, or anything else with a regulator looking over their shoulder, the next question is always governance. Watsonx.governance is built for exactly that: monitoring what the AI is doing, keeping an audit trail of what it read and what it recommended, and giving compliance teams something concrete to point to instead of a black box. AI touching financial or patient data without that layer is a real risk. AI touching that same data with governance in place is a controlled, documented process, no different in principle from any other system your auditors already sign off on.

Why this matters right now

The question every AS/400 shop is actually asking in 2026 is not "should we adopt AI," it is "how do we adopt it without throwing out software that already works." The answer holds up: you do not have to throw it out. AI reads your data, talks to your users, and sharpens your workflows, and your RPG programs keep doing exactly what they have always done, unbothered, in the background. That is not a compromise. For a shop with decades of business logic already proven out, it is the only version of AI adoption that actually makes sense.

Where to look next on AS400Software.com

If you are ready to move past the concept and into planning, these are good next stops. The first two are vendor discovery profiles for partner types that specialize in exactly this kind of work, and the third is a directory category covering the RPG-adjacent tools that make API and AI connectivity possible in the first place.

• AI for IBM i Preferred Partners ... Partner types that help IBM i teams evaluate safe, bounded AI use cases and connect tools like watsonx without disrupting production systems.
• Modernization Preferred Partners ... Partner types that help IBM i buyers phase API, integration, and AI-adjacent modernization work without a full rewrite.
• RPG and Web Development Tools ... The software category covering RPG extension, web-enablement, and application-integration tools that typically sit underneath an AI or API layer.

Common questions about this AI for IBM i topic.

Can AI work with AS/400 software without rewriting it?

Yes. Watsonx and similar AI platforms connect to IBM i applications through APIs, Db2 connectors, and secure data pipelines rather than modifying the underlying code. Your RPG and COBOL programs keep running unchanged while AI reads, summarizes, and helps act on the data those programs already produce.

Does IBM i support AI integration?

Yes. IBM Power Virtual Server can host IBM i workloads in the cloud, and watsonx connects to them for natural language queries, ERP enhancement, and predictive analysis. The integration happens at the data and API layer, so existing Db2 for i databases, flat-file systems, and custom applications stay intact.