Microsoft Files Patent for AI That Writes the Blueprint for Fake Test Data

By Patentlyze Team · Updated Nov 5, 2026

Microsoft's patent lets an AI write the rulebook for fake test data, then hands the heavy lifting to a plain program that can produce millions of rows. The AI does the thinking once, and the fast tool does the repetition.

See all 21 drawings from this filing ↓

What Microsoft's fake-data patent actually does

Every time a company wants to know whether its database can survive a busy day, someone has to fill it with a mountain of realistic-looking records. Using real customer files is a privacy risk, so teams invent fake ones, sometimes millions of rows' worth.

Microsoft's patent splits that job in two. First, an AI model is asked about a field such as healthcare, and it writes the ground rules: patient weights should land between these two numbers, check-out times must come after check-in times, and each visit gets a reason from this list. Then a plain program with no AI inside follows those rules and produces as many rows as you ask for, quickly.

Free-text columns, like a doctor's comments, get a similar shortcut. The AI writes a batch of sample sentences, and a small, simple model learns to produce endless variations of them.

How the AI hands rules to a plain data tool

The system starts with a prompt (a written instruction) that names a domain, such as healthcare or finance. The prompt can be built automatically from a schema file (a sheet of metadata listing column names and data types). A generative AI model, such as a large language model (the AI behind chatbots), replies with data parameters: boundaries or relationships for each column of a table. The filing gives three examples:

• Ranges: a minimum and maximum, such as patient weight, or a start and end date.
• Category lists: the allowed entries for a column, such as reasons for a visit.
• Dependent columns: pairs like a disease and a matching symptom, so one column constrains another.

The system transforms those parameters into an argument (a package of settings) and sends it, possibly through an API (a standard way for programs to talk to each other), to a scalable data generation tool. The claims say this tool is a non-AI tool, so it picks values inside the boundaries at high speed. The finished table can then feed a workload emulator, which runs a test and produces a performance benchmark.

The claims also cover checking the AI's parameters against a schema, regenerating ones that fail, and prompting the AI several times to refine its answers. For sentences, the AI writes training examples and a lightweight model learns from them. The description names a Markov chain (a model that guesses each next word from the current one) as an example.

Why privacy-safe test data matters to Microsoft

If you have ever wondered how a company tests a system against millions of records without peeking at real people's information, this is the problem. Making all that fake data with an AI model alone takes a long time and a lot of computing power. Writing the settings for a simple generator by hand is slow too, and a new kind of workload means writing them all over again.

Here the AI does the thinking once, in a few short answers, and the fast tool does the grunt work. You would never see this directly, but it points to quicker testing of the databases and business software that handle your records, built without those records anywhere near the test.

Microsoft's 29th filing we've tracked in AI training and infrastructure since May follows earlier applications like one on numeric AI communication and one on conditional cloud logging.

The drawings

21 drawing sheets from US 2026/0349901 A1 · click any drawing to enlarge

Show the other 13 sheets

Browse all the drawings 21 drawing sheets

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