Where 17 AI answers would put a food factory in Japan, and the subsidy rules behind them

In October we asked 12 AI models where a food manufacturer should set up a company in Japan, with government subsidies in mind. They gave 17 answers between them. As a ranking, the answers are weak. They agree on one prefecture, and the other four places change from model to model and from run to run.

The answers are more useful for what they repeat about subsidies. Three rules appear in many of them, and the prefecture and city pages they cite confirm all three. Those rules shape where and when you can claim support, whichever prefecture you choose.

Hokkaido is the only consensus

All 17 answers named Hokkaido. After that, the answers spread across 27 prefectures, and 11 of those were named by one answer only. A place that only one model suggests is a lead to check, not a recommendation.

Ask again and the list changes

Four models answered the same question twice, with the same setting. Each kept only 1 to 3 of its 5 places. The places that change between runs are the ones the model is least sure of. One answer, Haiku 5.5 Medium, named three places and declined to name a fifth it had not checked.

Three rules the pages confirm

1. The subsidy follows the factory, not the registered address

Registering a company in a prefecture does not qualify it for that prefecture's factory subsidy. The programs pay for buildings, equipment, and new hires at a site. Saitama, for example, sets a minimum of 1,000 m² of land and 500 m² of building, plus new employees. Saitama Prefecture

2. You file before you buy or build

Shizuoka requires a start notice before land acquisition or the start of the project, whichever comes first. Shizuoka Prefecture Kitakyushu requires the business plan before the project starts. Kitakyushu City Hokkaido requires location plan certification between 90 days before construction and the day it starts. Hokkaido FY2026 listing Sign a land or lease contract first, and you can lose the subsidy.

3. Large grants come with long commitments

Hokkaido may pay its subsidy in instalments over as many as ten years, and requires the plant to operate for more than ten years after the grant decision. Hokkaido manual Sapporo requires the company or its parent to have operated for a year, and the facility to keep running for ten fiscal years. Sapporo City A headline cap is a maximum. The amount you receive, and when, depends on the award.

Before you shortlist a place

• Ask the prefecture and the city for a written estimate based on your own budget, headcount, and opening date.
• Open the official page for every figure an AI gives you. In our check, most misses were a single cap, rate, or date.
• Check the application window on the page itself. Several rounds the answers cited had already closed.
• Confirm whether a newly registered company qualifies, or whether the program needs years of operation or group sales.

To choose which AI model to use for this kind of research, see the model comparison. It measures how far each model searched and how many of its cited pages back what it wrote.