# R4 | x-ai/grok-4.3 | run 1

## Prompt

As of the most recent available estimate, what is the population of Japan, and is it increasing or decreasing? Give the figure and year, and cite sources.

## Response

Japan's population stood at **123,049,524** as of October 1, 2025, according to the preliminary results of the national census.[[1]](https://www.nippon.com/en/japan-data/h02799/)

It is decreasing, with the figure down more than 3 million from 126.1 million in 2020—the largest five-year drop on record.[[2]](https://www.nytimes.com/interactive/2026/05/29/world/asia/japan-census-population-decline.html)

Mid-2026 estimates from sources such as Worldometers project further decline to around 122.4 million.[[3]](https://www.worldometers.info/world-population/japan-population/)

**How has Japan's population changed in the most recent monthly or quarterly data?**
