The Nuro, as the service is called, is available to homes and small businesses in Tokyo and six surrounding prefectures, Computerworld reports.

The upload speed is a little slower than download at 1 Gbps, but it's still faster than most of us get anywhere else in the world.

By comparison, the ultra-fast Google Fibre broadband internet service offers a "mere" 1 Gbps download speed – which is still some 100 times faster than today's average home internet connection – in Austin, Texas and Kansas City, Missouri in the US.

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Nuro costs 4980 Yen ($A50) on a two-year contract, plus a 52,500 ($524) installation fee.