Supercomputers/Systems/SoftBank Tomakomai AI Data Center
Japan · under construction · ai training
SoftBank Tomakomai AI Data Center
Also known as Hokkaido Tomakomai AI Data Center
Operated by SoftBank Corp. at Tomakomai Data Center Campus .
Phase 1 seed dataset, compiled by hand. These rows were built from public operator, laboratory and vendor sources. A mechanical second-reader pass has since fetched every cited source: 1092 of 1153 systems have a readable citation that names them, and 40 are genuinely weakly sourced. Every claim carries its source and a confidence tier. Treat anything below verified as a lead, not a citation.
Measured performance
- Rmax
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- Rpeak
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- Rmax ÷ Rpeak
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- Cores
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- Power
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- Per watt
- - GF/W
Figures are as last publicly reported for the configuration described below, not a live measurement. Where a system was upgraded in place, the post-upgrade configuration is shown and the earlier one appears in the timeline.
What this machine is made of
One row per supplier relationship. “Supplier at build” is the company that shipped the part at the time; where that company has since been acquired, the parent it rolls up to today is shown beside it. That distinction is what makes ticker-level aggregation possible across a thirty-year dataset.
| Role | Part | Supplier at build | Quantity | Confidence | Source |
|---|---|---|---|---|---|
| Integrator | - SoftBank Corp. builds and will operate the Hokkaido Tomakomai AI Data Center | SoftBank Corp. | - | Reported | softbank.jpsoftbank.jp |
AI datacenter metrics
Figures beyond an accelerator count, each with who stated it. What can and cannot be compared across AI datacenters.
| Metric | Value | As of | Basis | Note | Source |
|---|---|---|---|---|---|
| Facility power | 300 MW | 2025-05 | Design target | SoftBank says power capacity expected to exceed 300 MW (value is the floor); site 700,000 sq m, ops expected FY2026. Campus-level figure. | softbank.jp |
The read
SoftBank Corp.'s Hokkaido Tomakomai AI Data Center, part of its Brain DataCenter initiative to move data processing out of the Tokyo and Osaka areas. SoftBank says it will exceed 300 MW on a 700,000 square metre site run on locally procured renewable energy; the groundbreaking was held on 15 April 2025 and operations are scheduled to begin in fiscal 2026 (year ending 31 March 2027). A SoftBank News feature of 25 February 2026 put the project at roughly 60 to 70 percent complete including design and administrative steps. Tech Capital also reports 300 MW. SoftBank's May 2026 GB200 NVL72 GPU cloud does not name this site, so no GPU edge is recorded.
Timeline
- 2025-04-15 Announced source
Site & facility
Change history
- 2026-10-02 Added SoftBank Tomakomai AI Data Center, Japan's 300 MW-plus Hokkaido build
Source check
We fetched this system's own citations and recorded whether each page actually mentions it. This is a corroboration signal, not a fact check, and it is published so you can see how well the sourcing holds up rather than take it on trust.
| Cited source | Result | Found on the page |
|---|---|---|
| softbank.jp | names system only | - |
| softbank.jp | names system only | - |
Checked 2026-10-09 by pnpm verify. Re-run it and the table changes with the web.