NTT Data nears a deal to build Anthropic's Osaka data center for up to 1 trillion yen

Start with the units, because the two sources use different ones. The Nikkei's 500 MW is power intake ^[3]; NTT's own target is IT power capacity, about 300 MW today and about 1 GW by fiscal 2033 ^[12]. Set one against the other anyway (the measures differ, so treat the ratios as rough) and the Osaka site comes to 50% of the 1 GW end point and 71% of the 700 MW NTT has to add ^[16][17]. Against OSK11, the 30 MW Kansai facility NTT opened in April 2026, it is 16.7 times the size ^[7][15].

We think the reading that matters is concentration. If the site counts toward the plan, one tenant would take most of the capacity NTT intends to add, and NTT would have less to offer the many colocation customers behind its position as Japan's leading provider ^[14]. That view fails in two ways: if the signed capacity comes in well under 500 MW, or if the site sits outside the 1 GW plan altogether.

The counter-thesis starts from the fact that both headline numbers are ceilings. Cryptobriefing calls the $6.3 billion a ceiling estimate and says the deal is not finalized ^[5]; the Nikkei says costs could reach 1 trillion yen ^[2]. Divide $6.3 billion by 500 MW and the ceilings imply $12.6 million per MW ^[11], a figure that moves if cost and capacity do not land at their limits together.

Neither source says whether the site counts toward NTT's 1 GW plan, who funds the construction, or on what lease terms. The answer decides whether the money is NTT's to spend or is recovered from Anthropic.

Timing is the other place this can go differently. Cryptobriefing lists the inputs that move a data center date: power availability, equipment supply and permitting ^[8]. A signature at the fiscal year-end ^[6] would leave all three less time to settle before any 2028 start ^[10].