BRAIAINThe Buildout Index for AI — quarterly readoutData through Q2/Q3 2026 · published Oct 20, 2026 · braiain.com

The AI buildout, in one page

647.7
BRAIAIN Buildout Index, Q1 2022 = 100 — a combined, overlapping measure (big-4 capex + NVIDIA data-center revenue), 6.5x since Q1 2022. The clean headline: Microsoft, Alphabet, Amazon and Meta alone spent $513.8B in the year to June 2026 — about $16,282 every second.
100 97.7 647.7 2022 2023 2024 2025 2026

Index by calendar quarter, Q1 2022 = 100, scale 0–648, from SEC-filed figures. Full method: braiain.com/buildout-index.html

Capital

$513.8B big-4 capex, yr to Jun 2026 (AMZN 173.0 / GOOGL 132.4 / MSFT 115.9 / META 92.4 — filings)
64% of global VC went to AI in Q3 2026 ($102B of $159B, Crunchbase)
$500B Stargate commitment over 4 years (announced Jan 2025; not spend to date)

Compute

$277.7B NVIDIA data-center revenue, yr to Jul 2026 ($3.8B/qtr in 2022 → $89.0B)
$3.50/hr median H100 rent, +17% in a year (Oct 2026) (while chip perf/$ improves ~49%/yr — Epoch, Feb 2026)
3.17M models on Hugging Face (live, Oct 20), doubling every 8.1 months on average since 2022 (archived series, R²=0.957; recent pace slower)
$50 / $10 flagship vs mid-tier token prices per 1M output (OpenAI $30→$50; Anthropic $75→$50; mid tier collapsed — Oct 2026 list)

Power & land

$28.92 → $269.92 PJM capacity price, one auction cycle (9.3x); now $325 (three straight auctions at the cap; short 6,623 / 6,831 MW)
+29% US industrial electricity since 2020 (nominal, EIA; flat the decade before)
7,754 MW hyperscaler nuclear announced (6 deals; none since Jan 2026; first restart 2027)
7,481 MW under construction, 1.4% vacant, 80.4% preleased (CBRE NA primary markets, H1 2026)
233+ GW in the Texas large-load queue, >70% data centers (requests, not committed load — ERCOT, year-end 2025)

Society

1.2B+ weekly ChatGPT users (OpenAI, Sep 2026; 100M in Nov 2023)
120,136 US job cuts citing AI, Jan–Sep 2026 (2.2x all of 2025 — employer-attributed, Challenger)
51% of web traffic was bots in 2024 (Imperva-protected sites)

Research

5x/yr frontier training compute growth (Epoch AI, Feb 2026)
6.8 mo doubling of the world's AI chip stock (Epoch AI, Feb 2026)
45,102 arXiv AI listings in 2025, 6x 2020 (CC0 metadata)

Scale check

30 months for a grid transformer; compute doubles in ~7 (Wood Mackenzie via POWER; Epoch)
1,818 US data centers mapped; 3,000+ counted (OpenStreetMap floor; Data Center Map via Pew)
~9% of DC-metro Potomac-basin consumptive water use (ICPRB, Mar 2026)

The Reckoning scorecard — our editorial estimate: 2031 (range 2028–2033) — 6 of 10 conditions met

  1. ■Machines outnumber humans on the web — met 2024
  2. ■Grid auction clears short of requirement — met Dec 2025
  3. ■A billion weekly users of one AI — met ~May 2026 (interpolated)
  4. ■Big-4 spend passes $500B/yr — met 2026
  5. ■AI takes the majority of VC — met Q3 2026
  6. ■100k+ yearly job cuts citing AI — met 2026
  7. □First reactor restarted for a tech buyer — targeted 2027
  8. □Data centers at 10% of US power — 2028 (LBNL high case) to ~2033 (our extrapolation)
  9. □10 GW hyperscaler nuclear announced — extrapolated ~2027
  10. □A lab reports crossing its autonomy threshold — extrapolated ~2028

Every figure above is from the public source named beside it, as of the dates shown; full sources, formulas and downloads at braiain.com/methodology.html. The Reckoning is an editorial estimate, published math, no one's forecast but ours. Cite as: BRAIAIN Readout, Q3 2026, braiain.com/report.html. © 2026 BRAIAIN, a dnilgis project. Not affiliated with any company named.