# Amazon's Project Rainier scales toward 5GW Anthropic compute on Trainium
> Indiana's $11bn AWS megacampus runs ~500,000 Trainium2 chips for Anthropic; the partners now target up to 5GW, with Amazon guiding to ~$200bn capex in 2026

**Meta:** type: story · date: 2025-10-29 · heads: किसका पैसा, लंबी पारी · 8 takes · 3 lenses · 3 regions

## Summary

[Amazon](/hi/entity/amazon)'s Project Rainier in New Carlisle, Indiana, an $11bn AWS megacampus, the
largest capital investment in state history, runs nearly 500,000 [Trainium2](/hi/entity/amazon)
chips training [Anthropic](/hi/entity/anthropic)'s models. The partners have since signed for up to 5GW of new
compute, with ~1GW of Trainium2/Trainium3 capacity targeted by end-2026; Trainium3 was
co-developed with [Anthropic](/hi/entity/anthropic). The full site is set to span ~30 buildings and draw
>2.2GW of [Electricity](/hi/entity/electricity). Amazon is guiding to ~$200bn of 2026
[capex](/hi/n/hyperscaler-capex-725bn-2026), the largest of the four hyperscalers. Custom
silicon is Amazon's lever to dilute [Nvidia](/hi/entity/nvidia) dependence while serving one frontier
customer at industrial scale; power, not chips, is the named bottleneck.

## By the numbers

- $11bn, Project Rainier investment (largest in Indiana history).
- ~500,000, Trainium2 chips in the activated cluster.
- Up to 5GW, Amazon–Anthropic compute agreement; ~1GW Trainium by end-2026.
- ~30 buildings, >2.2GW, eventual campus footprint and power draw.
- ~$200bn, Amazon's 2026 capex guidance.

## Why it matters

Rainier is the clearest case of a hyperscaler building a dedicated, custom-silicon city for
a single AI lab, vertical integration that, if it works, reroutes hundreds of billions
away from Nvidia and ties Anthropic's roadmap to Amazon's grid and balance sheet.

## What to watch

- Trainium3 ramp and whether the 5GW agreement converts to sited, powered capacity.
- Indiana/Ohio power sourcing (gas-plant acquisition) and local pushback.
- Whether custom silicon dents Nvidia's data-center share.

## Regional takes (batched by bias / lens)

### unlabelled
- **Anthropic** (United States, en) — Anthropic's own statement on expanding the Amazon collaboration to up to 5 gigawatts of new compute, with ~1GW of Trainium2/Trainium3 capacity targeted by end-2026, the record from the customer side.
  Source: https://www.anthropic.com/news/anthropic-amazon-compute
- **Data Center Knowledge** (United States, en) — 
  Source: https://www.datacenterknowledge.com/supercomputers/project-rainer-aws-anthropic-complete-massive-ai-supercomputing-cluster
- **Datacenter.news** (Global, en) — 
  Source: https://datacenter.news/story/aws-s-11bn-indiana-data-centre-powers-anthropic-s-ai-growth
- **Data Centre Magazine** (United Kingdom, en) — 
  Source: https://datacentremagazine.com/news/aws-how-500-000-trainium2-chips-power-project-rainier
- **WhatJobs** (United States, en) — 
  Source: https://www.whatjobs.com/news/inside-amazons-indiana-ai-megaproject-a-million-trainium-chips-anthropics-bet-and-the-power-problem/
- **Reuters** (Global, en) — 
  Source: https://www.reuters.com/technology/

### US business
- **CNBC** (United States, en) — Reports the $11bn Indiana campus opening and its role powering Anthropic, framing Trainium as Amazon's bid to cut dependence on Nvidia while feeding a single frontier customer at scale.
  > "Amazon opens its $11 billion Project Rainier AI data center in Indiana, powering Anthropic."
  Source: https://www.cnbc.com/2025/10/29/amazon-opens-11-billion-ai-data-center-project-rainier-in-indiana.html

### data-center engineering
- **DataCenterDynamics** (United Kingdom, en) — Trade press on the activated cluster of nearly 500,000 Trainium2 chips and the campus's eventual ~2.2GW draw across ~30 buildings, the physical scale behind the headline dollar figure.
  > "AWS activates a Project Rainier cluster of nearly 500,000 Trainium2 chips."
  Source: https://www.datacenterdynamics.com/en/news/aws-activates-project-rainier-cluster-of-nearly-500000-trainium2-chips/

## Across the graph
- Related: [[hyperscaler-capex-725bn-2026]], [[nvidia-amd-openai-6gw-mi450]], [[microsoft-fairwater-superfactory-2026]]
- Entities: Hyperscaler Capex, Amazon, Anthropic, Data Centers, United States

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