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SpaceXSI and the AI unit, by the numbers
Colossus, funding, and valuation.
1.7 GW
SpaceXSI compute power in gigawatts (GW), September 30, 2026, per SpaceX's quarterly results
780K
Graphics processing units (GPUs) across Colossus 1 and 2, September 2026
$250B
xAI's value when SpaceX acquired it, February 2, 2026
Compute
Funding before the merger
Everything on this page is free. Every figure traces to a source listed below. Values read from a company chart, or not reported directly, are marked as estimates.
Data sources (37)
- Index of official xAI announcements with dates for every model and product release used in the events list
- Series B funding round of $6 billion, May 26, 2024
- Series C funding round of $6 billion, Dec 23, 2024, plus Colossus details: 100,000 H100 GPUs, 122 day build, plan to double to 200,000
- Series E funding round of $20 billion, Jan 6, 2026, over 1 million H100 GPU equivalents at the end of 2025, approximately 600 million monthly active users across X and Grok apps, Grok 5 in training
- Colossus build timeline: 122 days to first power, doubled in 92 days, full scale at 200,000 GPUs in February 2025, roadmap to 1 million GPUs
- SpaceX acquired xAI, announced Feb 2, 2026
- Grok-1 announcement, Nov 3, 2023
- Open release of Grok-1 weights, Mar 17, 2024
- Grok-1.5 announcement, Mar 28, 2024
- Grok-1.5 Vision preview, Apr 12, 2024
- Grok-2 beta release, Aug 13, 2024
- Grok opened to everyone on X, Dec 12, 2024
- Grok 3 beta, Feb 19, 2025
- Grok 4 release, Jul 9, 2025
- Grok Code Fast 1 release, Aug 28, 2025
- Grok 4 Fast release, Sep 19, 2025
- Grok 4.1 release, Nov 17, 2025
- Grok 4.1 Fast release, Nov 19, 2025
- Grok Imagine 1.5 preview, Jun 3, 2026
- Elon Musk post, Sep 2, 2024: Colossus 100,000 H100 cluster online, built in 122 days
- Elon Musk post, Mar 28, 2025: xAI acquires X, combination values xAI at $80 billion and X at $33 billion
- Elon Musk post, Aug 22, 2025: MACROHARD announced as a purely AI software company
- Elon Musk post, Oct 12, 2025: MACROHARD scope statement
- Elon Musk post, Sep 17, 2025: Colossus II introduced as the first gigawatt AI training cluster
- Elon Musk post, Mar 11, 2026: MACROHARD or Digital Optimus described as a joint xAI and Tesla project
- Elon Musk post, Mar 14, 2026: TERAFAB project launch teaser
- Elon Musk post, Mar 21, 2026: formal TERAFAB announcement, joint SpaceX and Tesla project targeting over a terawatt of compute per year, about 80% for space and 20% for the ground
- xAI, Grok 4.6, August 12, 2026
- SpaceXSI, Grok Bot is now included with more plans, August 26, 2026
- Elon Musk post, Jan 17, 2026: Colossus 2 operational, called the first gigawatt training cluster, with an upgrade to 1.5 gigawatts stated for April (the June 2026 prospectus puts Colossus and Colossus II together at about 1.0 gigawatt)
- Elon Musk post, Jul 22, 2025: 230,000 GPUs including 30,000 GB200s training Grok at Colossus 1
- Elon Musk post, Sep 25, 2026: Colossus 1 is 150,000 H100, 50,000 H200, and 30,000 GB200; Colossus 2 is 110,000 GB200 and 440,000 GB300
- SpaceX SEC filings: Form S-1 (May 20, 2026); final prospectus (June 11, 2026) with Colossus cluster sizes, nameplate compute draw, xAI preferred stock by series, and the 0.1433 exchange ratio; Form 10-Q (Aug 4, 2026) with 1.4 gigawatts of nameplate compute draw at June 30, 2026
- SpaceX Q3 2026 earnings release (Form 8-K, Oct 20, 2026) with 1.7 gigawatts of nameplate compute at September 30, 2026
- Series B post-money valuation of $24 billion after Elon Musk's $18 billion pre-money statement
- Series C coverage: Kingdom Holding filing cites a $45 billion valuation
- SpaceX and xAI deal values xAI at $250 billion and SpaceX at $1 trillion
- September 2025 report of a $200 billion valuation, which Elon Musk called false the same day; excluded from the valuation chart
Related: SpaceXSI · All Explainers · State of Elon
