xAI
Understand the true nature of the universe through maximally truth-seeking AI
PRIVATEBurlingame, CA~1,200Founded 2023~$45B+ equity (now part of SpaceX) raised$250B (within SpaceX combination) valuationx.ai
SectorsAI Software
Market Metrics
Valuation (Feb 2026, in SpaceX)
$250B
Series E $230B (Jan 2026); $1.25T combined with SpaceX
Colossus GPU Capacity
~1M H100-equiv
Colossus I + II by end-2025; up from 200K
Revenue Run-Rate (end-2025)
~$3.8B (xAI + X)
xAI standalone ~$500M; per Sacra
SpaceX + xAI Combined Valuation
$1.25T
Largest private merger on record (Feb 2026)
Updated at 2026-Q1
Funding History
Total raised: ~$45B+ equity (now part of SpaceX) · Latest valuation: $250B (within SpaceX combination)
| Round | Date | Amount | Valuation | Key Investors |
|---|---|---|---|---|
| Series A | Dec 2023 | $135M | - | Insider investors (Musk-aligned) |
| Series B | May 2024 | $6B | $24B | Valor Equity PartnersVy CapitalAndreessen HorowitzSequoia+2 more |
| Series C | Dec 2024 | $6B | $50B | Andreessen HorowitzSequoiaValorBlackRock+5 more |
| X-Combination | Mar 2025 | $33B (all-stock acquisition of X Corp) | $80B (combined entity) | xAI acquires X Corp; combined valuation per Reuters |
| Equity + Debt | Jul 2025 | $10B ($5B debt + $5B equity) | - | Morgan Stanley (debt syndicate)existing equity investors |
| Series E | Jan 2026 | $20B | $230B | Existing strategic and sovereign investors (upsized from $15B target) |
| SpaceX Combination | Feb 2026 | All-stock (share exchange) | $250B (xAI), $1.25T combined | Combined with SpaceX; 1 xAI share = 0.1433 SpaceX share |
Updated at 2026-Q1
Product Specifications
| Product | Type | Status |
|---|---|---|
| Grok 4 | Frontier reasoning model | GA (Jul 2025) |
| Grok 3 | Production model with Big Brain reasoning mode | GA |
| Grok-1 | Open-source 314B MoE base model | Released (Mar 2024, Apache 2.0) |
| Grok (consumer) | Chat app integrated into X (formerly Twitter) | GA on X Premium / Premium+ and standalone iOS/Android apps |
| Aurora | Native image generation in Grok 2 and later | GA |
| xAI API | Developer platform with OpenAI-compatible endpoints | GA |
| Colossus | GPU supercluster (Memphis) | Operational; ~1M H100-equivalent across Colossus I and II (end-2025) |
| Colossus 2 | 1M+ GPU expansion campus (Memphis-area) | Scaling; first racks live Sep 2025 |
Updated at 2026-Q1
Partnerships & Investors
SpaceXParent / Combined Entity
SpaceX combined with xAI in Feb 2026 at a $1.25T combined valuation (xAI $250B); structured as a share exchange ahead of a planned SpaceX IPO.
X (formerly Twitter)Wholly Owned
Acquired Mar 2025 in $33B all-stock deal; provides distribution, RLHF data, and consumer surface area.
NVIDIAStrategic / Supplier
Primary GPU supplier (H100, H200, GB200, GB300); Colossus + Colossus 2 buildouts.
Dell + SupermicroStrategic / Server OEM
Server rack supply for Colossus and Colossus 2 builds.
OracleCloud
OCI capacity for training overflow; smaller share than Microsoft / AWS arrangements at OpenAI / Anthropic.
TeslaStrategic (sister company)
Loose technical exchange around Dojo and autonomy; both Musk-controlled.
Saudi PIF / Kingdom HoldingInvestor
Sovereign equity participant in Series B, Series C, and follow-on rounds.
MGX (UAE)Investor
Strategic sovereign-fund participant in Series C and subsequent rounds.
Updated at 2026-Q1
Key Milestones
Jul 2023
Company Founded
Elon Musk forms xAI in Nevada; team includes ex-DeepMind, OpenAI, Google researchers
Nov 2023
Grok-1 Launch
First model rolled to X Premium+ subscribers; weights open-sourced March 2024
Mar 2024
Grok-1 Open-Sourced
314B parameter MoE released under Apache 2.0
May 2024
Series B at $24B
$6B raise positions xAI as a top-3 valued AI startup at the time
Aug 2024
Grok-2 (Consumer)
Grok-2 and Grok-2 mini released to X Premium
Sep 2024
Colossus Online
100,000 H100 GPU supercluster live in Memphis 122 days after first rack install
Dec 2024
Series C at $50B
Colossus scales to 200,000 GPUs; planned 1M GPU expansion announced
Feb 2025
Grok 3
Reasoning model + Big Brain mode; built on 200K H100 cluster
Mar 2025
xAI Acquires X Corp
All-stock combination valued at $80B combined ($33B equity for X minus $12B debt)
Jul 2025
Grok 4
Frontier-tier reasoning model; tops several benchmarks at launch
Sep 2025
Colossus 2
1M+ GPU expansion site near Memphis announced; first racks live
Jan 2026
Series E at $230B
$20B round (upsized from a $15B target), roughly quadrupling the $50B Dec 2024 valuation
Feb 2026
SpaceX Combination
SpaceX combines with xAI at a $1.25T combined valuation (xAI $250B); rationale centers on orbital data centers and vertical integration
Updated at 2026-Q1