Scale AI vs xAI: Founders, CEOs and History
Scale AI was founded in 2016 by Alexandr Wang, Lucy Guo and is led by Francis deSouza. xAI was founded in 2023 by Elon Musk and is led by Elon Musk.
Company facts
Founders
Scale AI
Alexandr Wang
Alexandr Wang co-founded Scale AI in 2016 and was its CEO until June 2025. He led the move from self-driving data into language-model training data and U.S. defense work, and Forbes named him the youngest self-made billionaire in 2022.
Lucy Guo
Lucy Guo co-founded Scale AI with Alexandr Wang in 2016 and led early product and design work. She left in 2018 and later founded the venture firm Backend Capital and the creator platform Passes. Lucy Guo was born in 1994. Guo left Scale AI in 2018.
xAI
Elon Musk
Elon Musk founded xAI in March 2023 to develop advanced artificial intelligence systems focused on scientific discovery and understanding the universe. Musk previously co-founded OpenAI in 2015 before departing over governance and strategic divergences.
CEOs and their tenures
Scale AI
- Alexandr Wang2016–2025
Co-Founder, former CEO and Chairman
Co-founded Scale and ran it until June 2025, when he joined Meta; remains chairman of the board.
Source - Jason Droege2025–2026
Interim Chief Executive Officer
Former chief strategy officer and Uber Eats founder who led Scale through the post-Meta-deal restructuring.
Source - Francis deSouza2026–present
Chief Executive Officer
Former Illumina CEO and Google Cloud COO, appointed CEO effective August 10, 2026 to grow the applications business.
Source
xAI
- Elon Musk
Executive leadership, strategic direction, and infrastructure architecture.
- Igor Babuschkin
Directs foundational model research, training loss optimization, and neural architecture.
Timeline: Scale AI and xAI side by side
2016Scale AI
Scale AI founded
Alexandr Wang and Lucy Guo founded Scale in Y Combinator's S16 batch.
2018Scale AI
Lucy Guo departs
Co-founder Lucy Guo left the company.
2019Scale AI
Series C and unicorn status
Founders Fund led a $100 million round valuing Scale above $1 billion.
2021Scale AI
Series E at $7.3 billion
Scale raised $325 million at a $7.3 billion valuation.
2023xAI
Incorporation of xAI in Nevada
Elon Musk files incorporation documents for X.AI Corp. in Nevada on March 9, 2023.
2023xAI
Official Public Launch and Mission Statement
xAI announces its team and mission on July 12, 2023: 'to understand the true nature of the universe'.
2023xAI
Release of Grok-1
xAI debuts its first conversational AI assistant, Grok-1, trained on an automated cluster of thousands of GPUs.
2024Scale AI
Series F at $13.8 billion
Accel led a $1 billion round with Nvidia, Amazon and Meta participating.
2024xAI
Open-Sourcing of Grok-1 Base Weights
xAI releases the base code and network architecture of its 314-billion-parameter Grok-1 model under the Apache 2.0 license.
2024xAI
$6 Billion Series B Funding Round
xAI secures $6 billion in Series B funding from Valor Equity Partners, Vy Capital, Andreessen Horowitz, and Sequoia Capital at a $24B post-money valuation.
2024xAI
Colossus Supercomputer Online in Memphis
xAI brings online the 100,000-GPU Colossus cluster in Memphis, Tennessee, constructed in just 122 days.
2024xAI
Commercial Launch of Grok-2 and Grok-Vision
xAI releases Grok-2, outperforming prominent frontier models in reasoning benchmarks, alongside enterprise developer APIs.
2025Scale AI
Meta invests $14.3 billion
Meta took 49% at a valuation above $29 billion; Wang joined Meta and Jason Droege became interim CEO.
2025Scale AI
Layoffs
Scale cut 200 full-time staff and 500 contractors in July.
2026Scale AI
Francis deSouza becomes CEO
The former Illumina chief took over on August 10, 2026.
Acquisitions
Scale AI
- ICG Solutions2026Undisclosed
- SiaSearch2021Undisclosed
- Helia2020Undisclosed
xAI
- Memphis Colossus Datacenter Facility2024$350M
- Specialized AI Cluster Networking Assets2024$85M
- X Platform Real-Time Data Licensing Rights2023$150M
Questions about Scale AI vs xAI
Who is the CEO of Scale AI, Inc. and xAI Corp.?
Scale AI, Inc. is led by Francis deSouza and xAI Corp. is led by Elon Musk. Both serve as the top executive responsible for the company's strategy, operations, and financial performance.
When was Scale AI, Inc. founded vs xAI Corp.?
Scale AI, Inc. was founded in 2016 — 7 years before xAI Corp., which was founded in 2023. Scale AI, Inc.'s longer operating history gives it a deeper track record but also potentially more institutional inertia compared to the younger xAI Corp..
How many employees does Scale AI, Inc. have compared to xAI Corp.?
Scale AI, Inc. employs approximately 1,200 people, while xAI Corp. employs approximately 450. Scale AI, Inc. has the larger workforce at 1,200 employees, compared to xAI Corp.'s 450. A higher headcount does not necessarily imply greater efficiency — it often reflects differences in business model (e.g., manufacturing vs. software).
Where are Scale AI, Inc. and xAI Corp. headquartered?
Both Scale AI, Inc. and xAI Corp. are headquartered in United States. Their local rules and tax obligations may still differ.
Who founded Scale AI, Inc. and xAI Corp.?
Scale AI, Inc. was founded by Alexandr Wang, Lucy Guo. xAI Corp. was founded by Elon Musk.
Which company has a longer operating history — Scale AI, Inc. or xAI Corp.?
Scale AI, Inc. has been operating for approximately 10 years, making it the more established of the two companies. xAI Corp. has been in operation for around 3 years. A longer operating history often signals greater institutional resilience and brand recognition, though it can also mean slower adaptation to new market conditions.
Figures come from each company's filings and the sources linked beside them. Amounts reported in another currency are shown in US dollars at an approximate rate and marked with ~. Back to the Scale AI vs xAI overview