Scale AI, Inc.
Company History
Scale AI History: Founding, Growth & Key Milestones
Founded 2016 in San Francisco, California, United States
When was Scale AI founded?
Scale AI was founded in 2016 in San Francisco, California, United States by Alexandr Wang and Lucy Guo, making it 10 years old.
- Founded
- 2016
- Founding place
- San Francisco, California, United States
- Founders
- Alexandr Wang and Lucy Guo
- Headquarters today
- San Francisco, California, United States
- Milestones documented
- 8 (2016–2026)
- Current CEO
- Francis deSouza
- Acquisitions
- 3
| Year | Event |
|---|---|
| 2016 | Scale AI founded |
| 2018 | Lucy Guo departs |
| 2019 | Series C and unicorn status |
| 2021 | Series E at $7.3 billion |
| 2024 | Series F at $13.8 billion |
| 2025 | Meta invests $14.3 billion |
| 2025 | Layoffs |
| 2026 | Francis deSouza becomes CEO |
- Where was Scale AI founded?
- Scale AI was founded in San Francisco, California, United States in 2016.
- Who founded Scale AI?
- Scale AI was founded by Alexandr Wang and Lucy Guo.
- When did Scale AI start?
- Scale AI was founded in 2016.
- How old is Scale AI?
- Scale AI is 10 years old as of 2026.
Founding Story
Alexandr Wang left MIT after his freshman year in 2016 and joined Y Combinator with Lucy Guo, a Carnegie Mellon dropout and Thiel Fellow who had worked at Quora and Snapchat. They first pitched an API for human tasks, then focused on labeling camera and lidar data for self-driving car companies. Self-driving work carried Scale to a $1 billion valuation in 2019. Guo left in 2018. Wang led the shift to language-model data and defense work and ran the company until June 2025, when he joined Meta.
Founders
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. In June 2025 he joined Meta as Chief AI Officer to lead Meta Superintelligence Labs as part of Meta's $14.3 billion investment. He remains chairman of Scale's board. Alexandr Wang was born in 1997. Education: Massachusetts Institute of Technology; Los Alamos High School.
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. In 2022 she founded Passes, a platform for paid creator content.
Key Milestones
Scale AI founded
Alexandr Wang and Lucy Guo founded Scale in Y Combinator's S16 batch.
Source: en.wikipedia.orgSeries C and unicorn status
Founders Fund led a $100 million round valuing Scale above $1 billion.
Source: en.wikipedia.orgSeries E at $7.3 billion
Scale raised $325 million at a $7.3 billion valuation.
Source: en.wikipedia.orgSeries F at $13.8 billion
Accel led a $1 billion round with Nvidia, Amazon and Meta participating.
Source: en.wikipedia.orgMeta invests $14.3 billion
Meta took 49% at a valuation above $29 billion; Wang joined Meta and Jason Droege became interim CEO.
Source: scale.comMajor Acquisitions
ICG Solutions
2026Enhance national security and intelligence offerings.
SiaSearch
2021Data management for autonomous driving.
Helia
2020Video AI and computer vision models.
Keep researching Scale AI
Scale AI Company History FAQ
When and where was Scale AI founded?
Scale AI was founded in June 2016 in San Francisco, California, by Alexandr Wang and Lucy Guo after being accepted into the prestigious Y Combinator Summer 2016 (S16) startup accelerator batch.
How did Alexandr Wang start Scale AI at age 19?
Alexandr Wang was a 19-year-old mathematics and computer science student at MIT who had previously worked as an algorithm developer at Quora and Addepar. Recognizing that machine learning engineers spent 80% of their time manually preparing data rather than writing code, he dropped out of MIT after his freshman year to build an API for human-in-the-loop data labeling.
What was Scale AI's original product focus?
Scale AI initially focused on sensor fusion and 3D computer vision annotation for autonomous vehicles. It built specialized tooling to label LiDAR point clouds, radar feeds, and camera video with 3D bounding boxes for self-driving leaders like Cruise, Waymo, Toyota, and Lyft.
When did Scale AI achieve unicorn status?
In August 2019, Scale AI achieved a $1 billion unicorn valuation after closing a $100 million Series C funding round led by Peter Thiel's Founders Fund, making 22-year-old Alexandr Wang one of the youngest unicorn founders in Silicon Valley history.
What role did Lucy Guo play in Scale AI's early years?
Lucy Guo co-founded Scale AI at age 21, leading product design and front-end interface engineering. A Carnegie Mellon graduate and Thiel Fellow who previously worked at Quora and Snapchat, Guo helped scale the business through its early funding rounds before stepping back from active operations in 2018.
How did Scale AI pivot into Generative AI and Large Language Models (LLMs)?
In 2021-2022, anticipating the generative AI boom, Scale AI expanded from image annotation to Reinforcement Learning from Human Feedback (RLHF), safety red-teaming, and fine-tuning for LLMs, becoming the premier data partner for OpenAI, Meta, Google, and Anthropic.
What was the launch of Scale Donovan in 2023?
In 2023, Scale AI launched Donovan, an AI-powered decision-making operating system designed specifically for the US Department of Defense, intelligence agencies, and military commanders to analyze classified intelligence, plan logistics, and evaluate battlefield scenarios in real time.
What was Scale AI's landmark Series F funding round in May 2024?
In May 2024, Scale AI raised $1.0 billion in Series F funding at a $13.8 billion valuation. The round was led by Accel and joined by a syndicate of tech giants including Nvidia, Amazon, Meta, Alphabet (Google), and Coatue, cementing Scale's role as core infrastructure for the AI industry.
What is Scale SEAL and why was it established?
In 2024, Scale AI launched SEAL (Safety, Evaluations, and Alignment Lab), an independent evaluation initiative providing authoritative, uncheatable benchmarks and leaderboards that evaluate frontier models on reasoning, coding, hallucination rates, and biosecurity safety.
What was Remotasks and how did it evolve into Outlier.ai?
Scale launched Remotasks in 2017 to manage crowdsourced image annotation across global gig workers. As generative AI demanded expert contributors, Scale evolved this network into Outlier.ai, recruiting software engineers, PhD researchers, mathematicians, and linguists to write complex RLHF training data.
How did Scale AI partner with Meta on the open-source Llama models?
Scale AI partnered closely with Meta to provide high-quality human preference data, instruction-tuning datasets, and rigorous safety red-teaming for the open-source Llama 2 and Llama 3 foundation models, proving that open models could rival closed proprietary systems.
How has Alexandr Wang advised the US government on AI national security?
Alexandr Wang has testified frequently before the US Congress and advised defense leaders, arguing that artificial intelligence is the defining geopolitical contest between the United States and China, advocating for rapid military adoption of commercial AI technologies.
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