PeopleofSuperintelligence

Lab leader

Andrew Tulloch

Andrew Tulloch is an AI researcher whose work links large-scale machine-learning systems and model training. He grew up in Perth, Australia, studied mathematics at the University of Sydney and Cambridge, and won Sydney’s University Medal for his honours thesis in 2011. At Facebook and Meta, his co-authored papers cover rapid ImageNet training and large-scale recommendation systems. He joined OpenAI in 2023 and helped train GPT-4o, GPT-4.5, and o3 before co-founding Thinking Machines Lab in 2025. As of October 2026, he is at Anthropic.

Now at
Anthropic
Works
12

Publication numbers from OpenAlex, as of 15 October 2026. Citations and h-index are hidden because this OpenAlex record may be incomplete or mix in other authors.

Timeline

  1. 2011

    A University Medal

    Raised in Perth, Australia, he studies mathematics at the University of Sydney and University of Cambridge, and wins Sydney’s University Medal for his honours thesis in 2011.

  2. 2012

    Joining Facebook

    He moves to the United States and joins Meta, then known as Facebook, in 2012.

  3. 2017

    Training ImageNet in an hour

    With a Caffe2 system, he co-authors a 2017 paper that trains ResNet-50 on 256 GPUs in one hour with minibatches of 8,192.

  4. 2021

    Scaling recommendation systems

    A 2021 Facebook paper he co-authors introduces ZionEX, a software-hardware system for distributed training of large recommendation models.

  5. 2023–2025

    Training OpenAI models

    During his OpenAI work, he helps train GPT-4o, GPT-4.5, and o3 after joining in 2023.

  6. 2025

    Co-founding Thinking Machines Lab

    As a co-founder of Thinking Machines Lab in 2025, he works on pretraining and reasoning.

  7. October 2025

    Moving to Meta

    In October 2025, AI researcher Andrew Tulloch leaves Thinking Machines Lab for Meta.

  8. September 2026

    Joining Anthropic

    At Anthropic, he joins its inference and performance team in September 2026.

Sources and credits

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  1. Andrew Tulloch (B. Science – Hons) – Engineer, Facebook | Fresh Out of Sydney Uni freshoutofsydneyuni.wordpress.com. Checked 15 October 2026.
  2. Andrew Tulloch tullo.ch. Checked 15 October 2026.
  3. Meta offered this Australian $1.5 billion. Now he’s joining Anthropic. forbes.com.au. Checked 15 October 2026.
  4. Accurate, Large Minibatch SGD: Training ImageNet in 1 Hour arxiv.org. Checked 15 October 2026.
  5. Software-Hardware Co-design for Fast and Scalable Training of Deep Learning Recommendation Models arxiv.org. Checked 15 October 2026.
  6. Mira Murati’s Stealth AI Lab Launches Its First Product wired.com. Checked 15 October 2026.
  7. Thinking Machines Lab co-founder Andrew Tulloch heads to Meta techcrunch.com. Checked 15 October 2026.