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Builders & open source

Nate Rush

Chief Technology Officer, METR

Nate Rush is the chief technology officer of METR (Model Evaluation and Threat Research). Rush previously founded Mito, serving as its CEO and building Python tooling, and before that worked as a researcher at the Ethereum Foundation on consensus algorithms. Rush is second author of METR's 2025 randomized controlled trial on how early-2025 AI tools affected experienced open-source developers' productivity.123

At a glance

Current role
Chief Technology Officer
Company
METR
Sector
Nonprofit
Work listed
1
Sources cited
4
Profile reviewed

Career

Rush worked as a researcher at the Ethereum Foundation on consensus algorithms, then founded Mito and served as its CEO, building Python tooling used at large banks. Rush is now the chief technology officer of METR.12

Research at METR

Rush is second author of METR's July 2025 randomized controlled trial on early-2025 AI tools and developer productivity, and a co-author of METR's 2025 study measuring AI ability to complete long software tasks. Later METR work with Rush includes a 2026 analysis finding that many SWE-bench Verified pull requests that pass tests would not be merged by maintainers, a proposed "expenditure horizon" measure of agents' optimization ability, and a per-action monitor for safer evaluations.341

Work and contributions

Timeline

  1. Co-authored METR's study measuring AI ability to complete long software tasks.4
  2. Co-authored METR's randomized controlled trial on early-2025 AI and developer productivity.3
  3. Co-authored METR's analysis of whether test-passing SWE-bench Verified pull requests would be merged.1
  4. Co-authored METR's proposal of an expenditure horizon measure of AI agents' optimization ability.1
  5. Co-authored METR's write-up on a per-action monitor for safer evaluations.1

Other documented roles

Roles the sources document that are not confirmed as current.

  • Founder and CEO, Mito1
  • Researcher on consensus algorithms, Ethereum Foundation1

Where they work

  • METR 5 people in the wiki

Suggest a correction or removal

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References

4 sources · profile reviewed Oct 22, 2026 · data updated Oct 22, 2026

  1. Nate Rush, CTO — METR team pageMETR · Official page · accessed Oct 22, 2026
  2. About METR (leadership)METR · Official page · accessed Oct 22, 2026
  3. Measuring the Impact of Early-2025 AI on Experienced Open-Source Developer Productivity (arXiv 2507.09089)arXiv · Paper · published Jul 12, 2025 · accessed Oct 22, 2026
  4. Measuring AI Ability to Complete Long Software Tasks (arXiv 2503.14499)arXiv · Paper · published Mar 18, 2025 · accessed Oct 22, 2026