Nate Rush
CTO of METR; previously founder and CEO of the Python tooling company Mito
- Chief Technology Officer, METR (Model Evaluation & Threat Research)12
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
Career
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
Measuring the Impact of Early-2025 AI on Experienced Open-Source Developer Productivity (external site: arxiv.org)Published research
Second author of METR's 2025 randomized controlled trial on how AI tools affected the productivity of experienced open-source developers working on their own repositories.31
Career timeline
Mar 2025
Co-authored METR's study measuring AI ability to complete long software tasks.4
Jul 2025
Co-authored METR's randomized controlled trial on early-2025 AI and developer productivity.3
Mar 10, 2026
Co-authored METR's analysis of whether test-passing SWE-bench Verified pull requests would be merged.1
Jul 21, 2026
Co-authored METR's proposal of an expenditure horizon measure of AI agents' optimization ability.1
Sep 27, 2026
Co-authored METR's write-up on a per-action monitor for safer evaluations.1
Other documented roles
Roles the sources document but that are not confirmed as current.
Related people
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- Hamel HusainEvaluation and benchmarks
- Beth BarnesAlso at METR
- Harold BoothEvaluation and benchmarks
- Hjalmar WijkAlso at METR
- Jeff HuberDeveloper tools
- John YangEvaluation and benchmarks
- Kilian LieretEvaluation and benchmarks
- Shawn LewisDeveloper tools
- Terry Yue ZhuoEvaluation and benchmarks
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