David Rein

Researcher focused on AI agent capability evaluation at METR, co-author on work measuring AI ability to complete long tasks and on benchmarks like RE-Bench and HCAST.

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Jan 2, 2026 • 1h 47min

47 - David Rein on METR Time Horizons

David Rein, a researcher at METR specializing in AI capability evaluation, dives deep into measuring AI's ability to handle long tasks. He explains what time horizons mean for models like Claude Opus 4.5 and why they matter for assessing AI progress. The discussion includes the significance of task length, examples of varying difficulties, and the implications of AI's rapid advancements in capabilities. Rein also explores the challenges of measuring effectiveness and future risks associated with AI progression and its potential to outpace human developers.

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