Equation 1 · Part 3 · From Origins to Frontier: A History of Claude Code and Agentic Development Tools
Symbol T_0
What this part means
is one of the signed contributions combined to compute the quantity on the left.
Its job in the formula
is one of the signed contributions combined to compute the quantity on the left.
Full expression→Symbol T_0→Article meaning
The passage around this formula
A second, independently run measurement effort took a different approach: instead of asking whether an agent could solve one fixed set of tasks, it asked how long a task an agent could complete autonomously with 50% reliability, using human professional completion time as the unit. METR’s March 2025 study, compiled from 170 tasks and more than 800 human timing baselines across software engineering, cybersecurity and general reasoning work, reported that this “50%-task-completion time horizon” for frontier agents had been doubling approximately every seven months for six years running, and that the finding was robust to an order-of-magnitude error in the underlying measurements, which would…
Learn the underlying idea
A subscript is a label attached below a symbol. It often selects a time step, component, category, or member of a sequence.
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Sources cited in the surrounding passage
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