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Equation 41 · Why Coding Agents Fail: Long-Horizon Reliability in OpenAI Codex

What does this equation mean?

KiK_i

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the check cost. Read the equation part by part below; each part has a contextual explanation and a link to its mathematical background.

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KiK_i

Symbol K_i

the check cost.

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subscript

subscript

The lower label selects a particular version, component, or indexed member of the quantity. For example, x₀ and xₜ can be values at different positions.

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How to interpret it

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What the article says around this equation

Checkpoint placement is a value-of-information problem. Let an unchecked latent error at stage i create expected downstream loss LiL_i , a check cost KiK_i , detection probability did_i , and false-alarm cost FiF_i . A check is favorable when, approximately,

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