Equation 9 · Part 2 · OpenAI Codex as a Software-Engineering System: Models, Harnesses, and Evidence

subscript

U_t

subscript

What this part means

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.

Its job in the formula

A subscript distinguishes a version, component, step, or member of a quantity. It does not automatically mean multiplication.

Full expressionsubscriptArticle meaning

The passage around this formula

where $\pi_{\theta,t}$ is the model policy at time t ; $H_t$ is the harness and its context/state machinery; $\mathcal T_t$ is the available tool set; $P_t$ is the permission and sandbox policy; $E_t$ is the execution environment; $V_t$ is the collection of verification functions; and $U_t$ represents user and institutional authority. The time index is essential. OpenAI can update the model, CLI, documentation, or cloud runtime without changing the product name.

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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.

Open the illustrated subscripts: which member of a family? guide →

Sources cited in the article section

These citations provide research context; check each source for the exact claim it supports.