CODEX RESET CALCULATOR — METHODOLOGY
Updated: 2026-08-09

PURPOSE
This independent planning tool compares the quota restored by a full Codex reset with the seven-day clock shift created by restarting the weekly window.

INPUTS
- Old scheduled weekly reset time from Codex /status, captured before the full reset.
- Full-reset event time (now for a simulation, or the historical reset time).
- Weekly quota used immediately before the reset.

MODEL
Let S be the old weekly-window start, D the old scheduled reset, T the full-reset event, W seven days, and U the used fraction.

S = D - W
elapsed fraction = (T - S) / W
immediate quota restored = U
new scheduled reset = T + W
clock shift = (T + W) - D = T - S
net reset edge = U - elapsed fraction

In percentage points:
net edge = used % - elapsed %

INTERPRETATION
- Above +5 percentage points: positive pace edge.
- Between -5 and +5 points: approximately neutral.
- Below -5 points: negative pace edge.

The five-point band avoids false precision from rounded usage values and timestamps.

ASSUMPTIONS
- A full reset restores both the short and weekly windows and moves the weekly reset to roughly seven days after redemption/reset.
- Calendar time is treated linearly to express the clock shift as a quota-equivalent planning cost.
- The model uses percentages because absolute account quota sizes are not publicly specified for every plan and workload.
- The calculation does not prove or estimate hidden usage, retries, or unpublished metering behavior.
- Codex /status and the account usage page remain the source of truth.

BANKED RESET DEFAULT
Use live balance before overwriting it. Redeem a banked reset when the next valuable task cannot wait for the natural reset, or before the actual expiry shown in the account. The calculator never invents an expiry date.

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