Codex Vendor post on X
Codex Day 18 is a usage reset, the ninth of the program
Changed (SGT) · OpenAI · Entry updated · Not re-checked against the vendor for this entry
On 23 Oct 2026, OpenAI: Codex Day 18 (23 Oct 2026, SGT): announced as reset day, the 9th usage reset of the 28-day program (8 global resets plus the 8 Oct banked reset). A follow-up said it lands by 10am PT on 23 Oct (1 AM SGT on 24 Oct).
PlanYield, 'Codex Day 18 is a usage reset, the ninth of the program', updated 24 Oct 2026, https://planyield.dev/changes/2026-10-23-codex-day18-reset/
Status and sources
PlanYield status: Vendor post on X. What the statuses mean.
Sources: @thsottiaux on X ↗ · @thsottiaux on X, post 2 ↗ (23 Oct 12:46 SGT)
Plans this touches
ChatGPT Free · ChatGPT Go · ChatGPT Plus · ChatGPT Pro · ChatGPT Business
Inferred: the source does not name every plan, so PlanYield chose these.
Current limits: Codex usage limits
Other OpenAI changes
22 Oct 2026 Codex Day 17 is a usage reset, the eighth of the program · 21 Oct 2026 Codex keeps prompt cache indefinitely; API adds 12h caching · 21 Oct 2026 OpenAI fixes Codex accounts metered against the wrong plan · 15 Oct 2026 GPT-5.5 leaves Codex ChatGPT sign-in
Get the Monday diff when the next change lands. All changes