Tibo's Codex Day 19 post lists small updates: faster dots calls, reasoning changes that no longer reset the cache mid conversation, and a new Codex CLI release

Context

Tibo works on Codex and ChatGPT at OpenAI and posts a numbered daily update; the Day 18 post is also in this deck. The post was published at 7:12 PM Eastern on October 23.

Deep dive

Tibo posted at 7:12 PM Eastern on October 23 a Day 19 update describing small changes. First, he says calls connect much faster for dots; the post does not explain that item further. Second, he says that changing the reasoning setting in Codex and in work mode partway through a conversation no longer invalidates the cache. Third, he says OpenAI updated the Codex CLI.

The cache change is the most practical item. Cached context means a model does not have to reprocess the whole conversation on every turn, which saves time and, for many plans, usage. Before this fix, according to the post, switching reasoning effort mid conversation threw that cache away.

Unlike Day 18, this post does not mention a usage limit reset. None of the three claims has a separate source beyond the post, so the Codex changelog and CLI release notes are where details would appear. The post is part of the same 28 day series that runs through the deck's Day 18 story.

What to expect next

The series continues daily, so the next posts will show whether more limit resets or larger launches follow. Release notes for the Codex CLI should list what changed in this version. Users who switch reasoning effort often can check whether their cached token counts now hold steady after a change, which would confirm the fix. Any wider rollout of the dots speed change would show up in ChatGPT release notes.