I’m a ChatGPT Plus user, and I tried Codex 5.6 sol at Ultra for a repository-wide code change in what I would describe as a low-to-medium-sized repository by real software-project standards.

The task involved inspecting the existing architecture, preserving current behavior, adding a parallel workflow, updating UI state, persistence, data loading, migration tooling, and running validations afterward.

I gave it detailed instructions to plan first, avoid unnecessary rewrites, preserve backward compatibility, use scripts for bulk changes, and ask questions before implementation.

To be fair, it completed a substantial amount of work. It changed multiple connected systems, generated migration and validation tooling, updated persistence logic, and produced a detailed report of what it had tested.

But the two Codex runs lasted only:

* 1h 3m 15s
* 29m 37s

That is a total of **1h 32m 52s**, and it consumed **100% of my weekly Ultra usage**.

I expected this kind of task to use maybe around 25–30% of the weekly allowance. I assumed Ultra would be more efficient with its reasoning and tool usage, not consume the entire quota in a little over 90 minutes.

The result was also not fully complete logically. Some application-state flows and edge cases were still missing or incorrect, despite the implementation summary and passing validations. These issues only became obvious during manual testing.

I have used Codex for many months, and I honestly think 5.5 at Extra High could probably have completed the same task with significantly less usage, even with the reduced limits now.

In hindsight, the previous five-hour limit may actually have been useful. It might have forced the agent to stop, summarize its progress, and let me review the implementation before consuming the entire weekly quota.

Has anyone else on Plus tried **5.6 sol at Ultra** on a meaningful repository-level task?

Did it also burn through your weekly usage this quickly, and did the quality justify the cost?

Codex 5.6 sol at Ultra used 100% of my weekly usage in 1h 32m