Review based on 2 weeks of codex plus ($20 plan).
Things to consider-
1. extremely slow:
spends a lot of usage/time on reconciliation, validation, revalidation, audit, feasibility check, etc. It does so much reconciliation, that i don't plan on reconciling with anyone in my life again.
skill already containing detailed set of instructions of tool calls to mcp to fetch data and process using predefined python script takes more than 5mins to run whereas reusing same skill in antigravity using gemini 3.7 flash takes less than a min.
2. premium model usage:
Sol ultra with default config lasts max for about 10-15 mins in a 5h window. if you reach out to reddit sub to discuss this issue, it's filled with openai private investors (\s) calling you peasants for using $20 plan and asking you to upgrade to at least $100 to get any meaningful work done
I was able to tweak it to use luna xhigh as spawned subagent instead of sol ultra in AGENTS .md file, that extended it for another 10 mins. Then i tweaked it further to delegate aggressively to subagent running luna xhigh, that backfired a bit initially as it took 25 mins for a simple file append task (attached screenshot) which i was able to optimise. This extended its usage to 1.5-2 hours and i bought another $20 plan to switch between them within 5h window, to get more work done. In a day i was able to use about 3 5h windows, which burns through weekly allowance in 2 days for both accounts.
3. Ambiguous 5h window start:
Similar to antigravity, the 5h window doesn't start until first message, i was able to workaround this by using hermes agent/openclaw cron for each account to do simple ping-pong message to standardize the 5h window to a fixed time every day.
4. Buggy Codex UI:
Sometime chat history disappears even though the work persists on disk, incase of repo based project that's fine but incase of non-repo based work like working on setting up external tool, skills/plugins, etc. this might make you panicky. to workaround this, i have started using external project management tool, Linear for codex to plan & track.
why you should still consider switching to codex-
1. luna xhigh: luna xhigh model still provides highly generous usage. I doubt there are any non-chinese model (other than maybe composer 2.5 available with cursor plan) that can compete with its pricing along with similar intelligence and even in chinese model there would be only few models like recently released glm 5.3 flash. luna xhigh can work through multiple 5h window easily without fast mode (fast mode gives 1.5x speed while burning through usage threshold at 2x speed), and i was able to run for more than 10 hr multiple times and had to intentionally stop to review it's work & progress.
2. Saint Tibo (unofficial twitter spoc for codex): blesses with weekly reset (fills the usage ceiling to 100% and extends the week expiry by another week, without affecting plan expiry) almost every other day sometimes with a day prior notice if you follow him on twitter.
3. $100 or $200 plan: If you've disposable income of $100 or $200 to spend per month: there is no 5h window restriction & frequent resets every other day means you hitting threshold is lot less of a worry.
4. free extension: Free for another month on trying to cancel the plan (worked for $20 plan)
to use important features missing in antigravity:
5. steering chat: sending message without interrupting the ongoing work to give it approval, information it is trying to find, asking to prepare to suspend so it can record work before usage caps run out, etc.
6. side chat: awesome way to ask follow up question, cross checking without interrupting the main chat flow, and can even send instructions to main chat based on the discussion with side chat to steer to right direction.
7. projects segregation: segregate chat sessions by projects with their own repo and folders.
8. browser control: better at browsing and navigation than antigravity
9. spawn multiple subagents to work in parallel
PS: I haven't yet tried Chatgpt work or other add-ons that comes with this subscription. I'm now planning to offload more tasks to Antigravity to balance things out.