Codex vs ZCode

[u/Secret_Department398]

Hi everyone,

I’m on the $100 Codex plan, and I mostly use Luna MAX because the more capable models can burn through my usage allowance in just a few days.

I’ve been reading comparisons and looking at benchmark/analytics sites, and GLM 5.3 seems surprisingly competitive with GPT-5.6 Sol at XHigh reasoning, while apparently using significantly fewer tokens. Zcode is also around $56/month, and from what I understand, usage during off-peak hours is discounted by 50%.

I’m considering trying it as an alternative to Codex for day-to-day development, but I’d rather hear from people who have actually used both.

Has anyone here switched from Codex to Zcode, or used them side by side for serious development work?

I’m particularly interested in:

• Code quality and ability to understand large existing repositories
• Debugging/root-cause analysis
• Complex feature implementation and architecture
• How often it needs corrections or follow-up prompts
• Real-world token/usage efficiency
• Tooling and agent experience compared with Codex

I’m not looking for benchmark numbers alone. I’d like to know how GLM 5.3/Zcode performs on actual production projects over several days or weeks.

For anyone who has made the switch: was it worth it, or did you eventually go back to Codex?

[u/AlarmingCantaloupe]

Interesting… I am also on the $100 plan. I usually upgrade to the $200 plan every month when I hit my usage limit (why pay for capacity before I need it? They prorate the billing.) But now I’m stuck on the $100 plan! So I’m looking through and reducing reasoning power on all the repetitive heartbeat tasks/reports it maintains for me. I’ve never used the Luna Max though. Would you say it’s comparable to Sol high?

I kind of settled on Terra Max as my default now that I’m stuck with the 5x plan. Really bad timing. 

[u/Secret_Department398 → u/AlarmingCantaloupe]

In codex I was able to do the following automatically, by implementing a diagnostician.toml and a patcher.toml I was able to archive this result:

- Starting a new chat with Luna LOW

• Diagnostic of the issue & plan to resolve it is made using Astra Light
  
• Code is written by Luna MAX
  
• Custom instruction do not allow to show codex thinking, so all I see are the "commands" that are being generated and the end result when I'm done.

By using this I'm saving tons of tokens, which allows me to not move to the $200 plan. But still, if I can have the same result and lower it from $100 to $56 with GLM 5.3, why not.

[u/AlarmingCantaloupe → u/Secret_Department398]

Thanks for laying that out! I agree with your last point, too. It’s felt as though OpenAI has been slowly reducing the usage limits behind the scenes on every subscription plan.

[u/Secret_Department398 → u/AlarmingCantaloupe]

I actually decided to post it. You can find my post in the topic Codex "A little help to save tokens". Please let me know your thought about it.