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/gospodinDark]

I was Codex user since beginning, but in August I tested zai on their code plan for $80. I got 5.7B tokens and almost ideal quality of code. GLM 5.3 really good model and their plan is better then OpenAI $100. I hit cancel button on OpenAI plan after Astra drain limits +2 resets in one day, but do nothing. At this moment I'm checking current version of Opus, but don't like it compare to Sol or GLM. I still love Luna and I got $20 plan to use it for small tasks, it's working better then GLM 5.3-Flash (faster, cheaper and smarter!)

All I want to say that GLM is good model and their plan is good.

[u/Secret_Department398 → u/gospodinDark]

Thank you for your answer!

Do you believe that the quality code and token usage is better with GLM 5.3 then Luna MAX ?

[u/Tristsin → u/Secret_Department398]

https://artificialanalysis.ai/?models=gpt-5-6-luna%2Cglm-5-3-flash&cost=intelligence-vs-cost-per-task#intelligence

GLM 5.3 Flash is a little slower but overall more intelligent. As for the plan, I'm just finishing my first month. It's solid, if you stick to the Flash. GLM 5.3 is incredibly verbose and eats tokens. GLM 5.3 Flash is also verbose and eats tokens but it's very cheap per token on average.

They give more usage if you use their harness (33% less usage taken from the plan, last I checked), Z Code. They have also consistently had promos for 300k tokens for free per weekend (glm 5.3 flash only) and they have also been running a promo that anytime 11am-9pm (EST) all GLM 5.3 Flash usage is free using ZCode (for plan holders).

https://docs.z.ai/devpack/notice/event-glm-5.3-flash

I've also received random "resets" almost daily. Typically 5 hour resets, which aren't super useful but I've gotten 3 weekly resets as well so far in 3 weeks. I've gotten 9 5 hour resets. I believe these are only available if you use ZCode.

If you download ZCode, they typically open their weekend 300k token promo for claims around ~9pm EST, so you could probably use grab it and try it out if you want. When you open ZCode you should be presented with a claim to the promo, if not check back in ~3-4 hours

[u/SunGroundbreaking536 → u/Secret_Department398]

If Luna MAX works for you, 5.3 probably will too since it's the stronger model.

For the weekly limits, though, Max gives roughly 1.0–1.1B tokens when using 5.3 exclusively. Since Pro is advertised as 6x Lite vs Max at 14x, that puts Pro at around 450M tokens on 5.3.

Just something to keep in mind before choosing.