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Most buyers should pick ChatGPT.
Choose ChatGPT for general conversation, image creation, file uploads, and deep research; its Go plan starts at $8 per month. Choose Z.ai for GLM models, developer APIs, or coding plans with published credit quotas. Z.ai has a free chat and API tier, and API use has no base subscription fee, but model calls cost extra. Its Lite coding plan is $18 monthly or $12.60 per month with annual billing. Check quotas before choosing a paid coding plan.
01Side by side
| ChatGPT | Z.ai | |
|---|---|---|
| Starting price | $8/month Go; Free plan also available | $0 base API; Lite $18 monthly or $12.60 annual |
| Free plan | Limited uploads, images, research, voice, and Codex | Web chat and three free API models |
| Best for | General chat, research, images, and saved chats | GLM access, coding plans, and developer APIs |
| Core strength | Chat, file uploads, image creation, and deep research | GLM models, agents, APIs, and multimodal analysis |
| Ease of use | Review ease-of-use score: 8/10 | Review ease-of-use score: 5/10 |
| Integrations/data | File uploads, saved-chat context; plugin details unpublished | Cloud APIs; MCP integrations on coding plans |
| Team/seat costs | Business: $20/user monthly annual rate; two-seat minimum | Team seat pricing not published |
| Support | Review support score: 5/10 | Review support score: 3/10 |
ChatGPT Choose ChatGPT if
- Choose ChatGPT if you want general-purpose chat and research tools.
- Choose ChatGPT if you need file uploads and saved-chat context.
- Choose ChatGPT if you want a lower-cost paid chat plan.
Z.ai Choose Z.ai if
- Choose Z.ai if you need GLM models through cloud APIs.
- Choose Z.ai if you want coding plans with stated credit quotas.
- Choose Z.ai if you prefer usage-based API billing.
02Pricing compared
Both offer free access, but the paid options target different work. ChatGPT Go is $8 per month, Plus is $20, and Pro starts at $100. The Free plan includes everyday text chats, with upload, image, deep research, voice and Codex access limited by unpublished caps. Go raises some limits, but its exact caps are also unpublished.
Z.ai’s free tier covers web chat and three free API models. Its GLM Coding Lite plan costs $18 monthly, or $12.60 per month with annual billing; the listed allowance is 2,000 credits per rolling five-hour window and 10,000 per week. API use has no base subscription fee, but model calls are billed by tokens. For example, GLM-5.3 is listed at $1.40 per million input tokens and $4.40 per million output tokens. Compare expected usage, not just the entry price.
03Features and depth
ChatGPT is the broader fit for general-purpose assistant work. Its listed features include conversational answers, image creation, file uploads, saved chat history, and a Deep research mode. Plus adds advanced reasoning models, expanded research, projects, scheduled tasks and custom GPTs. The homepage also lists a Plugins tab, but the published information does not specify which plugins are available. Free users get limited access to several tools, with exact caps not published.
Z.ai centers on the GLM model family and pairs its chat interface with agent execution and developer APIs. The platform lists multimodal analysis and web search, while its coding plans include MCP integrations and explicit credit quotas. That makes Z.ai more specifically suited to GLM access and API or coding workflows, rather than a like-for-like substitute for every ChatGPT feature. Z.ai also lists paid add-ons such as web search at $0.01 per use and GLM-Image at $0.015 per image. Check which model and quota your workload needs before committing.
04Ease of use and learning curve
For straightforward question-and-answer use, ChatGPT has the simpler starting point: type into its chat interface, and sign in to use uploads and saved chat history. Its plans get harder to compare once you need more than casual access, because several feature limits are not published.
Z.ai also offers web chat, but its choices require more planning if you are weighing models, token-priced API calls or coding-plan credits. Lite, Pro and Max publish separate five-hour and weekly quotas, while API costs depend on model and input/output tokens. If you only want chat, start with its free tier; if you need coding or API use, estimate demand against the listed limits first.
Questions people ask
Is ChatGPT or Z.ai cheaper?
For a paid general assistant, ChatGPT Go starts at $8 per month. Z.ai’s Lite coding plan is $18 monthly or $12.60 per month with annual billing. Z.ai API has no base subscription fee, but calls are usage-priced, so total cost depends on model and token volume.
Does Z.ai have a free plan?
Yes. Z.ai lists a free web chat and API tier with access to three free API models: GLM-4.7-Flash, GLM-4.5-Flash and GLM-4.6V-Flash. Platform rate limits are not published, so check the current terms before relying on it for sustained use.
Can Z.ai replace ChatGPT?
It can suit users who want GLM models, developer APIs or coding-plan quotas. ChatGPT is the stronger fit in this comparison for general conversation, image creation, file uploads and Deep research. The listed feature sets differ, so choose by workflow rather than assuming they are interchangeable.
Are Z.ai’s coding plans unlimited?
No. Lite lists 2,000 credits per rolling five-hour window and 10,000 per week; Pro lists 12,000 and 60,000, while Max lists 28,000 and 140,000. Off-peak requests use 50% of quota. Those published limits make usage worth checking before you subscribe.