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ChatGPT vs Z.ai

Two fact sheets from our own research, side by side — pricing, platforms, API access and status re-checked by us rather than quoted from the vendors.

The short answer

Cheaper paid plan
ChatGPT — $8/mo vs $18/mo for Z.ai
Free plan
Both have one
Public API
Both have one
Higher Trust score
Z.ai — 96 vs 86 for ChatGPT
Best fit
ChatGPT: General knowledge work, drafting, analysis and code across one interface · Z.ai: Developers wanting lower per-token API pricing than several Western providers

From our own records as of each tool's last check. Anything we have not confirmed is left out rather than guessed. How we verify

ChatGPTGeneral assistant with tools, memory, files and voiceZ.aiWeb chatbot and API access to Zhipu AI's GLM reasoning models, including a 1M-token context window.

Side by side

FactChatGPTZ.ai
CategoryGeneral-purpose AI ChatbotsGeneral-purpose AI Chatbots
Pricing modelFreemiumFreemium
Starts at$8/mo$18/mo
Public APIYesYes
Trust score86 / 10096 / 100
PlatformsWeb, iOS, Android, macOS, Windows, APIWeb, API
CompanyOpenAIZhipu AI (Z.ai)
Launched2022—
Last verifiedOct 16, 2026Oct 15, 2026

What our research says

ChatGPT

ChatGPT is the default general assistant and the one everyone else is measured against, but the tier you need is rarely the one you first buy. Free is now ad-supported, and the jump to genuinely unlimited reasoning is steep.

Pros

  • Broadest tool surface of any consumer assistant: browsing, code, images, voice, connectors
  • The $8 Go tier closed the gap between free and a $20 commitment
  • Apps on every desktop and mobile platform, not just a web wrapper
  • Model quality is consistently at or near the front of the field

Cons

  • Advertising now appears on the free and Go tiers
  • Message and reasoning limits are opaque and change without notice
  • Tier structure has churned repeatedly, so any price you quote ages fast
  • The API is a separate purchase, which surprises buyers who assume Plus includes it

Z.ai

Z.ai is worth knowing about mainly because of what's behind it: Zhipu AI is one of the few foundation-model companies with a public listing, and GLM's context window and agentic tool-use benchmark competitively against larger US labs. The free chat is a fine general assistant, but most of the value for developers sits in the metered API and the coding subscription rather than the consumer chat page.

Pros

  • Free web chat with no signup friction for basic use
  • API pricing undercuts several Western foundation-model providers per token
  • 1M-token context window on the flagship GLM line

Cons

  • Company and data handling are based in China, which rules it out for some compliance policies
  • Model naming and version numbers change frequently, making comparisons harder to track
  • English-language documentation lags behind the Chinese-language originals in places

Which one fits

Choose ChatGPT if you need

  • General knowledge work, drafting, analysis and code across one interface
  • Anyone who wants file, image, voice and browsing input without assembling tools
  • Teams that need admin controls and data-retention terms via Business or Enterprise
  • Light users who want more headroom than free without paying $20

Choose Z.ai if you need

  • Developers wanting lower per-token API pricing than several Western providers
  • Users comfortable with a Chinese-developed model for general chat
  • Teams evaluating GLM's long context window for document-heavy tasks

ChatGPT vs Z.ai: the questions people ask

Is ChatGPT cheaper than Z.ai?

On published entry prices, ChatGPT starts lower — $8/mo against $18/mo for Z.ai. Entry price is the lowest paid plan as we last verified it; what each plan includes differs.

Does ChatGPT or Z.ai have a free tier?

Both: ChatGPT has a free tier, and Z.ai has a free tier.

Which has a public API, ChatGPT or Z.ai?

Both ship a public API, so either can be built on; the fact table above shows the platforms each one runs on.

More comparisons

All ChatGPT alternatives →All Z.ai alternatives →Browse all General-purpose AI Chatbots →