Gemini vs Z.ai

Gemini

Gemini earns its place by being the assistant that is already inside the Google products most people use: free Deep Research, image generation and a voice mode cost nothing, and the $19.99 Pro plan is where it becomes a work tool, with the top models, Gmail and Docs integration and 5 TB of storage on the same bill. Pick it if your life runs on Google; pick ChatGPT or Claude if you want the assistant separate from your email and documents, or care about a specific model family for a specific job.

Pros

• +Free tier includes Deep Research, image generation and editing, Gemini Live and Gems rather than a crippled chat
• +Paid plans bundle storage, Flow video credits, Notebook and YouTube perks, so the AI spend doubles as a Google One upgrade
• +Multimodal from the start: images, audio, video and files as input on web and mobile
• +The same models are available to developers per token on the Gemini API with a free Google AI Studio

Cons

• −Plan tiers are defined by usage multipliers (2x, 4x, 5x, 20x) with no absolute numbers, so limits are hard to compare
• −The useful work integration (Gmail, Docs) starts at $19.99, not on the $4.99 plan for Docs
• −Prices and perks vary by country and the plans page localises silently, so quoted figures may not match what you see
• −Model names and tiers change often (Argon, Pro, Flash, Flash-Lite), which makes it unclear what the free tier is actually running

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 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

Is Gemini cheaper than Z.ai?

On published entry prices, Gemini starts lower — $4.99/mo against $10/mo for Z.ai. Entry price is the lowest paid plan as we last verified it; what each plan includes differs.

Does Gemini or Z.ai have a free tier?

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

Which has a public API, Gemini 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.