Z.ai (ChatGLM) vs Grok (2026) - Side-by-side AI tool comparison

EDITORIAL PICK

Z.ai (ChatGLM)

FreemiumAI chatfreemium

Z.ai is Zhipu AI's chat and developer platform built on the GLM model family (formerly ChatGLM), and one of the fastest-moving labs of 2026. Basic chat on GLM Flash models is free and unlimited, while the flagship GLM-5.x reasoning models -- which rival Opus-class systems on agentic and coding tasks -- come via cheap coding-plan subscriptions (from ~$10/mo) or a very low-cost API. Developers get a strong, English, OpenAI-compatible platform with genuinely free Flash models, not just trial credits. The catch is China jurisdiction and PRC-aligned content rules, plus fast-shifting pricing.

Freemium · see pricing page

View Z.ai (ChatGLM) →

Grok

FreemiumAI chatconversational ai

Grok is xAI's assistant, tightly integrated into X (Twitter) and known for real-time access to public posts and a less-filtered, more conversational style. The latest Grok 4 and Grok 4 Heavy models are strong at reasoning, and the product includes image generation and voice. Access is bundled with X subscriptions or sold as standalone SuperGrok plans, with a developer API for the Grok model family. Its edge is live X data and personality; its limits are the convoluted subscription tie-in and a smaller ecosystem than the frontier labs.

Freemium · or standalone SuperGrok ($30/mo) and SuperGrok Heavy ($300/mo). Developer API billed per-token for the Grok 4.x family. As of June 2026.

View Grok →

● EDITORIAL VERDICT · BIGBANGINDEX

Z.ai (ChatGLM) edges Grok on aggregate — 88 vs 81.

The best price-to-performance AI chat and API of 2026 -- free unlimited Flash chat and near-frontier paid models for cents, if your org is comfortable with a China-based provider. Grok still wins for buyers who prioritise real-time access to public x (twitter) data. Both tools are independently scored — the right pick depends on which dimensions matter most for your workflow.

● SPEC SHEET

Side-by-side, every cell sourced.

Pricing pulled from each tool's public site. Scores follow the BigBang Score rubric — pricing transparency, free tier, API support, update frequency, unique factor, documentation, and community.

Feature

Z.ai (ChatGLM)

Grok

Pricing model

Tier and access type

Freemium

Pricing detail

First-tier sticker

Free unlimited basic chat on GLM Flash models; flagship GLM-5.x via GLM Coding Plans (~$10/$30/$80/mo tiers). API: free Flash models plus cheap paid GLM-5.x (~$1-1.40/M input). Pricing shifting fast in 2026. As of June 2026.

Limited free access via X. Paid via X Premium (~$8/mo) and Premium+ ($40/mo)

Capabilities & access

Pricing transparency

How clear the pricing page is

15/20

14/20

Free tier

Free plan generosity

14/15

10/15

API support

Public API + SDK quality

14/15

13/15

Update frequency

Shipping cadence

15/15

14/15

Quality signals

Unique factor

Differentiation from peers

13/15

14/15

Documentation

Docs depth + clarity

9/10

7/10

Community

Active user community

8/10

9/10

Verdict

BigBang Score

Composite of all 7 signals

88/100

81/100

● WHICH ONE FOR YOU?

Use-case picks.

Cut through the spec sheet. Here's what we'd recommend depending on what matters most.

Pick Z.ai (ChatGLM) if…

You prioritise unlimited free chat plus genuinely free api models and flagship glm-5.x rivals opus-class at a fraction of the cost.

ZPick: Z.ai (ChatGLM)

Pick Grok if…

You prioritise real-time access to public x (twitter) data and strong grok 4 / 4 heavy reasoning.

GPick: Grok

Editorial pick

Z.ai (ChatGLM) wins our composite score (88/100). It edges ahead on aggregate — but the right tool depends on which dimensions matter most.

ZPick: Z.ai (ChatGLM)

BigBangIndex Editorial

Independent AI tool reviews · Updated regularly

Each comparison uses the same 7-signal BigBang Score rubric. Pricing pulled from tool sites; capabilities verified against documentation. Affiliate links are disclosed inline and never affect rank.

Methodology All comparisons

● MORE COMPARISONS

Related head-to-heads in AI chat.

Z.ai (ChatGLM) vs ChatGPT — AI chat

BigBang Scores 88/100 vs 91/100. Pricing, capabilities, and editorial verdict inside.

Same categoryRead comparison →

Z.ai (ChatGLM) vs Google Gemini — AI chat

BigBang Scores 88/100 vs 90/100. Pricing, capabilities, and editorial verdict inside.

Same categoryRead comparison →

Z.ai (ChatGLM) vs DeepSeek — AI chat

BigBang Scores 88/100 vs 88/100. Pricing, capabilities, and editorial verdict inside.

Same categoryRead comparison →

● FAQ

Z.ai (ChatGLM) vs Grok - frequently asked.

Direct answers tuned for AI search engines (ChatGPT, Perplexity, Claude) and Google's People Also Ask.

The short answer.

Z.ai (ChatGLM) wins on aggregate, but Grok pulls ahead on specific axes - the spec sheet above shows where each one earns its keep.

Full Z.ai (ChatGLM) review →Full Grok review →All AI chat tools →

01Which is better, Z.ai (ChatGLM) or Grok?

Z.ai (ChatGLM) edges Grok on aggregate, 88/100 vs 81/100 on the BigBang Score. The composite is calculated from seven signals: pricing transparency, free tier, API support, update frequency, unique factor, documentation, and community. The right pick depends on which dimensions matter most for your workflow.

02Is Z.ai (ChatGLM) or Grok cheaper?

Z.ai (ChatGLM): Free unlimited basic chat on GLM Flash models; flagship GLM-5.x via GLM Coding Plans (~$10/$30/$80/mo tiers). API: free Flash models plus cheap paid GLM-5.x (~$1-1.40/M input). Pricing shifting fast in 2026. As of June 2026.. Grok: Limited free access via X. Paid via X Premium (~$8/mo) and Premium+ ($40/mo), or standalone SuperGrok ($30/mo) and SuperGrok Heavy ($300/mo). Developer API billed per-token for the Grok 4.x family. As of June 2026.. The pricing-transparency and free-tier rows in the spec table above show the precise side-by-side breakdown.

03What are the main differences between Z.ai (ChatGLM) and Grok?

Both are AI chat tools. Z.ai (ChatGLM) unlimited free chat plus genuinely free api models; Grok real-time access to public x (twitter) data. The full spec sheet above renders the per-axis differences with benchmark bars.

04Should I pick Z.ai (ChatGLM)?

Z.ai (ChatGLM) wins our composite BigBang Score, but Grok can still be the right pick if you prioritise real-time access to public x (twitter) data or strong grok 4 / 4 heavy reasoning. The use-case picks above pair each tool with the workflow it serves best.