Grok
Our pickGLM / Z.ai (Zhipu AI)
Tier-list head-to-head. GLM / Z.ai (Zhipu AI) takes the A-tier slot — here's the breakdown.
Spec sheet
| Grok | GLM / Z.ai (Zhipu AI) | |
|---|---|---|
| Tier | B-tier | A-tierwin |
| Overall score | 7.5 / 10 | 8.0 / 10win |
| Free tier | Yes | Yes |
| Starting price | $0 | $0 |
| Best for | People who live on X/Twitter and want an AI that can tap into that data in real-time. | Teams that need genuine MIT-licensed frontier open weights with no commercial strings. |
| Last reviewed | 2026-05-21 | 2026-04-17 |
Head-to-head
Rated 1-10 on the same rubric across all 130 tools we cover.
Vibe check
How each tool actually sounds when you talk to it.
“The irreverent contrarian”
“The Z.ai research model”
What you'll pay
Look past the headline number -- entry-tier limits drive most cost surprises.
Free tier available
Free tier available
Grok 4.20 vs GLM-5.1 (744B MoE / 40B active)
| Benchmark | Grok | GLM / Z.ai (Zhipu AI) |
|---|---|---|
| GPQA Diamond | 85% | 74.5% |
| HumanEval | 90% | 89.1% |
The decision
Use-case anchors and category strengths, side by side.
People who live on X/Twitter and want an AI that can tap into that data in real-time. Also good for users who find mainstream chatbots too sanitized and want something with more personality.
Visit GrokTeams that need genuine MIT-licensed frontier open weights with no commercial strings. Especially strong for agentic workflows and vision (GLM-4.6V).
Visit GLM / Z.ai (Zhipu AI)Bottom line
GLM / Z.ai (Zhipu AI) edges out Grok by 0.5 points (8.0 vs 7.5) -- a A-tier vs B-tier split that's narrow but real. Not a blowout; both belong on a shortlist. The score gap shows up most clearly in the categories that matter for GLM / Z.ai (Zhipu AI)'s strengths, so if those categories are your priority, the lead translates.
Pricing-wise, both tools have a free tier (Grok starts $0, GLM / Z.ai (Zhipu AI) starts $0), so you can test either without committing. Compare what each free tier actually unlocks -- usage caps, model access, and feature gates differ a lot more than the headline price suggests, especially as both vendors have tightened limits in 2026.
By use case: pick Grok when people who live on x/twitter and want an ai that can tap into that data in real-time. Pick GLM / Z.ai (Zhipu AI) when teams that need genuine mit-licensed frontier open weights with no commercial strings. The two tools aren't fighting for the same person -- they're aiming at adjacent jobs that occasionally overlap. If you're squarely in GLM / Z.ai (Zhipu AI)'s lane, the tier-list ranking and the use-case fit point the same direction; if you're in Grok's lane, the score gap matters less than the fit.
Bottom line: GLM / Z.ai (Zhipu AI) is the safer default for most readers, but Grok is competitive enough that the tie-breaker is your specific workload, not the spec sheet.
Keep digging
Full Grok review
Tier B · 7.5/10
Full GLM / Z.ai (Zhipu AI) review
Tier A · 8.0/10
Grok alternatives
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GLM / Z.ai (Zhipu AI) alternatives
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Built from our daily AI-tool sweep, last touched May 21, 2026. Honest tier-list reviews — no affiliate-link pieces disguised as advice. See the rubric or how we review.