Our pickChatGPT
GLM / Z.ai (Zhipu AI)
Tier-list head-to-head. ChatGPT takes the A-tier slot — here's the breakdown.
Spec sheet
| ChatGPT | GLM / Z.ai (Zhipu AI) | |
|---|---|---|
| Tier | A-tierwin | A-tier |
| Overall score | 8.8 / 10win | 8.0 / 10 |
| Free tier | Yes | Yes |
| Starting price | $0 | $0 |
| Best for | Everyone. | Teams that need genuine MIT-licensed frontier open weights with no commercial strings. |
| Last reviewed | 2026-04-24 | 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 eager generalist”
“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
GPT-5.5 (launched 2026-04-23; scores below are the GPT-5.4 baseline -- GPT-5.5 launch benchmarks per OpenAI are logged in Known Issues, pending third-party verification) vs GLM-5.1 (744B MoE / 40B active)
| Benchmark | ChatGPT | GLM / Z.ai (Zhipu AI) |
|---|---|---|
| GPQA Diamond | 92.8% | 74.5% |
| HumanEval | 95% | 89.1% |
The decision
Use-case anchors and category strengths, side by side.
Everyone. Seriously -- if you're new to AI or want the most complete all-in-one package, ChatGPT is the default recommendation.
Visit ChatGPTTeams 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
ChatGPT edges out GLM / Z.ai (Zhipu AI) by 0.8 points (8.8 vs 8.0) -- a A-tier vs A-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 ChatGPT's strengths, so if those categories are your priority, the lead translates.
Pricing-wise, both tools have a free tier (ChatGPT 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 ChatGPT when everyone. 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 ChatGPT's lane, the tier-list ranking and the use-case fit point the same direction; if you're in GLM / Z.ai (Zhipu AI)'s lane, the score gap matters less than the fit.
Bottom line: ChatGPT is the safer default for most readers, but GLM / Z.ai (Zhipu AI) is competitive enough that the tie-breaker is your specific workload, not the spec sheet.
Keep digging
Full ChatGPT review
Tier A · 8.8/10
Full GLM / Z.ai (Zhipu AI) review
Tier A · 8.0/10
ChatGPT alternatives
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GLM / Z.ai (Zhipu AI) alternatives
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Built from our daily AI-tool sweep, last touched April 24, 2026. Honest tier-list reviews — no affiliate-link pieces disguised as advice. See the rubric or how we review.