GLM 5.1vsGrok 4
GLM 5.1 is cheaper than Grok 4 at $1.4/M vs $3/M input tokens.
| Spec | GLM 5.1 | Grok 4 |
|---|---|---|
| Input price | $1.4/M tokens | $3/M tokens |
| Output price | $4.4/M tokens | $15/M tokens |
| Context window | 203K tokens | 256K tokens |
| Weights | Open | — |
| Free API (OpenRouter) | No | No |
| Released | Apr 2026 | Jul 2025 |
Our Verdict
GLM 5.1
Grok 4
Not enough votes to call it. On the specs, nothing separates them.
GLM 5.1 costs 3.4x less per token.
Too close to call
API pricing
Cost per 1M tokens
GLM 5.1
Input
$1.40
2.1× cheaper
Output
$4.40
3.4× cheaper
Grok 4
Input
$3.00
Output
$15.00
GLM 5.1 is cheaper on both: 2.1× input, 3.4× output.
Where to run it
15 hosts, cheapest first
GLM 5.115 hosts
Baidu Qianfanfp8$0.96 in$3.03 out203k99.8% upStreamLakefp8$0.97 in$3.04 out200k99.6% upDeepInfrafp4$1.05 in$3.50 out203k100% upSiliconFlowfp8$1.19 in$3.74 out205k99.9% upCrusoefp8$1.20 in$4.40 out203k99.8% upAtlasCloudfp8$1.26 in$3.96 out203k99.6% up
9 more hostsFewer hosts
Alibaba Cloudfp8$1.33 in$4.18 out203k100% upNovitafp8$1.38 in$4.40 out205k99.7% upFriendli$1.40 in$4.40 out203k99.9% upGMI Cloudfp8$1.40 in$4.40 out203k99.2% upNebiusfp8$1.40 in$4.40 out203k90.8% upZ.aifp8$1.40 in$4.40 out203k99.7% upVenicefp8$1.54 in$4.84 out200k93.6% upChutesfp8degraded$0.98 in$3.08 out203k78% upPhaladegraded$1.21 in$4.20 out203k76.7% up
Grok 4
No hosts listed on OpenRouter.
Per million tokens. Prices and uptime via OpenRouter, checked 9 Sep 2026.
Writing DNA
Style Comparison
Similarity
51%
Grok 4 uses 59.8x more emoji
GLM 5.1
Grok 4
54%Vocabulary56%
18wSentence Length18w
0.31Hedging0.65
3.6Bold2.4
2.6Lists2.4
0.00Emoji0.60
0.43Headings0.73
0.11Transitions0.06
Based on 27 + 26 text responses
Research
What we learned reading every model
FAQ
