GLM 4.5 AirvsGrok 4
GLM 4.5 Air is cheaper than Grok 4 at $0.2/M vs $3/M input tokens.
| Spec | GLM 4.5 Air | Grok 4 |
|---|---|---|
| Input price | $0.2/M tokens | $3/M tokens |
| Output price | $1.1/M tokens | $15/M tokens |
| Context window | 128K tokens | 256K tokens |
| Weights | Open | — |
| Free API (OpenRouter) | No | No |
| Released | Jul 2025 | Jul 2025 |
Our Verdict
GLM 4.5 Air
Grok 4
Not enough votes to call it. On the specs, nothing separates them.
GLM 4.5 Air costs 14x less per token.
Too close to call
Reviewing agent-written code?See a Brief PR report
API pricing
Cost per 1M tokens
GLM 4.5 Air
Input
$0.20
15× cheaper
Output
$1.10
14× cheaper
Grok 4
Input
$3.00
Output
$15.00
GLM 4.5 Air is cheaper on both: 15× input, 14× output.
Where to run it
3 hosts, cheapest first
Grok 4
No hosts listed on OpenRouter.
Per million tokens. Prices and uptime via OpenRouter, checked 13 Sep 2026.
Writing DNA
Style Comparison
Similarity
56%
GLM 4.5 Air uses 2.1x more bold
GLM 4.5 Air
Grok 4
50%Vocabulary56%
18wSentence Length18w
0.40Hedging0.65
5.1Bold2.4
4.3Lists2.4
0.32Emoji0.60
0.66Headings0.73
0.09Transitions0.06
Based on 27 + 26 text responses
Research
What we learned reading every model
FAQ
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