GLM 4.5 AirvsGrok 4.20 Beta
GLM 4.5 Air is cheaper than Grok 4.20 Beta at $0.2/M vs $2/M input tokens.
| Spec | GLM 4.5 Air | Grok 4.20 Beta |
|---|---|---|
| Input price | $0.2/M tokens | $2/M tokens |
| Output price | $1.1/M tokens | $6/M tokens |
| Context window | 128K tokens | 2.0M tokens |
| Weights | Open | Closed |
| Free API (OpenRouter) | No | No |
| Released | Jul 2025 | Mar 2026 |
Our Verdict
Grok 4.20 Beta
GLM 4.5 AirRunner-up
Not enough votes to call it. On the specs, Grok 4.20 Beta has the edge: bigger model tier, newer, bigger context window.
GLM 4.5 Air costs 5.5x less per token.
Slight edge
API pricing
Cost per 1M tokens
GLM 4.5 Air
Input
$0.20
10× cheaper
Output
$1.10
5.5× cheaper
Grok 4.20 Beta
Input
$2.00
Output
$6.00
GLM 4.5 Air is cheaper on both: 10× input, 5.5× output.
Where to run it
4 hosts, cheapest first
Grok 4.20 Beta1 host
Per million tokens. Prices and uptime via OpenRouter, checked 8 Sep 2026.
Writing DNA
Style Comparison
Similarity
56%
GLM 4.5 Air uses 31.7x more emoji
GLM 4.5 Air
Grok 4.20 Beta
50%Vocabulary57%
18wSentence Length20w
0.40Hedging0.35
5.1Bold4.2
4.3Lists3.7
0.32Emoji0.00
0.66Headings0.62
0.09Transitions0.14
Based on 27 + 23 text responses
Research
What we learned reading every model
FAQ
Common questions
Keep exploring
More comparisons
GLM 4.5 Air vs Ox AlphaNew provider
GLM 4.5 Air vs MiniMax M3New provider
GLM 4.5 Air vs GPT-5New provider
GLM 4.5 Air vs Claude Opus 4New provider
GLM 4.5 Air vs Qwen3.5 122B A10BNew provider
GLM 4.5 Air vs Qwen3.5 27BNew provider
GLM 4.5 Air vs Qwen3.5 35B A3BNew provider
GLM 4.5 Air vs Qwen3.5 397B A17BNew provider