Claude 3.7 SonnetvsGLM 4.5 Air
GLM 4.5 Air is cheaper than Claude 3.7 Sonnet at $0.2/M vs $3/M input tokens.
| Spec | Claude 3.7 Sonnet | GLM 4.5 Air |
|---|---|---|
| Input price | $3/M tokens | $0.2/M tokens |
| Output price | $15/M tokens | $1.1/M tokens |
| Context window | 200K tokens | 128K tokens |
| Weights | — | Open |
| Free API (OpenRouter) | No | No |
| Released | Feb 2025 | Jul 2025 |
Our Verdict
Claude 3.7 Sonnet
GLM 4.5 Air
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
API pricing
Cost per 1M tokens
Claude 3.7 Sonnet
Input
$3.00
Output
$15.00
GLM 4.5 Air
Input
$0.20
15× cheaper
Output
$1.10
14× cheaper
GLM 4.5 Air is cheaper on both: 15× input, 14× output.
Where to run it
3 hosts, cheapest first
Claude 3.7 Sonnet
No hosts listed on OpenRouter.
Per million tokens. Prices and uptime via OpenRouter, checked 8 Sep 2026.
Writing DNA
Style Comparison
Similarity
44%
GLM 4.5 Air uses 31.7x more emoji
Claude 3.7 Sonnet
GLM 4.5 Air
61%Vocabulary50%
33wSentence Length18w
0.83Hedging0.40
2.2Bold5.1
4.9Lists4.3
0.00Emoji0.32
1.78Headings0.66
0.16Transitions0.09
Based on 26 + 27 text responses
Research
What we learned reading every model
FAQ
Common questions
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