GLM 4.5vsGPT-5
GLM 4.5 is cheaper than GPT-5 at $0.6/M vs $1.25/M input tokens.
| Spec | GLM 4.5 | GPT-5 |
|---|---|---|
| Input price | $0.6/M tokens | $1.25/M tokens |
| Output price | $2.2/M tokens | $10/M tokens |
| Context window | 128K tokens | 400K tokens |
| Weights | Open | Closed |
| Free API (OpenRouter) | No | No |
| Released | Jul 2025 | Aug 2025 |
| SWE-bench Verified | 64.2% | 74.9% |
Our Verdict
GPT-5
GLM 4.5Runner-up
Not enough votes to call it. On the specs, GPT-5 has the edge: bigger model tier, bigger context window.
GPT-5 wins 3 categories, Reasoning by the widest margin. GLM 4.5 costs 4.5x less per token.
Slight edge
API pricing
Cost per 1M tokens
GLM 4.5
Input
$0.60
2.1× cheaper
Output
$2.20
4.5× cheaper
GPT-5
Input
$1.25
Output
$10.00
GLM 4.5 is cheaper on both: 2.1× input, 4.5× output.
Where to run it
3 hosts
GLM 4.51 host
Per million tokens. Prices and uptime via OpenRouter, checked 9 Sep 2026.
Writing DNA
Style Comparison
Similarity
43%
GLM 4.5 uses 33.2x more emoji
GLM 4.5
GPT-5
52%Vocabulary65%
17wSentence Length13w
0.52Hedging0.20
5.6Bold0.2
4.8Lists4.6
0.33Emoji0.00
0.66Headings0.16
0.17Transitions0.03
Based on 28 + 16 text responses
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