GLM 4.5 AirvsGPT OSS 20B
GPT OSS 20B is cheaper than GLM 4.5 Air at $0.02/M vs $0.2/M input tokens.
| Spec | GLM 4.5 Air | GPT OSS 20B |
|---|---|---|
| Input price | $0.2/M tokens | $0.02/M tokens |
| Output price | $1.1/M tokens | $0.1/M tokens |
| Context window | 128K tokens | 131K tokens |
| Weights | Open | Open |
| Free API (OpenRouter) | No | No |
| Released | Jul 2025 | Aug 2025 |
Our Verdict
GLM 4.5 Air
GPT OSS 20B
Not enough votes to call it. On the specs, nothing separates them.
GPT OSS 20B costs 11x 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
Output
$1.10
GPT OSS 20B
Input
$0.02
10× cheaper
Output
$0.10
11× cheaper
GPT OSS 20B is cheaper on both: 10× input, 11× output.
Where to run it
16 hosts, cheapest first
Per million tokens. Prices and uptime via OpenRouter, checked 13 Sep 2026.
Writing DNA
Style Comparison
Similarity
48%
GPT OSS 20B uses 3.4x more transitions
GLM 4.5 Air
GPT OSS 20B
50%Vocabulary54%
18wSentence Length17w
0.40Hedging0.26
5.1Bold5.9
4.3Lists3.3
0.32Emoji0.10
0.66Headings0.75
0.09Transitions0.32
Based on 27 + 21 text responses
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