GLM 5.1vsGPT-5.3-Codex
GLM 5.1 is cheaper than GPT-5.3-Codex at $1.4/M vs $1.75/M input tokens.
| Spec | GLM 5.1 | GPT-5.3-Codex |
|---|---|---|
| Input price | $1.4/M tokens | $1.75/M tokens |
| Output price | $4.4/M tokens | $14/M tokens |
| Context window | 203K tokens | 400K tokens |
| Released | Apr 2026 | Feb 2026 |
Our Verdict
GPT-5.3-Codex
GLM 5.1Runner-up
Not enough votes to call it. On the specs, GPT-5.3-Codex has the edge: bigger model tier, bigger context window, major provider backing.
GLM 5.1 costs 3.2x less per token.
Too close to call
API pricing
Cost per 1M tokens
GLM 5.1
Input
$1.40
1.3× cheaper
Output
$4.40
3.2× cheaper
GPT-5.3-Codex
Input
$1.75
Output
$14.00
GLM 5.1 is cheaper on both — 1.3× input, 3.2× output
Writing DNA
Style Comparison
Similarity
19%
GPT-5.3-Codex uses 15.8x more emoji
GLM 5.1
GPT-5.3-Codex
54%Vocabulary65%
18wSentence Length23w
0.31Hedging0.51
3.6Bold6.5
2.6Lists6.2
0.00Emoji0.16
0.43Headings1.90
0.11Transitions0.03
Based on 27 + 23 text responses
Research
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