GLM 5.1vsGPT-5.6 Terra
GLM 5.1 is cheaper than GPT-5.6 Terra at $1.4/M vs $2.5/M input tokens.
| Spec | GLM 5.1 | GPT-5.6 Terra |
|---|---|---|
| Input price | $1.4/M tokens | $2.5/M tokens |
| Output price | $4.4/M tokens | $15/M tokens |
| Context window | 203K tokens | 1.1M tokens |
| Released | Apr 2026 | Jul 2026 |
Our Verdict
GPT-5.6 Terra
GLM 5.1Runner-up
Not enough votes to call it. On the specs, GPT-5.6 Terra has the edge: newer, bigger context window, major provider backing.
GLM 5.1 costs 3.4x less per token.
Too close to call
API pricing
Cost per 1M tokens
GLM 5.1
Input
$1.40
1.8× cheaper
Output
$4.40
3.4× cheaper
GPT-5.6 Terra
Input
$2.50
Output
$15.00
GLM 5.1 is cheaper on both — 1.8× input, 3.4× output
Writing DNA
Style Comparison
Similarity
32%
GPT-5.6 Terra uses 2.8x more hedging
GLM 5.1
GPT-5.6 Terra
54%Vocabulary57%
18wSentence Length18w
0.31Hedging0.85
3.6Bold2.8
2.6Lists4.6
0.00Emoji0.00
0.43Headings1.12
0.11Transitions0.06
Based on 27 + 27 text responses
Research
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