GLM 5.1vsGPT-5
GPT-5 is cheaper than GLM 5.1 at $1.25/M vs $1.4/M input tokens.
| Spec | GLM 5.1 | GPT-5 |
|---|---|---|
| Input price | $1.4/M tokens | $1.25/M tokens |
| Output price | $4.4/M tokens | $10/M tokens |
| Context window | 203K tokens | 400K tokens |
| Weights | Open | Closed |
| Free API (OpenRouter) | No | No |
| Released | Apr 2026 | Aug 2025 |
Our Verdict
GPT-5
GLM 5.1Runner-up
Not enough votes to call it. On the specs, GPT-5 has the edge: bigger model tier, bigger context window, major provider backing.
Too close to call
API pricing
Cost per 1M tokens
GLM 5.1
Input
$1.40
Output
$4.40
2.3× cheaper
GPT-5
Input
$1.25
1.1× cheaper
Output
$10.00
GPT-5 wins input (1.1× cheaper)·GLM 5.1 wins output (2.3× cheaper)
Where to run it
17 hosts, cheapest first
GLM 5.115 hosts
Baidu Qianfanfp8$0.96 in$3.03 out203k99.8% upStreamLakefp8$0.97 in$3.04 out200k99.6% upDeepInfrafp4$1.05 in$3.50 out203k100% upSiliconFlowfp8$1.19 in$3.74 out205k99.9% upCrusoefp8$1.20 in$4.40 out203k99.8% upAtlasCloudfp8$1.26 in$3.96 out203k99.6% up
9 more hostsFewer hosts
Alibaba Cloudfp8$1.33 in$4.18 out203k100% upNovitafp8$1.38 in$4.40 out205k99.7% upFriendli$1.40 in$4.40 out203k99.9% upGMI Cloudfp8$1.40 in$4.40 out203k99.2% upNebiusfp8$1.40 in$4.40 out203k90.8% upZ.aifp8$1.40 in$4.40 out203k99.7% upVenicefp8$1.54 in$4.84 out200k93.6% upChutesfp8degraded$0.98 in$3.08 out203k78% upPhaladegraded$1.21 in$4.20 out203k76.7% up
Per million tokens. Prices and uptime via OpenRouter, checked 9 Sep 2026.
Writing DNA
Style Comparison
Similarity
48%
GLM 5.1 uses 19.3x more bold
GLM 5.1
GPT-5
54%Vocabulary65%
18wSentence Length13w
0.31Hedging0.20
3.6Bold0.2
2.6Lists4.6
0.00Emoji0.00
0.43Headings0.16
0.11Transitions0.03
Based on 27 + 16 text responses
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