Compare · ModelsLive · 2 picked · head to head
GLM 5.1 vs GPT-5.1-Codex
Side by side · benchmarks, pricing, and signals you can act on.
Winner summary
GLM 5.1 wins on 7/8 benchmarks
GLM 5.1 wins 7 of 8 shared benchmarks. Leads in coding · reasoning · language.
Category leads
coding·GLM 5.1reasoning·GLM 5.1language·GLM 5.1math·GLM 5.1knowledge·GLM 5.1
Hype vs Reality
Attention vs performance
GLM 5.1
#14 by perf·no signal
GPT-5.1-Codex
#21 by perf·no signal
Best value
GLM 5.1
2.8x better value than GPT-5.1-Codex
GLM 5.1
34.2 pts/$
$2.05/M
GPT-5.1-Codex
12.2 pts/$
$5.63/M
Vendor risk
Who is behind the model
z-ai
private · undisclosed
OpenAI
$840.0B·Tier 1
Head to head
8 benchmarks · 2 models
GLM 5.1GPT-5.1-Codex
LiveBench · Agentic Coding
GLM 5.1 leads by +1.7
GLM 5.1
55.0
GPT-5.1-Codex
53.3
LiveBench · Coding
GLM 5.1 leads by +3.6
GLM 5.1
75.4
GPT-5.1-Codex
71.8
LiveBench · Data Analysis
GLM 5.1 leads by +2.5
GLM 5.1
63.2
GPT-5.1-Codex
60.8
LiveBench · If
GLM 5.1 leads by +5.1
GLM 5.1
68.5
GPT-5.1-Codex
63.4
LiveBench · Language
GLM 5.1 leads by +2.3
GLM 5.1
71.8
GPT-5.1-Codex
69.5
LiveBench · Mathematics
GLM 5.1 leads by +5.3
GLM 5.1
84.9
GPT-5.1-Codex
79.6
LiveBench · Overall
GLM 5.1 leads by +1.6
GLM 5.1
70.2
GPT-5.1-Codex
68.6
LiveBench · Reasoning
GPT-5.1-Codex leads by +9.5
GLM 5.1
72.5
GPT-5.1-Codex
82.0
Full benchmark table
| Benchmark | GLM 5.1 | GPT-5.1-Codex |
|---|---|---|
LiveBench · Agentic Coding | 55.0 | 53.3 |
LiveBench · Coding | 75.4 | 71.8 |
LiveBench · Data Analysis | 63.2 | 60.8 |
LiveBench · If | 68.5 | 63.4 |
LiveBench · Language | 71.8 | 69.5 |
LiveBench · Mathematics | 84.9 | 79.6 |
LiveBench · Overall | 70.2 | 68.6 |
LiveBench · Reasoning | 72.5 | 82.0 |
Pricing · per 1M tokens · projected $/mo at 10M tokens
| Model | Input | Output | Context | Projected $/mo |
|---|---|---|---|---|
| GLM 5.1 | $0.95 | $3.15 | 203K tokens (~101 books) | $15.00 |
| GPT-5.1-Codex | $1.25 | $10.00 | 400K tokens (~200 books) | $34.38 |