Compare · ModelsLive · 2 picked · head to head
GLM 5.1 vs GPT-5 Chat
Side by side · benchmarks, pricing, and signals you can act on.
Winner summary
GLM 5.1 wins on 1/1 benchmarks
GLM 5.1 wins 1 of 1 shared benchmarks. Leads in arena.
Category leads
arena·GLM 5.1
Hype vs Reality
Attention vs performance
GLM 5.1
#16 by perf·no signal
GPT-5 Chat
#3 by perf·#1 by attention
Best value
GLM 5.1
2.1x better value than GPT-5 Chat
GLM 5.1
30.9 pts/$
$2.27/M
GPT-5 Chat
14.6 pts/$
$5.63/M
Vendor risk
Who is behind the model
z-ai
private · undisclosed
OpenAI
$840.0B·Tier 1
Head to head
1 benchmark · 2 models
GLM 5.1GPT-5 Chat
Chatbot Arena Elo · Overall
GLM 5.1 leads by +41.4
GLM 5.1
1467.4
GPT-5 Chat
1426.0
Full benchmark table
| Benchmark | GLM 5.1 | GPT-5 Chat |
|---|---|---|
Chatbot Arena Elo · Overall | 1467.4 | 1426.0 |
Pricing · per 1M tokens · projected $/mo at 10M tokens
| Model | Input | Output | Context | Projected $/mo |
|---|---|---|---|---|
| $1.05 | $3.50 | 203K tokens (~101 books) | $16.63 | |
| $1.25 | $10.00 | 128K tokens (~64 books) | $34.38 |