Compare · ModelsLive · 2 picked · head to head
GLM 5.1 vs Step 3.5 Flash
Side by side · benchmarks, pricing, and signals you can act on.
Winner summary
GLM 5.1 wins on 4/4 benchmarks
GLM 5.1 wins 4 of 4 shared benchmarks. Leads in speed · arena.
Category leads
speed·GLM 5.1arena·GLM 5.1
Hype vs Reality
Attention vs performance
GLM 5.1
#14 by perf·no signal
Step 3.5 Flash
#7 by perf·#11 by attention
Best value
Step 3.5 Flash
11.2x better value than GLM 5.1
GLM 5.1
34.2 pts/$
$2.05/M
Step 3.5 Flash
384.5 pts/$
$0.20/M
Vendor risk
Mixed exposure
One or more vendors flagged
z-ai
private · undisclosed
StepFun
$5.0B·Tier 1
Head to head
4 benchmarks · 2 models
GLM 5.1Step 3.5 Flash
Artificial Analysis · Agentic Index
GLM 5.1 leads by +15.0
GLM 5.1
67.0
Step 3.5 Flash
52.0
Artificial Analysis · Coding Index
GLM 5.1 leads by +11.7
GLM 5.1
43.4
Step 3.5 Flash
31.6
Artificial Analysis · Quality Index
GLM 5.1 leads by +13.6
GLM 5.1
51.4
Step 3.5 Flash
37.8
Chatbot Arena Elo · Overall
GLM 5.1 leads by +76.0
GLM 5.1
1467.4
Step 3.5 Flash
1391.4
Full benchmark table
| Benchmark | GLM 5.1 | Step 3.5 Flash |
|---|---|---|
Artificial Analysis · Agentic Index | 67.0 | 52.0 |
Artificial Analysis · Coding Index | 43.4 | 31.6 |
Artificial Analysis · Quality Index | 51.4 | 37.8 |
Chatbot Arena Elo · Overall | 1467.4 | 1391.4 |
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 |
| Step 3.5 Flash | $0.10 | $0.30 | 262K tokens (~131 books) | $1.50 |