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
#16 by perf·no signal
Step 3.5 Flash
#9 by perf·#11 by attention
Best value
Step 3.5 Flash
12.5x better value than GLM 5.1
GLM 5.1
30.9 pts/$
$2.27/M
Step 3.5 Flash
384.5 pts/$
$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
Artificial Analysis Agentic Index · a composite score measuring how well a model performs in agentic workflows · multi-step tool use, planning, error recovery, and autonomous task completion. Aggregates results from multiple agentic benchmarks including SWE-bench, tool-use tests, and planning evaluations. The canonical single-number metric for "how good is this model as an agent?"
GLM 5.1
67.0
Step 3.5 Flash
52.0
Artificial Analysis · Coding Index
GLM 5.1 leads by +11.7
Artificial Analysis Coding Index · a composite score that aggregates performance across multiple coding benchmarks into a single index. Tracks code generation quality, debugging ability, multi-language competence, and real-world software engineering tasks. Used by Artificial Analysis to rank model coding capability in a normalized, comparable format. Useful for developers choosing between models for coding-heavy workloads.
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 Artificial Analysis Agentic Index · a composite score measuring how well a model performs in agentic workflows · multi-step tool use, planning, error recovery, and autonomous task completion. Aggregates results from multiple agentic benchmarks including SWE-bench, tool-use tests, and planning evaluations. The canonical single-number metric for "how good is this model as an agent?" | 67.0 | 52.0 |
Artificial Analysis · Coding Index Artificial Analysis Coding Index · a composite score that aggregates performance across multiple coding benchmarks into a single index. Tracks code generation quality, debugging ability, multi-language competence, and real-world software engineering tasks. Used by Artificial Analysis to rank model coding capability in a normalized, comparable format. Useful for developers choosing between models for coding-heavy workloads. | 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 |
|---|---|---|---|---|
| $1.05 | $3.50 | 203K tokens (~101 books) | $16.63 | |
| $0.10 | $0.30 | 262K tokens (~131 books) | $1.50 |