Data points: 94
Model compare
The readout for GLM-5.1 and Step 3.5 Flash, before the detailed comparison sheet.
Weighted outcome: Step 3.5 Flash. Benchmark capability categories carry 80%, while price, API performance, and availability carry 20%.
Decision read
Step 3.5 Flash
Step 3.5 Flash has the higher weighted result; Model A / B score 46 to 54.
Evidence depth
94 data points
Includes 9 benchmark rows, 2 audit samples, and 9 provider examples.
Selection signal
Start with Step 3.5 Flash
The charts below split 20 high-signal samples across speed, scores, and audit health.
Switch either side of this report to compare another model with the same LMSpeed data pipeline.
Select a different model to open a new comparison URL.
This report only uses LMSpeed data for GLM-5.1 and Step 3.5 Flash: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.
| Model compare | GLM-5.1 | Step 3.5 Flash |
|---|---|---|
| Overall leader | Contender | Leading |
| Weighted overall score | 46.0 pts | 54.0 pts |
| Benchmark category leads | 1 categories | 1 categories |
| Operational advantages | Provider coverage | Cheapest input price, Average speed, First-token latency |
| Context window | 202.8K tokens | 262.1K tokens |
| Max output | 128K tokens | 65.5K tokens |
| Modalities | Input Text Output Text | Input Text |
The overall result weights benchmark capability categories at 80% and price, API speed/latency, and availability at 20%. Recent test volume does not affect the winner, and missing benchmark categories are excluded.
| Model compare | GLM-5.1 | Step 3.5 Flash |
|---|---|---|
| Developer | Z.ai | StepFun |
| Released | Apr 2026 | Jan 2026 |
| Parameters | No data | No data |
| Tokenizer | Other | Other |
| Knowledge cutoff | No data | No data |
| OpenRouter ID | z-ai/glm-5.1 | stepfun/step-3.5-flash |
| References | No data | No data |
This report only uses LMSpeed data for GLM-5.1 and Step 3.5 Flash: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.
GLM-5.1
GLM-5.1 is stronger in benchmark categories (Coding) and operational dimensions (Provider coverage).
Step 3.5 Flash
Step 3.5 Flash is stronger in benchmark categories (Reasoning) and operational dimensions (Cheapest input price, Average speed, First-token latency).
Third-party benchmark profile synced into LMSpeed; only metrics available for both models are shown.
Compare benchmark category scores on a 0-100 scale. Select a category to inspect the gap.
Avg. score
GLM-5.1
54.6
Avg. score
Step 3.5 Flash
54.1
GLM-5.1
GLM-5.1 leads by 1.7
Step 3.5 Flash leads by 0.6
GLM-5.1
GLM-5.1
No data
No data
GLM-5.1
Metric-level scores with benchmark source, rank depth, confidence, error, and evaluation date where available.
GLM-5.1
65.7 tok/s
Rank #88/139 · confidence 4
Step 3.5 Flash
winner261.8 tok/s
Rank #6/139 · confidence 4
GLM-5.1
0.93 s
Rank #48/139 · confidence 4
Step 3.5 Flash
winner0.76 s
Rank #37/139 · confidence 4
GLM-5.1
58.62 s
Rank #125/139 · confidence 4
Step 3.5 Flash
winner8.39 s
Rank #72/139 · confidence 4
GLM-5.1
$2.15/M
Rank #105/163 · confidence 4
Step 3.5 Flash
winner$0.150/M
Rank #7/163 · confidence 4
GLM-5.1
$1.40/M
Rank #118/163 · confidence 4
Step 3.5 Flash
winner$0.100/M
Rank #7/163 · confidence 4
GLM-5.1
$4.40/M
Rank #99/163 · confidence 4
Step 3.5 Flash
winner$0.300/M
Rank #8/163 · confidence 4
GLM-5.1
winner86.8%
Rank #34/187 · confidence 4
Step 3.5 Flash
82.6%
Rank #61/187 · confidence 4
GLM-5.1
winner28.0%
Rank #34/186 · confidence 4
Step 3.5 Flash
22.6%
Rank #47/186 · confidence 4
GLM-5.1
winner43.8%
Rank #38/184 · confidence 4
Step 3.5 Flash
38.5%
Rank #85/184 · confidence 4
Latest completed audits from shared providers, with four safety and integrity score groups plus report links.
| Provider | GLM-5.1 | Step 3.5 Flash |
|---|---|---|
Winner: GLM-5.1 | GLM-5.1 glm-5.1 Audit score 97 10010086100 | Step 3.5 Flash step-3.5-flash No audit yet |
Winner: GLM-5.1 | GLM-5.1 z-ai/glm-5.1 Audit score 78 70728088 | Step 3.5 Flash stepfun-ai/step-3.5-flash No audit yet |
Speed aggregates and input/output pricing share each provider row for real API selection and migration cost checks.
| Provider | GLM-5.1 | Step 3.5 Flash |
|---|---|---|
55 tests | GLM-5.1 speed / latency 58 tok/s / 14051ms input / output No data | Step 3.5 Flash speed / latency 100 tok/s / 6815ms input / output No data |
20 tests | GLM-5.1 speed / latency 82 tok/s / 9309ms input / output No data | Step 3.5 Flash speed / latency 82 tok/s / 4793ms input / output No data |
15 tests | GLM-5.1 speed / latency 50 tok/s / 9040ms input / output No data | Step 3.5 Flash speed / latency 84 tok/s / 3375ms input / output No data |
10 tests | GLM-5.1 speed / latency N/A / N/A input / output No data | Step 3.5 Flash speed / latency 176 tok/s / 6154ms input / output No data |
5 tests | GLM-5.1 speed / latency 148 tok/s / 5296ms input / output No data | Step 3.5 Flash speed / latency N/A / N/A input / output No data |
GLM-5.1 glm-5.1 speed / latency No data input / output $0.050/request | Step 3.5 Flash stepfun-ai/step-3.5-flash speed / latency No data input / output $0/request | |
GLM-5.1 glm-5.1 speed / latency No data input / output $0/M/$0/M | Step 3.5 Flash step-3.5-flash speed / latency No data input / output $0/M | |
GLM-5.1 glm-5.1 speed / latency No data input / output $0/M/$0/M | Step 3.5 Flash step-3.5-flash-2603 speed / latency No data input / output $75.00/M | |
GLM-5.1 glm-5.1 speed / latency No data input / output $0/M/$0/M | Step 3.5 Flash step-3.5-flash speed / latency No data input / output $0.0066/M |
Weighted outcome: Step 3.5 Flash. Benchmark capability categories carry 80%, while price, API performance, and availability carry 20%.
Output
| Features | Text inputText outputTool callingStructured outputsJSON modeReasoning | Text inputText outputTool callingReasoning |
|---|
