Data points: 78
Model compare
The readout for GLM-5.1 and GPT-4, before the detailed comparison sheet.
Weighted outcome: GLM-5.1. Benchmark capability categories carry 80%, while price, API performance, and availability carry 20%.
Decision read
GLM-5.1
GLM-5.1 has the higher weighted result; Model A / B score 92 to 8.
Evidence depth
78 data points
Includes 6 benchmark rows, 0 audit samples, and 7 provider examples.
Selection signal
Start with GLM-5.1
The charts below split 13 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 GPT-4: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.
| Model compare | GLM-5.1 | GPT-4 |
|---|---|---|
| Overall leader | Leading | Contender |
| Weighted overall score | 92.0 pts | 8.0 pts |
| Benchmark category leads | 1 categories | 0 categories |
| Operational advantages | Cheapest input price, Average speed, Provider coverage | First-token latency, Free providers |
| Context window | 204.8K tokens | 8.2K tokens |
| Max output | 128K tokens | 4.1K 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 | GPT-4 |
|---|---|---|
| Developer | Z.ai | OpenAI |
| Released | Apr 2026 | May 2023 |
| Parameters | No data | No data |
| Tokenizer | Other | GPT |
| Knowledge cutoff | No data | 2021-09-30 |
| OpenRouter ID | z-ai/glm-5.1 | openai/gpt-4 |
| References | No data | No data |
This report only uses LMSpeed data for GLM-5.1 and GPT-4: 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 (Cheapest input price, Average speed, Provider coverage).
GPT-4
GPT-4 has these operational advantages: First-token latency, Free providers.
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
GPT-4
49.5
GLM-5.1
GLM-5.1 leads by 5.5
GLM-5.1
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
44.13 s
Rank #119/136 · confidence 4
GPT-4
winner1.02 s
Rank #41/136 · confidence 4
GLM-5.1
winner0.85 s
Rank #46/136 · confidence 4
GPT-4
1.02 s
Rank #67/136 · confidence 4
GLM-5.1
winner87.6 tok/s
Rank #76/136 · confidence 4
GPT-4
43.6 tok/s
Rank #127/136 · confidence 4
GLM-5.1
winner$4.40/M
Rank #98/162 · confidence 4
GPT-4
$60.00/M
Rank #155/162 · confidence 4
GLM-5.1
winner$2.15/M
Rank #104/162 · confidence 4
GPT-4
$37.50/M
Rank #160/162 · confidence 4
GLM-5.1
winner$1.40/M
Rank #117/162 · confidence 4
GPT-4
$30.00/M
Rank #160/162 · confidence 4
Latest completed audits from shared providers, with four safety and integrity score groups plus report links.
| Provider | GLM-5.1 | GPT-4 |
|---|---|---|
| No completed audits are available from shared providers yet. | ||
Speed aggregates and input/output pricing share each provider row for real API selection and migration cost checks.
| Provider | GLM-5.1 | GPT-4 |
|---|---|---|
15 tests | GLM-5.1 speed / latency 58 tok/s / 14051ms input / output No data | GPT-4 speed / latency N/A / N/A input / output No data |
10 tests | GLM-5.1 speed / latency 42 tok/s / 15344ms input / output No data | GPT-4 speed / latency N/A / N/A input / output No data |
5 tests | GLM-5.1 speed / latency 41 tok/s / 12935ms input / output No data | GPT-4 speed / latency N/A / N/A input / output No data |
5 tests | GLM-5.1 speed / latency 37 tok/s / 20151ms input / output No data | GPT-4 speed / latency N/A / N/A input / output No data |
0 tests | GLM-5.1 speed / latency N/A / N/A input / output No data | GPT-4 speed / latency N/A / N/A input / output No data |
GLM-5.1 glm-5.1 speed / latency No data input / output $0.096/M/$0.301/M | GPT-4 gpt-4 speed / latency No data input / output $2.05/M | |
GLM-5.1 glm-5.1 speed / latency No data input / output $0.192/M/$0.603/M | GPT-4 gpt-4-32k-0613 speed / latency No data input / output $8.22/M |
Weighted outcome: GLM-5.1. Benchmark capability categories carry 80%, while price, API performance, and availability carry 20%.
Output
| Features | Text inputText outputTool callingStructured outputsJSON modeReasoning | Text inputText outputTool callingStructured outputsJSON mode |
|---|
