Data points: 78
Model compare
The readout for GLM-4.5 and GPT-5.1, before the detailed comparison sheet.
Weighted outcome: GLM-4.5. Benchmark capability categories carry 80%, while price, API performance, and availability carry 20%.
Decision read
GLM-4.5
GLM-4.5 has the higher weighted result; Model A / B score 80 to 20.
Evidence depth
78 data points
Includes 6 benchmark rows, 0 audit samples, and 9 provider examples.
Selection signal
Start with GLM-4.5
The charts below split 15 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-4.5 and GPT-5.1: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.
| Model compare | GLM-4.5 | GPT-5.1 |
|---|---|---|
| Overall leader | Leading | Contender |
| Weighted overall score | 80.0 pts | 20.0 pts |
| Benchmark category leads | 3 categories | 0 categories |
| Operational advantages | No data | Cheapest input price, Average speed, First-token latency, Free providers, Provider coverage |
| Context window | 131.1K tokens | 400K tokens |
| Max output | 98.3K tokens | 128K tokens |
| Modalities | Input Text Output Text | Input Image |
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-4.5 | GPT-5.1 |
|---|---|---|
| Developer | Z.ai | OpenAI |
| Released | Jul 2025 | Nov 2025 |
| Parameters | No data | No data |
| Tokenizer | Other | GPT |
| Knowledge cutoff | 2024-12-31 | No data |
| OpenRouter ID | z-ai/glm-4.5 | openai/gpt-5.1 |
| References | No data | No data |
This report only uses LMSpeed data for GLM-4.5 and GPT-5.1: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.
GLM-4.5
GLM-4.5 leads these benchmark categories: Coding, Reasoning, Math.
GPT-5.1
GPT-5.1 has these operational advantages: Cheapest input price, Average speed, First-token latency, Free providers, Provider coverage.
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-4.5
55.1
Avg. score
GPT-5.1
52
GPT-5.1
GLM-4.5 leads by 2.3
GLM-4.5 leads by 0.3
GPT-5.1
GLM-4.5 leads by 6.7
No data
No data
GPT-5.1
Metric-level scores with benchmark source, rank depth, confidence, error, and evaluation date where available.
GLM-4.5
83.5%
Rank #38/125 · confidence 4
GPT-5.1
winner87.0%
Rank #12/125 · confidence 4
GLM-4.5
78.2%
Rank #82/188 · confidence 4
GPT-5.1
winner87.3%
Rank #33/188 · confidence 4
GLM-4.5
12.2%
Rank #86/187 · confidence 4
GPT-5.1
winner26.5%
Rank #40/187 · confidence 4
GLM-4.5
73.8%
Rank #24/115 · confidence 4
GPT-5.1
winner86.8%
Rank #4/115 · confidence 4
GLM-4.5
34.8%
Rank #113/185 · confidence 4
GPT-5.1
winner43.3%
Rank #42/185 · confidence 4
GLM-4.5
1200.0
Rank #44/66 · confidence 1 · eval date 2025-06-01
GPT-5.1
winner1217.0
Rank #39/66 · confidence 1 · eval date 2025-11-13
Latest completed audits from shared providers, with four safety and integrity score groups plus report links.
| Provider | GLM-4.5 | GPT-5.1 |
|---|---|---|
| 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-4.5 | GPT-5.1 |
|---|---|---|
5 tests | GLM-4.5 speed / latency N/A / N/A input / output No data | GPT-5.1 speed / latency 96 tok/s / 1862ms input / output No data |
0 tests | GLM-4.5 speed / latency N/A / N/A input / output No data | GPT-5.1 speed / latency N/A / N/A input / output No data |
0 tests | GLM-4.5 speed / latency N/A / N/A input / output No data | GPT-5.1 speed / latency N/A / N/A input / output No data |
0 tests | GLM-4.5 speed / latency N/A / N/A input / output No data | GPT-5.1 speed / latency N/A / N/A input / output No data |
0 tests | GLM-4.5 speed / latency N/A / N/A input / output No data | GPT-5.1 speed / latency N/A / N/A input / output No data |
GLM-4.5 glm-4.5 speed / latency No data input / output $0.041/M/$0.151/M | GPT-5.1 gpt-5.1 speed / latency No data input / output $0.086/M | |
GLM-4.5 glm-4.5 speed / latency No data input / output $0/request | GPT-5.1 gpt-5.1-chat-latest speed / latency No data input / output $0/request | |
GLM-4.5 glm-4.5 speed / latency No data input / output $0.066/M/$0.263/M | GPT-5.1 gpt-5.1-chat speed / latency No data input / output $0.856/M | |
GLM-4.5 glm-4.5 speed / latency No data input / output $0.066/M/$0.263/M | GPT-5.1 gpt-5.1-2025-11-13 speed / latency No data input / output $0.856/M |
Weighted outcome: GLM-4.5. Benchmark capability categories carry 80%, while price, API performance, and availability carry 20%.
Output
| Features | Text inputText outputTool callingJSON modeReasoning | Text inputImage inputFile inputText outputTool callingStructured outputsJSON modeReasoning |
|---|
