Data points: 102
Model compare
The readout for GLM-4.5 Air and GPT-5.1, before the detailed comparison sheet.
Weighted outcome: GPT-5.1. Benchmark capability categories carry 80%, while price, API performance, and availability carry 20%.
Decision read
GPT-5.1
GPT-5.1 has the higher weighted result; Model A / B score 13.3 to 86.7.
Evidence depth
102 data points
Includes 18 benchmark rows, 0 audit samples, and 9 provider examples.
Selection signal
Start with GPT-5.1
The charts below split 27 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 Air and GPT-5.1: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.
| Model compare | GLM-4.5 Air | GPT-5.1 |
|---|---|---|
| Overall leader | Contender | Leading |
| Weighted overall score | 13.3 pts | 86.7 pts |
| Benchmark category leads | 1 categories | 5 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 Air | 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-air | openai/gpt-5.1 |
| References | No data | No data |
This report only uses LMSpeed data for GLM-4.5 Air and GPT-5.1: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.
GLM-4.5 Air
GLM-4.5 Air leads these benchmark categories: Math.
GPT-5.1
GPT-5.1 is stronger in benchmark categories (Agents, Coding, Reasoning, Knowledge, Instruction following) and operational dimensions (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 Air
45.9
Avg. score
GPT-5.1
52
GPT-5.1 leads by 5.0
GPT-5.1 leads by 0.8
GPT-5.1 leads by 5.1
GPT-5.1 leads by 17.3
GLM-4.5 Air leads by 3.0
No data
No data
GPT-5.1 leads by 11.3
Metric-level scores with benchmark source, rank depth, confidence, error, and evaluation date where available.
GLM-4.5 Air
winner$0.170/M
Rank #23/162 · confidence 4
GPT-5.1
$1.25/M
Rank #107/162 · confidence 4
GLM-4.5 Air
winner$0.372/M
Rank #31/162 · confidence 4
GPT-5.1
$3.44/M
Rank #117/162 · confidence 4
GLM-4.5 Air
winner$0.980/M
Rank #39/162 · confidence 4
GPT-5.1
$10.00/M
Rank #120/162 · confidence 4
GLM-4.5 Air
43.7
Rank #74/89 · confidence 1 · eval date 2025-06-01
GPT-5.1
winner75.0
Rank #3/89 · confidence 1 · eval date 2025-11-13
GLM-4.5 Air
81.5%
Rank #53/125 · confidence 4
GPT-5.1
winner87.0%
Rank #12/125 · confidence 4
GLM-4.5 Air
73.3%
Rank #106/188 · confidence 4
GPT-5.1
winner87.3%
Rank #33/188 · confidence 4
GLM-4.5 Air
6.8%
Rank #116/187 · confidence 4
GPT-5.1
winner26.5%
Rank #40/187 · confidence 4
GLM-4.5 Air
68.4%
Rank #32/115 · confidence 4
GPT-5.1
winner86.8%
Rank #4/115 · confidence 4
GLM-4.5 Air
30.6%
Rank #136/185 · confidence 4
GPT-5.1
winner43.3%
Rank #42/185 · confidence 4
GLM-4.5 Air
30.6
Rank #85/96 · confidence 1 · eval date 2025-06-01
GPT-5.1
winner43.3
Rank #45/96 · confidence 1 · eval date 2025-11-13
GLM-4.5 Air
winner92.3
Rank #7/90 · confidence 1 · eval date 2025-06-01
GPT-5.1
51.3
Rank #65/90 · confidence 1 · eval date 2025-11-13
GLM-4.5 Air
15.5
Rank #82/90 · confidence 1 · eval date 2025-06-01
GPT-5.1
winner37.6
Rank #31/90 · confidence 1 · eval date 2025-11-13
GLM-4.5 Air
73.3
Rank #74/96 · confidence 1 · eval date 2025-06-01
GPT-5.1
winner87.3
Rank #36/96 · confidence 1 · eval date 2025-11-13
GLM-4.5 Air
6.8
Rank #75/96 · confidence 1 · eval date 2025-06-01
GPT-5.1
winner26.5
Rank #39/96 · confidence 1 · eval date 2025-11-13
GLM-4.5 Air
16.5
Rank #80/99 · confidence 1 · eval date 2025-06-01
GPT-5.1
winner36.9
Rank #42/99 · confidence 1 · eval date 2025-11-13
GLM-4.5 Air
1171.0
Rank #48/66 · confidence 1 · eval date 2025-06-01
GPT-5.1
winner1212.0
Rank #38/66 · confidence 1 · eval date 2025-11-13
GLM-4.5 Air
37.6
Rank #77/86 · confidence 1 · eval date 2025-06-01
GPT-5.1
winner72.9
Rank #30/86 · confidence 1 · eval date 2025-11-13
GLM-4.5 Air
46.5
Rank #69/84 · confidence 1 · eval date 2025-06-01
GPT-5.1
winner81.9
Rank #52/84 · 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 Air | 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 Air | GPT-5.1 |
|---|---|---|
10 tests | GLM-4.5 Air speed / latency 20 tok/s / 33054ms input / output No data | GPT-5.1 speed / latency N/A / N/A input / output No data |
10 tests | GLM-4.5 Air speed / latency 27 tok/s / 39365ms input / output No data | GPT-5.1 speed / latency N/A / N/A input / output No data |
5 tests | GLM-4.5 Air speed / latency N/A / N/A input / output No data | GPT-5.1 speed / latency 96 tok/s / 1862ms input / output No data |
5 tests | GLM-4.5 Air speed / latency 69 tok/s / 775ms input / output No data | GPT-5.1 speed / latency N/A / N/A input / output No data |
4 tests | GLM-4.5 Air speed / latency 78 tok/s / 18760ms input / output No data | GPT-5.1 speed / latency N/A / N/A input / output No data |
GLM-4.5 Air glm-4.5-air speed / latency No data input / output $0.014/M/$0.075/M | GPT-5.1 gpt-5.1 speed / latency No data input / output $0.086/M | |
GLM-4.5 Air glm-4.5-air speed / latency No data input / output $0/request | GPT-5.1 gpt-5.1-all speed / latency No data input / output $0/request | |
GLM-4.5 Air zai-org/GLM-4.5-Air speed / latency No data input / output $0.025/M/$0.140/M | GPT-5.1 gpt-5.1-2025-11-13 speed / latency No data input / output $2.14/M | |
GLM-4.5 Air glm-4.5-air speed / latency No data input / output $0.033/M/$0.247/M | GPT-5.1 gpt-5.1 speed / latency No data input / output $0.856/M |
Weighted outcome: GPT-5.1. Benchmark capability categories carry 80%, while price, API performance, and availability carry 20%.
Output
| Features | Text inputText outputTool callingReasoning | Text inputImage inputFile inputText outputTool callingStructured outputsJSON modeReasoning |
|---|
