Data points: 105
Model compare
The readout for GLM-4.5 Air and GPT-4o, before the detailed comparison sheet.
Weighted outcome: GLM-4.5 Air. Benchmark capability categories carry 80%, while price, API performance, and availability carry 20%.
Decision read
GLM-4.5 Air
GLM-4.5 Air has the higher weighted result; Model A / B score 70.7 to 29.3.
Evidence depth
105 data points
Includes 19 benchmark rows, 0 audit samples, and 8 provider examples.
Selection signal
Start with GLM-4.5 Air
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-4o: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.
| Model compare | GLM-4.5 Air | GPT-4o |
|---|---|---|
| Overall leader | Leading | Contender |
| Weighted overall score | 70.7 pts | 29.3 pts |
| Benchmark category leads | 5 categories | 1 categories |
| Operational advantages | Cheapest input price | Average speed, First-token latency, Free providers, Provider coverage |
| Context window | 131.1K tokens | 128K tokens |
| Max output | 98.3K tokens | 16.4K 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-4.5 Air | GPT-4o |
|---|---|---|
| Developer | Z.ai | OpenAI |
| Released | Jul 2025 | Nov 2024 |
| Parameters | No data | No data |
| Tokenizer | Other | GPT |
| Knowledge cutoff | 2024-12-31 | 2023-10-31 |
| OpenRouter ID | z-ai/glm-4.5-air | openai/gpt-4o |
| References | No data | No data |
This report only uses LMSpeed data for GLM-4.5 Air and GPT-4o: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.
GLM-4.5 Air
GLM-4.5 Air is stronger in benchmark categories (Agents, Coding, Reasoning, Math, Instruction following) and operational dimensions (Cheapest input price).
GPT-4o
GPT-4o is stronger in benchmark categories (Knowledge) and operational dimensions (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-4o
43.2
GLM-4.5 Air leads by 4.1
GLM-4.5 Air leads by 2.1
GLM-4.5 Air leads by 7.1
GPT-4o leads by 13.1
GLM-4.5 Air leads by 14.8
No data
No data
GLM-4.5 Air leads by 1.1
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-4o
$2.50/M
Rank #131/162 · confidence 4
GLM-4.5 Air
winner$0.372/M
Rank #31/162 · confidence 4
GPT-4o
$4.38/M
Rank #127/162 · confidence 4
GLM-4.5 Air
winner$0.980/M
Rank #39/162 · confidence 4
GPT-4o
$10.00/M
Rank #120/162 · confidence 4
GLM-4.5 Air
winner81.5%
Rank #53/125 · confidence 4
GPT-4o
74.8%
Rank #90/125 · confidence 4
GLM-4.5 Air
winner73.3%
Rank #106/188 · confidence 4
GPT-4o
54.3%
Rank #156/188 · confidence 4
GLM-4.5 Air
winner6.8%
Rank #116/187 · confidence 4
GPT-4o
3.3%
Rank #180/187 · confidence 4
GLM-4.5 Air
winner68.4%
Rank #32/115 · confidence 4
GPT-4o
30.9%
Rank #88/115 · confidence 4
GLM-4.5 Air
30.6
Rank #85/96 · confidence 1 · eval date 2025-06-01
GPT-4o
winner33.3
Rank #80/96 · confidence 1 · eval date 2024-05-13
GLM-4.5 Air
30.6%
Rank #136/185 · confidence 4
GPT-4o
winner33.3%
Rank #120/185 · confidence 4
GLM-4.5 Air
winner96.5%
Rank #16/74 · confidence 4
GPT-4o
75.9%
Rank #56/74 · confidence 4
GLM-4.5 Air
winner67.3%
Rank #23/68 · confidence 4
GPT-4o
15.0%
Rank #50/68 · confidence 4
GLM-4.5 Air
winner92.3
Rank #7/90 · confidence 1 · eval date 2025-06-01
GPT-4o
37.9
Rank #75/90 · confidence 1 · eval date 2024-05-13
GLM-4.5 Air
winner73.3
Rank #74/96 · confidence 1 · eval date 2025-06-01
GPT-4o
54.3
Rank #91/96 · confidence 1 · eval date 2024-05-13
GLM-4.5 Air
winner6.8
Rank #75/96 · confidence 1 · eval date 2025-06-01
GPT-4o
3.3
Rank #94/96 · confidence 1 · eval date 2024-05-13
GLM-4.5 Air
15.5
Rank #82/90 · confidence 1 · eval date 2025-06-01
GPT-4o
winner19.7
Rank #75/90 · confidence 1 · eval date 2024-05-13
GLM-4.5 Air
winner16.5
Rank #80/99 · confidence 1 · eval date 2025-06-01
GPT-4o
11.2
Rank #90/99 · confidence 1 · eval date 2024-05-13
GLM-4.5 Air
winner1171.0
Rank #48/66 · confidence 1 · eval date 2025-06-01
GPT-4o
856.0
Rank #65/66 · confidence 1 · eval date 2024-05-13
GLM-4.5 Air
winner37.6
Rank #77/86 · confidence 1 · eval date 2025-06-01
GPT-4o
34.3
Rank #82/86 · confidence 1 · eval date 2024-05-13
GLM-4.5 Air
winner46.5
Rank #69/84 · confidence 1 · eval date 2025-06-01
GPT-4o
25.1
Rank #75/84 · confidence 1 · eval date 2024-05-13
Latest completed audits from shared providers, with four safety and integrity score groups plus report links.
| Provider | GLM-4.5 Air | GPT-4o |
|---|---|---|
| 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-4o |
|---|---|---|
20 tests | GLM-4.5 Air speed / latency 44 tok/s / 5347ms input / output No data | GPT-4o speed / latency 99 tok/s / 2367ms input / output No data |
20 tests | GLM-4.5 Air speed / latency N/A / N/A input / output No data | GPT-4o speed / latency 88 tok/s / 1593ms input / output No data |
10 tests | GLM-4.5 Air speed / latency 20 tok/s / 33054ms input / output No data | GPT-4o 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-4o speed / latency 48 tok/s / 13138ms input / output No data |
5 tests | GLM-4.5 Air glm-4.5-air speed / latency N/A / N/A input / output $0.033/M/$0.247/M | GPT-4o gpt-4o-2024-05-13 speed / latency 58 tok/s / 2583ms input / output $3.42/M |
GLM-4.5 Air glm-4.5-air speed / latency No data input / output $0.014/M/$0.075/M | GPT-4o gpt-4o speed / latency No data input / output $0.171/M | |
GLM-4.5 Air glm-4.5-air speed / latency No data input / output $0/request | GPT-4o gpt-4o speed / latency No data input / output $0/request | |
GLM-4.5 Air glm-4.5-air speed / latency No data input / output $0.033/M/$0.247/M | GPT-4o gpt-4o speed / latency No data input / output $1.71/M |
Weighted outcome: GLM-4.5 Air. 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 modeWeb search |
|---|
