Data points: 102
Model compare
The readout for GLM-5.1 and GPT-4o, 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 88 to 12.
Evidence depth
102 data points
Includes 18 benchmark rows, 0 audit samples, and 10 provider examples.
Selection signal
Start with GLM-5.1
The charts below split 28 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-4o: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.
| Model compare | GLM-5.1 | GPT-4o |
|---|---|---|
| Overall leader | Leading | Contender |
| Weighted overall score | 88.0 pts | 12.0 pts |
| Benchmark category leads | 6 categories | 0 categories |
| Operational advantages | Cheapest input price, Provider coverage | Average speed, First-token latency, Free providers |
| Context window | 204.8K tokens | 128K tokens |
| Max output | 128K 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-5.1 | GPT-4o |
|---|---|---|
| Developer | Z.ai | OpenAI |
| Released | Apr 2026 | Nov 2024 |
| Parameters | No data | No data |
| Tokenizer | Other | GPT |
| Knowledge cutoff | No data | 2023-10-31 |
| OpenRouter ID | z-ai/glm-5.1 | openai/gpt-4o |
| References | No data | No data |
This report only uses LMSpeed data for GLM-5.1 and GPT-4o: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.
GLM-5.1
GLM-5.1 is stronger in benchmark categories (Agents, Coding, Reasoning, Knowledge, Math) and operational dimensions (Cheapest input price, Provider coverage).
GPT-4o
GPT-4o has these operational advantages: Average speed, 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
54.4
Avg. score
GPT-4o
43.2
GLM-5.1 leads by 15.0
GLM-5.1 leads by 8.4
GLM-5.1 leads by 13.7
GLM-5.1 leads by 6.6
GLM-5.1 leads by 9.5
No data
No data
GLM-5.1 leads by 13.8
Metric-level scores with benchmark source, rank depth, confidence, error, and evaluation date where available.
GLM-5.1
winner63.0
Rank #25/84 · confidence 2 · eval date 2026-04-07
GPT-4o
43.0
Rank #76/84 · confidence 1 · eval date 2024-05-13
GLM-5.1
winner$4.40/M
Rank #97/162 · confidence 4
GPT-4o
$10.00/M
Rank #120/162 · confidence 4
GLM-5.1
winner$2.14/M
Rank #103/162 · confidence 4
GPT-4o
$4.38/M
Rank #127/162 · confidence 4
GLM-5.1
winner$1.39/M
Rank #116/162 · confidence 4
GPT-4o
$2.50/M
Rank #131/162 · confidence 4
GLM-5.1
winner86.8%
Rank #35/188 · confidence 4
GPT-4o
54.3%
Rank #156/188 · confidence 4
GLM-5.1
winner28.0%
Rank #35/187 · confidence 4
GPT-4o
3.3%
Rank #180/187 · confidence 4
GLM-5.1
winner43.8%
Rank #39/185 · confidence 4
GPT-4o
33.3%
Rank #120/185 · confidence 4
GLM-5.1
winner43.8
Rank #42/96 · confidence 2 · eval date 2026-04-07
GPT-4o
33.3
Rank #80/96 · confidence 1 · eval date 2024-05-13
GLM-5.1
winner33.4
Rank #17/47 · confidence 2 · eval date 2026-04-07
GPT-4o
0.3
Rank #47/47 · confidence 1 · eval date 2024-05-13
GLM-5.1
winner64.6
Rank #18/56 · confidence 2 · eval date 2026-04-07
GPT-4o
25.4
Rank #54/56 · confidence 1 · eval date 2024-05-13
GLM-5.1
winner40.2
Rank #28/99 · confidence 2 · eval date 2026-04-07
GPT-4o
11.2
Rank #90/99 · confidence 1 · eval date 2024-05-13
GLM-5.1
winner28.0
Rank #35/96 · confidence 2 · eval date 2026-04-07
GPT-4o
3.3
Rank #94/96 · confidence 1 · eval date 2024-05-13
GLM-5.1
winner86.8
Rank #38/96 · confidence 2 · eval date 2026-04-07
GPT-4o
54.3
Rank #91/96 · confidence 1 · eval date 2024-05-13
GLM-5.1
winner24.2
Rank #62/90 · confidence 2 · eval date 2026-04-07
GPT-4o
19.7
Rank #75/90 · confidence 1 · eval date 2024-05-13
GLM-5.1
29.4
Rank #83/90 · confidence 2 · eval date 2026-04-07
GPT-4o
winner37.9
Rank #75/90 · confidence 1 · eval date 2024-05-13
GLM-5.1
winner1305.0
Rank #11/66 · confidence 2 · eval date 2026-04-07
GPT-4o
861.0
Rank #65/66 · confidence 1 · eval date 2024-05-13
GLM-5.1
winner76.3
Rank #13/86 · confidence 2 · eval date 2026-04-07
GPT-4o
34.3
Rank #82/86 · confidence 1 · eval date 2024-05-13
GLM-5.1
winner97.7
Rank #7/84 · confidence 2 · eval date 2026-04-07
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-5.1 | 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-5.1 | GPT-4o |
|---|---|---|
20 tests | GLM-5.1 speed / latency 54 tok/s / 12475ms input / output No data | GPT-4o speed / latency 57 tok/s / 3381ms input / output No data |
15 tests | GLM-5.1 speed / latency 58 tok/s / 14051ms input / output No data | GPT-4o 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-4o speed / latency N/A / N/A input / output No data |
5 tests | GLM-5.1 speed / latency 46 tok/s / 10246ms input / output No data | GPT-4o speed / latency N/A / N/A input / output No data |
5 tests | GLM-5.1 speed / latency N/A / N/A input / output No data | GPT-4o speed / latency 48 tok/s / 13138ms input / output No data |
GLM-5.1 glm-5.1 speed / latency No data input / output $0/M/$0/M | GPT-4o gpt-4o speed / latency No data input / output $0/M | |
GLM-5.1 glm-5.1 speed / latency No data input / output $0/M/$0/M | GPT-4o gpt-4o speed / latency No data input / output $0.171/M | |
GLM-5.1 glm-5.1 speed / latency No data input / output $37.50/M/$37.50/M | GPT-4o gpt-4o speed / latency No data input / output $0.025/M | |
GLM-5.1 glm-5.1 speed / latency No data input / output $0.050/request | GPT-4o gpt-4o speed / latency No data input / output $0.100/request | |
GLM-5.1 GLM-5.1 speed / latency No data input / output $0.080/request | GPT-4o gpt-4o-2024-05-13 speed / latency No data input / output $10.00/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 inputImage inputFile inputText outputTool callingStructured outputsJSON modeWeb search |
|---|
