Data points: 115
Model compare
The readout for GLM-5.1 and GPT-5, 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 74.7 to 25.3.
Evidence depth
115 data points
Includes 22 benchmark rows, 1 audit samples, and 10 provider examples.
Selection signal
Start with GLM-5.1
The charts below split 33 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-5: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.
| Model compare | GLM-5.1 | GPT-5 |
|---|---|---|
| Overall leader | Leading | Contender |
| Weighted overall score | 74.7 pts | 25.3 pts |
| Benchmark category leads | 5 categories | 1 categories |
| Operational advantages | Cheapest input price, Provider coverage | Average speed, First-token latency, Free providers |
| Context window | 204.8K tokens | 400K tokens |
| Max output | 128K tokens | 128K 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-5 |
|---|---|---|
| Developer | Z.ai | OpenAI |
| Released | Apr 2026 | Aug 2025 |
| Parameters | No data | No data |
| Tokenizer | Other | GPT |
| Knowledge cutoff | No data | 2024-09-30 |
| OpenRouter ID | z-ai/glm-5.1 | openai/gpt-5 |
| References | No data | No data |
This report only uses LMSpeed data for GLM-5.1 and GPT-5: 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, Instruction following) and operational dimensions (Cheapest input price, Provider coverage).
GPT-5
GPT-5 is stronger in benchmark categories (Math) and operational dimensions (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-5
51.9
GLM-5.1 leads by 8.4
GLM-5.1 leads by 5.6
GLM-5.1 leads by 2.3
GLM-5.1 leads by 6.4
GPT-5 leads by 9.9
No data
No data
GLM-5.1 leads by 2.2
Metric-level scores with benchmark source, rank depth, confidence, error, and evaluation date where available.
GLM-5.1
winner$4.40/M
Rank #97/162 · confidence 4
GPT-5
$10.00/M
Rank #120/162 · confidence 4
GLM-5.1
winner$2.13/M
Rank #103/162 · confidence 4
GPT-5
$3.44/M
Rank #117/162 · confidence 4
GLM-5.1
$1.38/M
Rank #116/162 · confidence 4
GPT-5
winner$1.25/M
Rank #107/162 · confidence 4
GLM-5.1
62.3
Rank #55/89 · confidence 2 · eval date 2026-04-07
GPT-5
winner75.6
Rank #2/89 · confidence 1 · eval date 2025-08-07
GLM-5.1
4.6
Rank #37/73 · confidence 2 · eval date 2026-04-07
GPT-5
winner5.7
Rank #30/73 · confidence 1 · eval date 2025-08-07
GLM-5.1
winner86.8%
Rank #35/188 · confidence 4
GPT-5
67.3%
Rank #121/188 · confidence 4
GLM-5.1
winner28.0%
Rank #35/187 · confidence 4
GPT-5
5.4%
Rank #132/187 · confidence 4
GLM-5.1
winner31.5
Rank #14/33 · confidence 2 · eval date 2026-04-07
GPT-5
20.1
Rank #22/33 · confidence 1 · eval date 2025-08-07
GLM-5.1
winner55.8
Rank #27/59 · confidence 2 · eval date 2026-04-07
GPT-5
37.8
Rank #41/59 · confidence 1 · eval date 2025-08-07
GLM-5.1
winner43.8%
Rank #39/185 · confidence 4
GPT-5
38.8%
Rank #83/185 · confidence 4
GLM-5.1
winner43.8
Rank #42/96 · confidence 2 · eval date 2026-04-07
GPT-5
42.9
Rank #46/96 · confidence 1 · eval date 2025-08-07
GLM-5.1
24.2
Rank #62/90 · confidence 2 · eval date 2026-04-07
GPT-5
winner40.7
Rank #20/90 · confidence 1 · eval date 2025-08-07
GLM-5.1
winner40.2
Rank #28/99 · confidence 2 · eval date 2026-04-07
GPT-5
34.7
Rank #48/99 · confidence 1 · eval date 2025-08-07
GLM-5.1
29.4
Rank #83/90 · confidence 2 · eval date 2026-04-07
GPT-5
winner82.1
Rank #31/90 · confidence 1 · eval date 2025-08-07
GLM-5.1
winner28.0
Rank #35/96 · confidence 2 · eval date 2026-04-07
GPT-5
26.5
Rank #39/96 · confidence 1 · eval date 2025-08-07
GLM-5.1
winner86.8
Rank #38/96 · confidence 2 · eval date 2026-04-07
GPT-5
85.4
Rank #45/96 · confidence 1 · eval date 2025-08-07
GLM-5.1
winner1299.0
Rank #14/66 · confidence 2 · eval date 2026-04-07
GPT-5
1209.0
Rank #40/66 · confidence 1 · eval date 2025-08-07
GLM-5.1
winner76.3
Rank #13/86 · confidence 2 · eval date 2026-04-07
GPT-5
73.1
Rank #29/86 · confidence 1 · eval date 2025-08-07
GLM-5.1
winner97.7
Rank #7/84 · confidence 2 · eval date 2026-04-07
GPT-5
84.8
Rank #44/84 · confidence 1 · eval date 2025-08-07
GLM-5.1
winner37.8
Rank #18/50 · confidence 2 · eval date 2026-04-07
GPT-5
28.9
Rank #31/50 · confidence 1 · eval date 2025-08-07
GLM-5.1
winner1256.0
Rank #18/55 · confidence 2 · eval date 2026-04-07
GPT-5
1079.0
Rank #31/55 · confidence 1 · eval date 2025-08-07
GLM-5.1
winner29.9
Rank #22/55 · confidence 2 · eval date 2026-04-07
GPT-5
25.7
Rank #28/55 · confidence 1 · eval date 2025-08-07
Latest completed audits from shared providers, with four safety and integrity score groups plus report links.
| Provider | GLM-5.1 | GPT-5 |
|---|---|---|
Winner: GLM-5.1 | GLM-5.1 z-ai/glm-5.1 Audit score 78 70728088 | GPT-5 gpt-5 No audit yet |
Speed aggregates and input/output pricing share each provider row for real API selection and migration cost checks.
| Provider | GLM-5.1 | GPT-5 |
|---|---|---|
20 tests | GLM-5.1 speed / latency N/A / N/A input / output No data | GPT-5 speed / latency 95 tok/s / 1234ms input / output No data |
15 tests | GLM-5.1 speed / latency 54 tok/s / 12475ms input / output No data | GPT-5 speed / latency 45 tok/s / 3704ms input / output No data |
15 tests | GLM-5.1 speed / latency 58 tok/s / 14051ms input / output No data | GPT-5 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-5 speed / latency N/A / N/A input / output No data |
10 tests | GLM-5.1 speed / latency 22 tok/s / 9579ms input / output No data | GPT-5 speed / latency 38 tok/s / 15844ms input / output No data |
GLM-5.1 glm-5.1 speed / latency No data input / output $0/M/$0/M | GPT-5 gpt-5 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-5 gpt-5 speed / latency No data input / output $0.086/M | |
GLM-5.1 z-ai/glm-5.1 speed / latency No data input / output $0.017/M/$0.054/M | GPT-5 gpt-5 speed / latency No data input / output $0.856/M | |
GLM-5.1 glm-5.1 speed / latency No data input / output $0.050/request | GPT-5 gpt-5 speed / latency No data input / output $8.00/M | |
GLM-5.1 GLM-5.1 speed / latency No data input / output $0.080/request | GPT-5 gpt-5 speed / latency No data input / output $2.50/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 modeReasoning |
|---|
