Data points: 127
Model compare
The readout for GLM-5.1 and GPT-5.1, 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
127 data points
Includes 31 benchmark rows, 0 audit samples, and 9 provider examples.
Selection signal
Start with GLM-5.1
The charts below split 40 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-5.1: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.
| Model compare | GLM-5.1 | GPT-5.1 |
|---|---|---|
| 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 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-5.1 | GPT-5.1 |
|---|---|---|
| Developer | Z.ai | OpenAI |
| Released | Apr 2026 | Nov 2025 |
| Parameters | No data | No data |
| Tokenizer | Other | GPT |
| Knowledge cutoff | No data | No data |
| OpenRouter ID | z-ai/glm-5.1 | openai/gpt-5.1 |
| References | No data | No data |
This report only uses LMSpeed data for GLM-5.1 and GPT-5.1: 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-5.1
GPT-5.1 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
54.6
Avg. score
GPT-5.1
52.1
GLM-5.1 leads by 6.1
GLM-5.1 leads by 5.6
GLM-5.1 leads by 1.5
GLM-5.1 leads by 2.9
GPT-5.1 leads by 2.3
No data
No data
GLM-5.1 leads by 1.4
Metric-level scores with benchmark source, rank depth, confidence, error, and evaluation date where available.
GLM-5.1
winner64.0
Rank #24/83 · confidence 2 · eval date 2026-04-07
GPT-5.1
56.0
Rank #44/83 · confidence 1 · eval date 2025-11-13
GLM-5.1
winner0.85 s
Rank #46/136 · confidence 4
GPT-5.1
35.90 s
Rank #128/136 · confidence 4
GLM-5.1
87.6 tok/s
Rank #76/136 · confidence 4
GPT-5.1
winner111.6 tok/s
Rank #60/136 · confidence 4
GLM-5.1
44.13 s
Rank #119/136 · confidence 4
GPT-5.1
winner35.90 s
Rank #113/136 · confidence 4
GLM-5.1
winner$4.40/M
Rank #98/162 · confidence 4
GPT-5.1
$10.00/M
Rank #121/162 · confidence 4
GLM-5.1
winner$2.15/M
Rank #104/162 · confidence 4
GPT-5.1
$3.44/M
Rank #118/162 · confidence 4
GLM-5.1
$1.40/M
Rank #117/162 · confidence 4
GPT-5.1
winner$1.25/M
Rank #108/162 · confidence 4
GLM-5.1
62.3
Rank #55/89 · confidence 2 · eval date 2026-04-07
GPT-5.1
winner75.0
Rank #3/89 · confidence 1 · eval date 2025-11-13
GLM-5.1
86.8%
Rank #34/187 · confidence 4
GPT-5.1
winner87.3%
Rank #32/187 · confidence 4
GLM-5.1
4.6
Rank #37/73 · confidence 2 · eval date 2026-04-07
GPT-5.1
winner4.9
Rank #34/73 · confidence 1 · eval date 2025-11-13
GLM-5.1
winner28.0%
Rank #34/186 · confidence 4
GPT-5.1
26.5%
Rank #39/186 · confidence 4
GLM-5.1
winner31.5
Rank #14/33 · confidence 2 · eval date 2026-04-07
GPT-5.1
24.6
Rank #18/33 · confidence 1 · eval date 2025-11-13
GLM-5.1
winner55.8
Rank #26/58 · confidence 2 · eval date 2026-04-07
GPT-5.1
49.4
Rank #32/58 · confidence 1 · eval date 2025-11-13
GLM-5.1
winner43.8%
Rank #38/184 · confidence 4
GPT-5.1
43.3%
Rank #41/184 · confidence 4
GLM-5.1
winner43.8
Rank #42/96 · confidence 2 · eval date 2026-04-07
GPT-5.1
43.3
Rank #45/96 · confidence 1 · eval date 2025-11-13
GLM-5.1
12.5
Rank #16/35 · confidence 2 · eval date 2026-04-07
GPT-5.1
12.5
Rank #16/35 · confidence 1 · eval date 2025-11-13
GLM-5.1
winner33.4
Rank #17/47 · confidence 2 · eval date 2026-04-07
GPT-5.1
31.0
Rank #19/47 · confidence 1 · eval date 2025-11-13
GLM-5.1
winner64.6
Rank #18/56 · confidence 2 · eval date 2026-04-07
GPT-5.1
49.9
Rank #30/56 · confidence 1 · eval date 2025-11-13
GLM-5.1
1.9
Rank #27/29 · confidence 2 · eval date 2026-04-07
GPT-5.1
winner5.6
Rank #19/29 · confidence 1 · eval date 2025-11-13
GLM-5.1
winner40.2
Rank #27/99 · confidence 2 · eval date 2026-04-07
GPT-5.1
36.9
Rank #42/99 · confidence 1 · eval date 2025-11-13
GLM-5.1
24.2
Rank #62/90 · confidence 2 · eval date 2026-04-07
GPT-5.1
winner37.6
Rank #31/90 · confidence 1 · eval date 2025-11-13
GLM-5.1
winner28.0
Rank #35/96 · confidence 2 · eval date 2026-04-07
GPT-5.1
26.5
Rank #39/96 · confidence 1 · eval date 2025-11-13
GLM-5.1
86.8
Rank #38/96 · confidence 2 · eval date 2026-04-07
GPT-5.1
winner87.3
Rank #36/96 · confidence 1 · eval date 2025-11-13
GLM-5.1
29.4
Rank #83/90 · confidence 2 · eval date 2026-04-07
GPT-5.1
winner51.3
Rank #66/90 · confidence 1 · eval date 2025-11-13
GLM-5.1
winner1309.0
Rank #9/65 · confidence 2 · eval date 2026-04-07
GPT-5.1
1220.0
Rank #37/65 · confidence 1 · eval date 2025-11-13
GLM-5.1
winner76.3
Rank #13/86 · confidence 2 · eval date 2026-04-07
GPT-5.1
72.9
Rank #30/86 · confidence 1 · eval date 2025-11-13
GLM-5.1
winner97.7
Rank #7/84 · confidence 2 · eval date 2026-04-07
GPT-5.1
81.9
Rank #52/84 · confidence 1 · eval date 2025-11-13
GLM-5.1
winner60.1
Rank #12/50 · confidence 2 · eval date 2026-04-07
GPT-5.1
41.2
Rank #35/50 · confidence 1 · eval date 2025-11-13
GLM-5.1
winner37.8
Rank #17/50 · confidence 2 · eval date 2026-04-07
GPT-5.1
24.4
Rank #35/50 · confidence 1 · eval date 2025-11-13
GLM-5.1
winner1257.0
Rank #17/54 · confidence 2 · eval date 2026-04-07
GPT-5.1
987.0
Rank #35/54 · confidence 1 · eval date 2025-11-13
GLM-5.1
winner29.9
Rank #21/54 · confidence 2 · eval date 2026-04-07
GPT-5.1
21.0
Rank #36/54 · 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-5.1 | 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-5.1 | GPT-5.1 |
|---|---|---|
15 tests | GLM-5.1 speed / latency 58 tok/s / 14051ms input / output No data | GPT-5.1 speed / latency N/A / N/A input / output No data |
10 tests | GLM-5.1 speed / latency 54 tok/s / 12475ms input / output No data | GPT-5.1 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-5.1 speed / latency N/A / N/A input / output No data |
5 tests | GLM-5.1 speed / latency 148 tok/s / 5296ms input / output No data | GPT-5.1 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-5.1 speed / latency N/A / N/A input / output No data |
GLM-5.1 glm-5.1 speed / latency No data input / output $0/M/$0/M | GPT-5.1 gpt-5.1 speed / latency No data input / output $0.086/M | |
GLM-5.1 GLM-5.1 speed / latency No data input / output $0.0027/request | GPT-5.1 gpt-5.1 speed / latency No data input / output $0.103/M | |
GLM-5.1 glm-5.1 speed / latency No data input / output $0.010/request | GPT-5.1 gpt-5.1-chat-2025-11-13 speed / latency No data input / output $0.050/request | |
GLM-5.1 glm-5.1 speed / latency No data input / output $0.100/request | GPT-5.1 gpt-5-1 speed / latency No data input / output $0.040/request |
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 |
|---|
