Data points: 82
The readout for GLM-5.1 and GPT-5.4, before the detailed comparison sheet.
Decision read
GPT-5.4
GPT-5.4 currently has the stronger profile, with verified wins split 2 to 4.
Evidence depth
82 data points
Includes 8 benchmark rows, 2 audit samples, and 10 provider examples.
Selection signal
Start with GPT-5.4
The charts below split 20 high-signal samples across speed, scores, and audit health.
Model compare GLM-5.1 vs GPT-5.4glm-5-1-vs-gpt-5-4 | Model A GLM-5.1 | Model B GPT-5.4 |
|---|---|---|
| Overall leader | Contender | Leading |
| Verified metric wins | 2 wins | 4 wins |
| Where it leads | Cheapest input price, Free providers | Average speed, First-token latency, Provider coverage, Recent tests |
| Model metadata | No OpenRouter metadata is available yet for this model. | GPT-5.4 exposes 1.1M tokens; notable signals: Text input, Image input, File input, Text output. |
| Developer | Zhipu AI | OpenAI |
| Context window | No data | 1.1M tokens |
| Max output | No data | 128K tokens |
| Released | No data | Mar 2026 |
| Modalities | No data | Input TextImageFile Output Text |
| Features | None listed | Text inputImage inputFile inputText outputTool callingStructured outputsJSON modeReasoning |
| Parameters | No data | No data |
| Tokenizer | No data | GPT |
| Knowledge cutoff | No data | No data |
| OpenRouter ID | No data | openai/gpt-5.4 |
| References | No data | No data |
Third-party benchmark profile synced into LMSpeed; only metrics available for both models are shown.
| Metric | GLM-5.1 | GPT-5.4 |
|---|---|---|
| GPQA | 86.8%#22 | 92.0%#3 |
| SciCode | 43.8%#26 | 56.6%#3 |
| HLE | 28.0%#18 | 41.6%#4 |
| Time to first token | 0.90 s#31 | 134.24 s#110 |
| Input price | $1.40/M#32 | $2.50/M#37 |
| Output price | $4.40/M#33 | $15.00/M#44 |
| Blended price | $2.15/M#53 | $5.63/M#63 |
| Output speed | 71.0 tok/s#72 | 92.4 tok/s#56 |
Latest completed audits from shared providers, with four safety and integrity score groups plus report links.
| Provider | GLM-5.1 | GPT-5.4 |
|---|---|---|
钠 APIWinner: GPT-5.4 | GLM-5.1 ZhipuAI/GLM-5.1 No audit yet | GPT-5.4 gpt-5.4 Audit score 90 1008476100 |
VSLLMWinner: GLM-5.1 | GLM-5.1 glm-5.1-free Audit score 79 678465100 | GPT-5.4 gpt-5.4 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-5.4 |
|---|---|---|
Mars HK125 tests | GLM-5.1 speed / latency N/A / N/A input / output No data | GPT-5.4 speed / latency 49 tok/s / 6084ms input / output No data |
Mars HK100 tests | GLM-5.1 speed / latency N/A / N/A input / output No data | GPT-5.4 speed / latency 57 tok/s / 3556ms input / output No data |
星见雅 API25 tests | GLM-5.1 speed / latency 22 tok/s / 9579ms input / output No data | GPT-5.4 speed / latency 49 tok/s / 5435ms input / output No data |
6345ywz API15 tests | GLM-5.1 speed / latency N/A / N/A input / output No data | GPT-5.4 speed / latency 41 tok/s / 6581ms input / output No data |
Fengsili API15 tests | GLM-5.1 speed / latency 46 tok/s / 10246ms input / output No data | GPT-5.4 speed / latency 88 tok/s / 6075ms input / output No data |
GLM-5.1 z-ai/glm-5.1 speed / latency No data input / output $0/M / $0/M | GPT-5.4 gpt-5.4-openai-compact speed / latency No data input / output $2.50/M / $15.00/M | |
GLM-5.1 GLM-5.1 speed / latency No data input / output $0/M / $0/M | GPT-5.4 GPT-5.4 speed / latency No data input / output $75.00/M / $75.00/M | |
GLM-5.1 glm-5.1-free speed / latency No data input / output $0.0007/M / $0.0007/M | GPT-5.4 gpt-5.4-openai-compact speed / latency No data input / output $0.365/M / $0.365/M | |
GLM-5.1 ZhipuAI/GLM-5.1 speed / latency No data input / output $0.0068/M / $0.0068/M | GPT-5.4 gpt-5.4-openai-compact speed / latency No data input / output $0.342/M / $2.05/M | |
GLM-5.1 GLM-5.1 speed / latency No data input / output $0.0068/M / $0.0068/M | GPT-5.4 gpt-5.4 speed / latency No data input / output $0.342/M / $2.05/M |
This report only uses LMSpeed data for GLM-5.1 and GPT-5.4: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.
| Guidance | GLM-5.1 | GPT-5.4 |
|---|---|---|
| When to choose each model | GLM-5.1 GLM-5.1 is stronger when you prioritize Cheapest input price, Free providers. | GPT-5.4 GPT-5.4 is stronger when you prioritize Average speed, First-token latency, Provider coverage, Recent tests. |
TL;DR: GPT-5.4 leads across 82 verifiable data points, including pricing, speed, latency, benchmarks, and provider examples.
Continue from GLM-5.1 vs GPT-5.4 into nearby model comparisons with enough verified LMSpeed data.
Rankings are based on community-submitted tests and periodic health probes. Advisory only, not official data.
