Data points: 82
The readout for GLM-4.5 Air 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 1 to 5.
Evidence depth
82 data points
Includes 8 benchmark rows, 0 audit samples, and 9 provider examples.
Selection signal
Start with GPT-5.4
The charts below split 17 high-signal samples across speed, scores, and audit health.
Model compare GLM-4.5 Air vs GPT-5.4glm-4-5-air-vs-gpt-5-4 | Model A GLM-4.5 Air | Model B GPT-5.4 |
|---|---|---|
| Overall leader | Contender | Leading |
| Verified metric wins | 1 wins | 5 wins |
| Where it leads | Average speed | Cheapest input price, First-token latency, Free providers, Provider coverage, Recent tests |
| Model metadata | GLM-4.5 Air exposes 131.1K tokens; notable signals: Text input, Text output, Tool calling, Structured outputs. | GPT-5.4 exposes 1.1M tokens; notable signals: Text input, Image input, File input, Text output. |
| Developer | Zhipu AI | OpenAI |
| Context window | 131.1K tokens | 1.1M tokens |
| Max output | 131.1K tokens | 128K tokens |
| Released | Jul 2025 | Mar 2026 |
| Modalities | Input Text Output Text | Input TextImageFile Output Text |
| Features | Text inputText outputTool callingStructured outputsJSON modeReasoning | Text inputImage inputFile inputText outputTool callingStructured outputsJSON modeReasoning |
| Parameters | No data | No data |
| Tokenizer | Other | GPT |
| Knowledge cutoff | 2024-12-31 | No data |
| OpenRouter ID | z-ai/glm-4.5-air | 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-4.5 Air | GPT-5.4 |
|---|---|---|
| GPQA | 73.3%#74 | 92.0%#3 |
| SciCode | 30.6%#90 | 56.6%#3 |
| HLE | 6.8%#79 | 41.6%#4 |
| Input price | $0.170/M#10 | $2.50/M#37 |
| Output price | $0.980/M#16 | $15.00/M#44 |
| Blended price | $0.372/M#20 | $5.63/M#63 |
| Output speed | 82.9 tok/s#62 | 92.4 tok/s#56 |
| Time to first token | 1.65 s#62 | 134.24 s#110 |
Latest completed audits from shared providers, with four safety and integrity score groups plus report links.
| Provider | GLM-4.5 Air | GPT-5.4 |
|---|---|---|
| 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-5.4 |
|---|---|---|
Mars HK125 tests | GLM-4.5 Air speed / latency N/A / N/A input / output No data | GPT-5.4 speed / latency 49 tok/s / 6084ms input / output No data |
6345ywz API15 tests | GLM-4.5 Air zai-org/GLM-4.5-Air speed / latency N/A / N/A input / output $0.019/M / $0.118/M | GPT-5.4 gpt-5.4 speed / latency 41 tok/s / 6581ms input / output $0.342/M / $2.05/M |
OpenRouter10 tests | GLM-4.5 Air speed / latency 20 tok/s / 33054ms input / output No data | GPT-5.4 speed / latency N/A / N/A input / output No data |
素墨API10 tests | GLM-4.5 Air speed / latency 27 tok/s / 39365ms input / output No data | GPT-5.4 speed / latency N/A / N/A input / output No data |
Chlink API5 tests | GLM-4.5 Air speed / latency N/A / N/A input / output No data | GPT-5.4 speed / latency 50 tok/s / 5476ms input / output No data |
GLM-4.5 Air z-ai/glm-4.5-air:free speed / latency No data input / output $0.0050/M / $0.0050/M | GPT-5.4 gpt-5.4 speed / latency No data input / output $0.600/M / $4.80/M | |
GLM-4.5 Air glm-4.5-air speed / latency No data input / output $0.010/M / $0.010/M | GPT-5.4 gpt-5.4-high speed / latency No data input / output $0.050/M / $0.050/M | |
GLM-4.5 Air glm-4.5-air speed / latency No data input / output $0.014/M / $0.075/M | GPT-5.4 gpt-5.4 speed / latency No data input / output $0.171/M / $1.03/M | |
GLM-4.5 Air zai-org/GLM-4.5-Air speed / latency No data input / output $1.03/M / $1.03/M | GPT-5.4 gpt-5.4-xhigh speed / latency No data input / output $0.034/M / $0.205/M |
This report only uses LMSpeed data for GLM-4.5 Air and GPT-5.4: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.
| Guidance | GLM-4.5 Air | GPT-5.4 |
|---|---|---|
| When to choose each model | GLM-4.5 Air GLM-4.5 Air is stronger when you prioritize Average speed. | GPT-5.4 GPT-5.4 is stronger when you prioritize Cheapest input price, First-token latency, Free providers, 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-4.5 Air 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.
