Data points: 62
The readout for Gemini 1.5 Flash and GPT-5.4, before the detailed comparison sheet.
Decision read
Tie
Tie currently has the stronger profile, with verified wins split 3 to 3.
Evidence depth
62 data points
Includes 3 benchmark rows, 0 audit samples, and 7 provider examples.
Selection signal
Tie
The charts below split 10 high-signal samples across speed, scores, and audit health.
Model compare Gemini 1.5 Flash vs GPT-5.4gemini-1-5-flash-vs-gpt-5-4 | Model A Gemini 1.5 Flash | Model B GPT-5.4 |
|---|---|---|
| Overall leader | Tie | Tie |
| Verified metric wins | 3 wins | 3 wins |
| Where it leads | Cheapest input price, Average speed, First-token latency | Free providers, 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 | 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 | Gemini 1.5 Flash | GPT-5.4 |
|---|---|---|
| GPQA | 46.3%#124 | 92.0%#3 |
| SciCode | 26.7%#97 | 56.6%#3 |
| HLE | 3.5%#100 | 41.6%#4 |
Latest completed audits from shared providers, with four safety and integrity score groups plus report links.
| Provider | Gemini 1.5 Flash | 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 | Gemini 1.5 Flash | GPT-5.4 |
|---|---|---|
V-API15 tests | Gemini 1.5 Flash speed / latency 163 tok/s / 1183ms input / output No data | GPT-5.4 speed / latency N/A / N/A input / output No data |
丸美小沐15 tests | Gemini 1.5 Flash speed / latency 236 tok/s / 1159ms input / output No data | GPT-5.4 speed / latency N/A / N/A input / output No data |
UoCode5 tests | Gemini 1.5 Flash models/gemini-1.5-flash speed / latency N/A / N/A input / output $0.014/M / $0.137/M | GPT-5.4 gpt-5.4-openai-compact speed / latency 31 tok/s / 2364ms input / output $10.27/M / $61.64/M |
VSLLM5 tests | Gemini 1.5 Flash speed / latency N/A / N/A input / output No data | GPT-5.4 speed / latency 60 tok/s / 2482ms input / output No data |
天絮 API5 tests | Gemini 1.5 Flash speed / latency N/A / N/A input / output No data | GPT-5.4 speed / latency 46 tok/s / 3291ms input / output No data |
Gemini 1.5 Flash gemini-1.5-flash-latest speed / latency No data input / output $0.0033/M / $0.013/M | GPT-5.4 gpt-5.4-xhigh speed / latency No data input / output $0.034/M / $0.205/M | |
Gemini 1.5 Flash models/gemini-1.5-flash speed / latency No data input / output $0.014/M / $0.137/M | GPT-5.4 gpt-5.4-openai-compact speed / latency No data input / output $10.27/M / $61.64/M |
This report only uses LMSpeed data for Gemini 1.5 Flash and GPT-5.4: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.
| Guidance | Gemini 1.5 Flash | GPT-5.4 |
|---|---|---|
| When to choose each model | Gemini 1.5 Flash Gemini 1.5 Flash is stronger when you prioritize Cheapest input price, Average speed, First-token latency. | GPT-5.4 GPT-5.4 is stronger when you prioritize Free providers, Provider coverage, Recent tests. |
TL;DR: Tie leads across 62 verifiable data points, including pricing, speed, latency, benchmarks, and provider examples.
Continue from Gemini 1.5 Flash 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.
