Data points: 86
The readout for Gemini 2.5 Flash 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
86 data points
Includes 8 benchmark rows, 1 audit samples, and 8 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 Gemini 2.5 Flash vs GPT-5.4gemini-2-5-flash-vs-gpt-5-4 | Model A Gemini 2.5 Flash | Model B GPT-5.4 |
|---|---|---|
| Overall leader | Contender | Leading |
| Verified metric wins | 2 wins | 4 wins |
| Where it leads | Cheapest input price, Average speed | First-token latency, Free providers, Provider coverage, Recent tests |
| Model metadata | Gemini 2.5 Flash exposes 1.0M tokens; notable signals: Text input, Image input, File input, Audio input. | GPT-5.4 exposes 1.1M tokens; notable signals: Text input, Image input, File input, Text output. |
| Developer | OpenAI | |
| Context window | 1.0M tokens | 1.1M tokens |
| Max output | 65.5K tokens | 128K tokens |
| Released | Jun 2025 | Mar 2026 |
| Modalities | Input FileImageTextAudiovideo Output Text | Input TextImageFile Output Text |
| Features | Text inputImage inputFile inputAudio inputText outputTool callingStructured outputsJSON modeReasoning | Text inputImage inputFile inputText outputTool callingStructured outputsJSON modeReasoning |
| Parameters | No data | No data |
| Tokenizer | Gemini | GPT |
| Knowledge cutoff | 2025-01-31 | No data |
| OpenRouter ID | google/gemini-2.5-flash | 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 2.5 Flash | GPT-5.4 |
|---|---|---|
| GPQA | 68.3%#83 | 92.0%#3 |
| SciCode | 29.1%#93 | 56.6%#3 |
| HLE | 5.1%#86 | 41.6%#4 |
| Time to first answer token | 0.54 s#10 | 134.24 s#111 |
| Output speed | 194.9 tok/s#13 | 92.4 tok/s#56 |
| Time to first token | 0.54 s#14 | 134.24 s#110 |
| Input price | $0.300/M#15 | $2.50/M#37 |
| Output price | $2.50/M#27 | $15.00/M#44 |
Latest completed audits from shared providers, with four safety and integrity score groups plus report links.
| Provider | Gemini 2.5 Flash | GPT-5.4 |
|---|---|---|
钠 APIWinner: GPT-5.4 | Gemini 2.5 Flash gemini-2.5-flash No audit yet | GPT-5.4 gpt-5.4 Audit score 90 1008476100 |
Speed aggregates and input/output pricing share each provider row for real API selection and migration cost checks.
| Provider | Gemini 2.5 Flash | GPT-5.4 |
|---|---|---|
天宫造物50 tests | Gemini 2.5 Flash speed / latency N/A / N/A input / output No data | GPT-5.4 speed / latency 50 tok/s / 7305ms input / output No data |
SWT-API25 tests | Gemini 2.5 Flash speed / latency 139 tok/s / 4002ms input / output No data | GPT-5.4 speed / latency N/A / N/A input / output No data |
0CHAT10 tests | Gemini 2.5 Flash speed / latency N/A / N/A input / output No data | GPT-5.4 speed / latency 51 tok/s / 2526ms input / output No data |
CatClaw API10 tests | Gemini 2.5 Flash speed / latency 54 tok/s / 10365ms input / output No data | GPT-5.4 speed / latency N/A / N/A input / output No data |
Omini Api10 tests | Gemini 2.5 Flash speed / latency N/A / N/A input / output No data | GPT-5.4 speed / latency 51 tok/s / 1443ms input / output No data |
Gemini 2.5 Flash gemini-2.5-flash speed / latency No data input / output $0.0010/M / $0.0010/M | GPT-5.4 gpt-5.4-openai-compact speed / latency No data input / output $0.0010/M / $0.0010/M | |
Gemini 2.5 Flash gemini-2.5-flash-c speed / latency No data input / output $0.0050/M / $0.0050/M | GPT-5.4 gpt-5.4 speed / latency No data input / output $0.450/M / $2.70/M | |
Gemini 2.5 Flash 流式抗截断/gemini-2.5-flash speed / latency No data input / output $0.0050/M / $0.0050/M | GPT-5.4 gpt-5.4-xhigh speed / latency No data input / output $2.50/M / $15.00/M |
This report only uses LMSpeed data for Gemini 2.5 Flash and GPT-5.4: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.
| Guidance | Gemini 2.5 Flash | GPT-5.4 |
|---|---|---|
| When to choose each model | Gemini 2.5 Flash Gemini 2.5 Flash is stronger when you prioritize Cheapest input price, Average speed. | GPT-5.4 GPT-5.4 is stronger when you prioritize First-token latency, Free providers, Provider coverage, Recent tests. |
TL;DR: GPT-5.4 leads across 86 verifiable data points, including pricing, speed, latency, benchmarks, and provider examples.
Continue from Gemini 2.5 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.
