Gemini 3 Flash vs GPT-5.4 Pro
Gemini 3 Flash 
GPT-5.4 Pro Verdict
- GPT-5.4 Pro leads on quality: 64.3 vs 61.6.
- Gemini 3 Flash (thinking) is stronger in agents & tools, composite, instruction following, long context.
- GPT-5.4 Pro is stronger in knowledge, multimodal, reasoning.
- Gemini 3 Flash (thinking) is 60× cheaper ($1.13 vs $67.50 per 1M blended).
- Gemini 3 Flash (thinking) streams 180.2× faster (180 vs 1 tokens per second).
| Metric | Gemini 3 Flash (thinking) | GPT-5.4 Pro |
|---|---|---|
| BenchLeader Index | 61.6 | 64.3 |
| Agents & tools score | 67.4 | – |
| Composite score | 62.3 | – |
| Instruction following score | 75.4 | 67.3 |
| Knowledge score | 69.0 | 73.6 |
| Long context score | 65.5 | – |
| Multimodal score | 64.4 | 69.8 |
| Reasoning score | – | 75.3 |
| Blended price $/M | $1.13 | $67.50 |
| Output speed | 180 tok/s | 1 tok/s |
| Time to first answer | 6.1 s | 6.5 s |
| Context window | 1M | 1.1M |
| Humanity's Last Exam | – | 44.3% |
| SimpleBench | – | 74.1% |
| Epoch Capabilities Index | – | 158.9 |
| AA Intelligence Index | 26.3 | – |
| IFBench | 78.0% | – |
| AA-LCR | 78.0% | – |
| MMMU-Pro | 79.9% | – |
| AA-Omniscience | 10.1 | – |
| Terminal-Bench Hard | 38.6% | – |
| GPQA Diamond (AA) | 89.8% | – |
| Humanity's Last Exam (AA) | 36.6% | – |
| τ²-Bench Telecom (AA) | 80.4% | – |
| MultiChallenge | – | 69.2% |
| VISTA | – | 53.9% |
| MultiNRC | – | 62.3% |
| TutorBench | – | 56.6% |
Data as of 2026-09-10. Best configuration of each model; every score links to its source on the model pages.
Gemini 3 Flash vs GPT-5.4 Pro: questions
- Is Gemini 3 Flash better than GPT-5.4 Pro?
- GPT-5.4 Pro leads on quality: 64.3 vs 61.6. The BenchLeader Index combines every independent quality benchmark; GPT-5.4 Pro is ahead overall as of 2026-09-10, but check the category scores for your use.
- Which is cheaper, Gemini 3 Flash or GPT-5.4 Pro?
- Gemini 3 Flash is cheaper: $1.13 against $67.50 per million tokens, blended at three input tokens per output token.
- Which is faster, Gemini 3 Flash or GPT-5.4 Pro?
- Gemini 3 Flash streams faster: 180 against 1 output tokens per second.
- Which has the larger context window?
- GPT-5.4 Pro accepts more context: 1.1M against 1M tokens.