Gemini 3.5 Flash vs GPT-6 Sol
Gemini 3.5 Flash 
GPT-6 Sol Verdict
- GPT-6 Sol (max) leads on quality: 67.7 vs 63.7.
- Gemini 3.5 Flash (medium) is stronger in agents & tools, coding, human preference, instruction following, maths.
- GPT-6 Sol (max) is stronger in composite, knowledge, long context, reasoning.
- Gemini 3.5 Flash (medium) is 1.2× cheaper ($3.38 vs $4.00 per 1M blended).
- Gemini 3.5 Flash (medium) streams 1.7× faster (218 vs 126 tokens per second).
| Metric | Gemini 3.5 Flash (medium) | GPT-6 Sol (max) |
|---|---|---|
| BenchLeader Index | 63.7 | 67.7 |
| Agents & tools score | 67.9 | – |
| Coding score | 58.7 | – |
| Composite score | 69.5 | 86.2 |
| Human preference score | 67.5 | – |
| Instruction following score | 72.7 | – |
| Knowledge score | 72.5 | 75.4 |
| Long context score | 62.9 | 67.7 |
| Maths score | 67.2 | – |
| Multimodal score | 67.1 | 67.1 |
| Reasoning score | 62.9 | 95.0 |
| Blended price $/M | $3.38 | $4.00 |
| Output speed | 218 tok/s | 126 tok/s |
| Time to first answer | 12.8 s | 107.2 s |
| Context window | 1.0M | 1.1M |
| LMArena Text | 1474 | – |
| LMArena Hard Prompts | 1493 | – |
| LMArena Coding | 1502 | – |
| LMArena WebDev | 1492 | – |
| LMArena Vision | 1307 | – |
| AA Intelligence Index | 33.6 | 47.5 |
| IFBench | 74.6% | – |
| AA-LCR | 74.3% | 83.7% |
| MMMU-Pro | 83.9% | 83.3% |
| AA-Omniscience | 20.8 | 27.1 |
| Terminal-Bench Hard | 39.4% | – |
| GPQA Diamond (AA) | 92.1% | – |
| Humanity's Last Exam (AA) | 41.3% | 47.9% |
| SciCode (AA) | – | 57.6% |
| τ²-Bench Telecom (AA) | 95.6% | – |
| CritPt | 10.9% | 30.9% |
| GDPval (AA) | – | 49.4% |
| LMArena Maths | 1478 | – |
| LMArena Creative Writing | 1466 | – |
| LMArena Instruction Following | 1463 | – |
| LMArena Multi-turn | 1476 | – |
| LMArena Longer Queries | 1478 | – |
| LMArena Document | 1461 | – |
| Surface Evolver Bench | 58.1% | – |
| DeepSWE | 37.4% | – |
| GDP.pdf | 14.0% | – |
| Terminal-Bench 4.0 (AA) | – | 43.9% |
| AutomationBench | – | 61.6% |
| GDP.pdf | – | 24.8% |
| MLCR | – | 16.1% |
| AA-Omniscience: accuracy | 51.0% | 54.5% |
| AA-Omniscience: non-hallucination | 38.2% | 39.9% |
| AA-Briefcase | – | 1483 |
Data as of 2026-09-23. Best configuration of each model; every score links to its source on the model pages.
Gemini 3.5 Flash vs GPT-6 Sol: questions
- Is Gemini 3.5 Flash better than GPT-6 Sol?
- GPT-6 Sol (max) leads on quality: 67.7 vs 63.7. The BenchLeader Index combines every independent quality benchmark; GPT-6 Sol (max) is ahead overall as of 2026-09-23, but check the category scores for your use.
- Which is cheaper, Gemini 3.5 Flash or GPT-6 Sol?
- Gemini 3.5 Flash is cheaper: $3.38 against $4.00 per million tokens, blended at three input tokens per output token.
- Which is faster, Gemini 3.5 Flash or GPT-6 Sol?
- Gemini 3.5 Flash streams faster: 218 against 126 output tokens per second.
- Which has the larger context window?
- GPT-6 Sol accepts more context: 1.1M against 1.0M tokens.