Gemini 3.5 Flash vs Gemini 3 Pro
Gemini 3.5 Flash Verdict
- Gemini 3.5 Flash (medium) leads on quality: 64.1 vs 61.7.
- Gemini 3.5 Flash (medium) is stronger in agents & tools, composite, instruction following, knowledge, multimodal.
- Gemini 3 Pro is stronger in human preference, long context, maths.
- Gemini 3.5 Flash (medium) is 1.3× cheaper ($3.38 vs $4.50 per 1M blended).
| Metric | Gemini 3.5 Flash (medium) | Gemini 3 Pro |
|---|---|---|
| BenchLeader Index | 64.1 | 61.7 |
| Agents & tools score | 68.0 | 62.3 |
| Coding score | 58.9 | 58.9 |
| Composite score | 71.5 | 64.3 |
| Human preference score | 67.8 | 69.0 |
| Instruction following score | 72.5 | 64.3 |
| Knowledge score | 74.0 | 60.9 |
| Long context score | 63.6 | 64.5 |
| Multimodal score | 67.6 | 65.7 |
| Reasoning score | 67.1 | 67.1 |
| Maths score | – | 48.4 |
| Blended price $/M | $3.38 | $4.50 |
| Output speed | 217 tok/s | – |
| Time to first answer | 15.5 s | – |
| Context window | 1M | 1M |
| GPQA Diamond | – | 92.6% |
| OTIS Mock AIME | – | 91.4% |
| SWE-bench Verified (Epoch) | – | 72.9% |
| Humanity's Last Exam | – | 37.5% |
| Terminal-Bench | – | 69.4% |
| SimpleBench | – | 76.4% |
| GDPval | – | 40.3% |
| Remote Labor Index | – | 1.3% |
| WeirdML | – | 69.9% |
| APEX-Agents | – | 31.5% |
| ProofBench | – | 20.0% |
| GSO-Bench | – | 18.6% |
| Epoch Capabilities Index | – | 153.0 |
| LMArena Text | 1476 | 1486 |
| LMArena Hard Prompts | 1493 | 1504 |
| LMArena Coding | 1503 | 1518 |
| LMArena WebDev | 1491 | 1439 |
| LMArena Vision | 1306 | 1305 |
| AA Intelligence Index | 33.6 | 28.0 |
| IFBench | 74.6% | 70.4% |
| AA-LCR | 74.3% | 76.0% |
| MMMU-Pro | 83.9% | 80.2% |
| AA-Omniscience | 20.8 | 15.3 |
| Terminal-Bench Hard | 39.4% | 41.7% |
| GPQA Diamond (AA) | 92.1% | 90.8% |
| Humanity's Last Exam (AA) | 41.3% | 39.7% |
| τ²-Bench Telecom (AA) | 95.6% | 87.1% |
| LiveCodeBench | – | 86.4% |
| MMLU-Pro | – | 90.1% |
| AIME 2026 | – | 91.7% |
| HMMT February 2026 | – | 86.4% |
| MathArena Apex | – | 23.4% |
| SWE-Bench Pro | – | 43.3% |
| MCP Atlas | – | 70.3% |
| MultiChallenge | – | 65.7% |
| PRBench Finance | – | 39.2% |
| PRBench Legal | – | 40.6% |
| VISTA | – | 51.5% |
| MultiNRC | – | 59.0% |
| TutorBench | – | 53.7% |
| MMMU-Pro (official) | – | 81.0% |
| Kagi LLM Benchmark | – | 80.1% |
| SWE-bench Verified (bash only) | – | 74.2% |
| SWE-bench Verified (any scaffold) | – | 77.4% |
| ARC-AGI-1 | – | 75.0% |
| ARC-AGI-2 | – | 54.0% |
| BFCL Overall | – | 72.5% |
Data as of 2026-09-10. Best configuration of each model; every score links to its source on the model pages.
Gemini 3.5 Flash vs Gemini 3 Pro: questions
- Is Gemini 3.5 Flash better than Gemini 3 Pro?
- Gemini 3.5 Flash (medium) leads on quality: 64.1 vs 61.7. The BenchLeader Index combines every independent quality benchmark; Gemini 3.5 Flash (medium) is ahead overall as of 2026-09-10, but check the category scores for your use.
- Is Gemini 3.5 Flash better than Gemini 3 Pro for coding?
- They are level in coding (59 each).
- Is Gemini 3.5 Flash better than Gemini 3 Pro for agentic tasks?
- Gemini 3.5 Flash scores higher in agentic tasks (68 vs 62 on the category index, where 50 is average).
- Which is cheaper, Gemini 3.5 Flash or Gemini 3 Pro?
- Gemini 3.5 Flash is cheaper: $3.38 against $4.50 per million tokens, blended at three input tokens per output token.
- Which has the larger context window?
- Both accept 1M tokens of context.