Model comparison
Gemini 1.5 Flash 8B vs Gemini 3.5 Flash
Gemini 3.5 Flash is the stronger model overall, scoring 54.2 to 29.9 on the Noometry Index.
Last verified . 21 shared benchmarks.
GoogleSummary
- They share 21 benchmarks with published results for both. Gemini 1.5 Flash 8B scores higher in 0 categories and Gemini 3.5 Flash in 9 categories; 9 gaps are clear of the uncertainty.
- The widest gap is in knowledge, where Gemini 3.5 Flash leads 66.3 to 16.0.
- The biggest single-benchmark swing is OTIS Mock AIME 2024-2025: 4.6% for Gemini 1.5 Flash 8B and 95.6% for Gemini 3.5 Flash.
Side by side
| Gemini 1.5 Flash 8B | Gemini 3.5 Flash | |
|---|---|---|
| Provider | ||
| Noometry Index | 29.9 | 54.2 |
| Released | 2024-10-03 | 2026-05-19 |
| Weights | Proprietary | Proprietary |
| Context window | — | 1.05M |
| Max output | — | 66K |
| Input $ / M tokens | — | $1.50 |
| Output $ / M tokens | — | $9 |
| Results tracked | 21 | 54 |
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Category by category
Coding Gemini 3.5 Flash leads
Gemini 1.5 Flash 8B: 35.5 (#225), Gemini 3.5 Flash: 49.4 (#49)
| Benchmark | Gemini 1.5 Flash 8B | Gemini 3.5 Flash |
|---|---|---|
| LMArena Coding | 1218 | 1492 |
| SWE-bench Verified | — | 79.3% |
| DeepSWE | — | 37.4% |
| LMArena WebDev | — | 1499 |
| SciCode | — | 53.1% |
| WeirdML | — | 62.6% |
| ALE-Bench | — | 911.02 |
Agentic & Tool Use Not comparable
Gemini 1.5 Flash 8B: —, Gemini 3.5 Flash: 24.7 (#114)
| Benchmark | Gemini 1.5 Flash 8B | Gemini 3.5 Flash |
|---|---|---|
| APEX-Agents | — | 27.5% |
| GBAEval | — | 6.7% |
| GDP.pdf | — | 14% |
| Vending-Bench 2 | — | 5,396 |
Reasoning Gemini 3.5 Flash leads
Gemini 1.5 Flash 8B: 20.0 (#244), Gemini 3.5 Flash: 62.8 (#18)
| Benchmark | Gemini 1.5 Flash 8B | Gemini 3.5 Flash |
|---|---|---|
| LMArena Hard Prompts | 1209 | 1488 |
| DTBench | 50% | 94.7% |
| ARC-AGI-2 | — | 72.1% |
| SimpleBench | — | 76.7% |
| NYT Connections (extended) | — | 92.6% |
| ARC-AGI-1 | — | 92.5% |
| CritPt | — | 13.1% |
| Chess Puzzles | — | 50% |
| EnigmaEval | — | 25.4% |
| EBR-Bench | — | 4.8% |
| Mystery Game Puzzles | — | 32% |
| LMCA | — | 47.1% |
| Surface Evolver Bench | — | 58.1% |
| Epoch Capabilities Index | — | 154.46 |
| ForecastBench | — | 59 |
Math Gemini 3.5 Flash leads
Gemini 1.5 Flash 8B: 14.2 (#302), Gemini 3.5 Flash: 60.7 (#36)
| Benchmark | Gemini 1.5 Flash 8B | Gemini 3.5 Flash |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 4.6% | 95.6% |
| LMArena Math | 1207 | 1504 |
| FrontierMath (Tiers 1-3) | — | 62.8% |
| FrontierMath Tier 4 | — | 26.8% |
| MathArena Final-Answer Competitions | — | 76.3% |
| ProofBench | — | 31% |
| FrontierMath (Feb 2025 set) | — | 39% |
| FrontierMath Tier 4 (v1) | — | 14.6% |
Knowledge Gemini 3.5 Flash leads
Gemini 1.5 Flash 8B: 16.0 (#289), Gemini 3.5 Flash: 66.3 (#11)
| Benchmark | Gemini 1.5 Flash 8B | Gemini 3.5 Flash |
|---|---|---|
| GPQA Diamond | 33% | 92.8% |
| LMArena Expert | 1185 | 1495 |
| SimpleQA Verified | — | 66.2% |
Multimodal Gemini 3.5 Flash leads
Gemini 1.5 Flash 8B: 28.2 (#115), Gemini 3.5 Flash: 45.7 (#15)
| Benchmark | Gemini 1.5 Flash 8B | Gemini 3.5 Flash |
|---|---|---|
| LMArena Vision | 1044 | 1310 |
| Blueprint-Bench 2 | — | 33.6% |
| LMArena Document | — | 1463 |
Multilingual Gemini 3.5 Flash leads
Gemini 1.5 Flash 8B: 38.5 (#229), Gemini 3.5 Flash: 57.0 (#13)
| Benchmark | Gemini 1.5 Flash 8B | Gemini 3.5 Flash |
|---|---|---|
| LMArena Non-English | 1215 | 1476 |
| LMArena Chinese | 1231 | 1526 |
| LMArena French | 1234 | 1490 |
| LMArena German | 1206 | 1492 |
| LMArena Japanese | 1150 | 1486 |
| LMArena Korean | 1140 | 1451 |
| LMArena Russian | 1236 | 1493 |
| LMArena Spanish | 1212 | 1480 |
Instruction Following Gemini 3.5 Flash leads
Gemini 1.5 Flash 8B: 62.8 (#236), Gemini 3.5 Flash: 77.0 (#30)
| Benchmark | Gemini 1.5 Flash 8B | Gemini 3.5 Flash |
|---|---|---|
| LMArena Instruction Following | 1199 | 1467 |
Long Context Gemini 3.5 Flash leads
Gemini 1.5 Flash 8B: 37.0 (#225), Gemini 3.5 Flash: 45.4 (#38)
| Benchmark | Gemini 1.5 Flash 8B | Gemini 3.5 Flash |
|---|---|---|
| LMArena Longer Query | 1219 | 1482 |
Writing & Preference Gemini 3.5 Flash leads
Gemini 1.5 Flash 8B: 42.8 (#232), Gemini 3.5 Flash: 65.5 (#47)
| Benchmark | Gemini 1.5 Flash 8B | Gemini 3.5 Flash |
|---|---|---|
| LMArena Text | 1226 | 1482 |
| LMArena Creative Writing | 1218 | 1470 |
| LMArena Multi-Turn | 1185 | 1481 |
| EQ-Bench 4 | — | 1087 |
Frequently asked questions
Is Gemini 1.5 Flash 8B better than Gemini 3.5 Flash?
Gemini 3.5 Flash is the stronger model overall, scoring 54.2 to 29.9 on the Noometry Index.
Is Gemini 1.5 Flash 8B or Gemini 3.5 Flash better for coding?
Gemini 3.5 Flash scores higher on coding benchmarks: 49.4 versus 35.5 in the Noometry coding category.
How many benchmarks do Gemini 1.5 Flash 8B and Gemini 3.5 Flash share?
21 benchmarks have published results for both models. Gemini 1.5 Flash 8B has 21 scored results on Noometry and Gemini 3.5 Flash has 54.