# Gemini 1.5 Flash 8B vs Gemini 3.8 Flash

> Gemini 3.8 Flash is the stronger model overall, scoring 61.8 to 29.9 on the Noometry Index.

- Canonical page: https://noometry.com/compare/gemini-1-5-flash-8b-vs-gemini-3-8-flash
- Last updated: 2026-10-12
- Shared benchmarks: 21

## Summary

- They share 21 benchmarks with published results for both. Gemini 1.5 Flash 8B scores higher in 0 categories and Gemini 3.8 Flash in 9 categories; 9 gaps are clear of the uncertainty.
- The widest gap is in knowledge, where Gemini 3.8 Flash leads 74.8 to 16.0.
- The biggest single-benchmark swing is OTIS Mock AIME 2024-2025: 4.6% for Gemini 1.5 Flash 8B and 98.9% for Gemini 3.8 Flash.

## Snapshot

| | Gemini 1.5 Flash 8B | Gemini 3.8 Flash |
|---|---|---|
| Provider | Google | Google |
| Noometry Index | 29.9 | 61.8 |
| Rank | 301 | 11 |
| Context | — | 1.05M |
| Input $/M | — | $0.75 |
| Output $/M | — | $3.75 |
| Weights | Proprietary | Proprietary |

## Coding

- Gemini 1.5 Flash 8B: 35.5 (#225)
- Gemini 3.8 Flash: 59.2 (#15)

| Benchmark | Gemini 1.5 Flash 8B | Gemini 3.8 Flash |
|---|---|---|
| LMArena Coding | 1218 | 1510 |
| DeepSWE | — | 73.8% |
| FrontierCode | — | 41.2% |
| CursorBench | — | 39.6% |
| LMArena WebDev | — | 1584 |
| FrontierSWE | — | 19.6% |
| SciCode | — | 56.6% |
| WeirdML | — | 84.8% |
| ALE-Bench | — | 1,270 |

## Agentic & Tool Use

- Gemini 1.5 Flash 8B: —
- Gemini 3.8 Flash: 41.8 (#21)

| Benchmark | Gemini 1.5 Flash 8B | Gemini 3.8 Flash |
|---|---|---|
| APEX-Agents | — | 64.3% |
| Remote Labor Index | — | 5.8% |
| GDP.pdf | — | 23.4% |
| Vending-Bench 2 | — | 5,094 |

## Reasoning

- Gemini 1.5 Flash 8B: 20.0 (#244)
- Gemini 3.8 Flash: 76.9 (#5)

| Benchmark | Gemini 1.5 Flash 8B | Gemini 3.8 Flash |
|---|---|---|
| LMArena Hard Prompts | 1209 | 1508 |
| DTBench | 50% | 95.7% |
| ARC-AGI-2 | — | 89.2% |
| NYT Connections (extended) | — | 97.4% |
| ARC-AGI-1 | — | 98.5% |
| CritPt | — | 18.3% |
| Chess Puzzles | — | 61% |
| Mystery Game Puzzles | — | 47% |
| LMCA | — | 52.9% |
| Surface Evolver Bench | — | 76.9% |
| Epoch Capabilities Index | — | 156.71 |

## Math

- Gemini 1.5 Flash 8B: 14.2 (#302)
- Gemini 3.8 Flash: 65.3 (#28)

| Benchmark | Gemini 1.5 Flash 8B | Gemini 3.8 Flash |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 4.6% | 98.9% |
| LMArena Math | 1207 | 1528 |
| FrontierMath (Tiers 1-3) | — | 68.4% |
| FrontierMath Tier 4 | — | 22% |
| ProofBench | — | 48% |

## Knowledge

- Gemini 1.5 Flash 8B: 16.0 (#289)
- Gemini 3.8 Flash: 74.8 (#2)

| Benchmark | Gemini 1.5 Flash 8B | Gemini 3.8 Flash |
|---|---|---|
| GPQA Diamond | 33% | 95.4% |
| LMArena Expert | 1185 | 1524 |
| Humanity's Last Exam | — | 44.5% |
| SimpleQA Verified | — | 69.7% |

## Multimodal

- Gemini 1.5 Flash 8B: 28.2 (#115)
- Gemini 3.8 Flash: 40.7 (#45)

| Benchmark | Gemini 1.5 Flash 8B | Gemini 3.8 Flash |
|---|---|---|
| LMArena Vision | 1044 | 1314 |
| Blueprint-Bench 2 | — | 38.6% |
| Furniture Assembly | — | 31.7% |

## Multilingual

- Gemini 1.5 Flash 8B: 38.5 (#229)
- Gemini 3.8 Flash: 58.0 (#5)

| Benchmark | Gemini 1.5 Flash 8B | Gemini 3.8 Flash |
|---|---|---|
| LMArena Non-English | 1215 | 1491 |
| LMArena Chinese | 1231 | 1554 |
| LMArena French | 1234 | 1498 |
| LMArena German | 1206 | 1493 |
| LMArena Japanese | 1150 | 1502 |
| LMArena Korean | 1140 | 1459 |
| LMArena Russian | 1236 | 1515 |
| LMArena Spanish | 1212 | 1485 |

## Instruction Following

- Gemini 1.5 Flash 8B: 62.8 (#236)
- Gemini 3.8 Flash: 78.0 (#13)

| Benchmark | Gemini 1.5 Flash 8B | Gemini 3.8 Flash |
|---|---|---|
| LMArena Instruction Following | 1199 | 1490 |

## Long Context

- Gemini 1.5 Flash 8B: 37.0 (#225)
- Gemini 3.8 Flash: 46.3 (#24)

| Benchmark | Gemini 1.5 Flash 8B | Gemini 3.8 Flash |
|---|---|---|
| LMArena Longer Query | 1219 | 1508 |

## Writing & Preference

- Gemini 1.5 Flash 8B: 42.8 (#232)
- Gemini 3.8 Flash: 72.2 (#15)

| Benchmark | Gemini 1.5 Flash 8B | Gemini 3.8 Flash |
|---|---|---|
| LMArena Text | 1226 | 1499 |
| LMArena Creative Writing | 1218 | 1492 |
| LMArena Multi-Turn | 1185 | 1501 |
| EQ-Bench Creative Writing | — | 1748 |

## FAQ

### Is Gemini 1.5 Flash 8B better than Gemini 3.8 Flash?

Gemini 3.8 Flash is the stronger model overall, scoring 61.8 to 29.9 on the Noometry Index.

### Is Gemini 1.5 Flash 8B or Gemini 3.8 Flash better for coding?

Gemini 3.8 Flash scores higher on coding benchmarks: 59.2 versus 35.5 in the Noometry coding category.

### How many benchmarks do Gemini 1.5 Flash 8B and Gemini 3.8 Flash share?

21 benchmarks have published results for both models. Gemini 1.5 Flash 8B has 21 scored results on Noometry and Gemini 3.8 Flash has 50.