# Gemini 1.5 Flash 8B vs o3

> o3 is the stronger model overall, scoring 47.5 to 29.9 on the Noometry Index.

- Canonical page: https://noometry.com/compare/gemini-1-5-flash-8b-vs-o3
- Last updated: 2026-10-10
- Shared benchmarks: 21

## Summary

- They share 21 benchmarks with published results for both. Gemini 1.5 Flash 8B scores higher in 0 categories and o3 in 9 categories; 9 gaps are clear of the uncertainty.
- The widest gap is in knowledge, where o3 leads 54.6 to 16.0.
- The biggest single-benchmark swing is OTIS Mock AIME 2024-2025: 4.6% for Gemini 1.5 Flash 8B and 84.4% for o3.

## Snapshot

| | Gemini 1.5 Flash 8B | o3 |
|---|---|---|
| Provider | Google | OpenAI |
| Noometry Index | 29.9 | 47.5 |
| Rank | 301 | 61 |
| Context | — | 200K |
| Input $/M | — | $2 |
| Output $/M | — | $8 |
| Weights | Proprietary | Proprietary |

## Coding

- Gemini 1.5 Flash 8B: 35.5 (#225)
- o3: 46.8 (#64)

| Benchmark | Gemini 1.5 Flash 8B | o3 |
|---|---|---|
| LMArena Coding | 1218 | 1408 |
| SWE-bench Verified | — | 62.3% |
| SWE-bench Verified (bash only) | — | 58.4% |
| Aider Polyglot | — | 81.3% |
| GSO | — | 8.8% |
| WeirdML | — | 52.4% |
| CadEval | — | 74% |
| ALE-Bench | — | 933.55 |

## Agentic & Tool Use

- Gemini 1.5 Flash 8B: —
- o3: 34.5 (#44)

| Benchmark | Gemini 1.5 Flash 8B | o3 |
|---|---|---|
| Berkeley Function Calling Leaderboard | — | 63% |
| GDPval | — | 30.8% |
| DeepResearch Bench | — | 45.2% |
| OSWorld | — | 23% |
| LMArena Search | — | 1144 |
| METR Time Horizons | — | 65.4% |

## Reasoning

- Gemini 1.5 Flash 8B: 20.0 (#244)
- o3: 32.0 (#78)

| Benchmark | Gemini 1.5 Flash 8B | o3 |
|---|---|---|
| LMArena Hard Prompts | 1209 | 1402 |
| DTBench | 50% | 84.8% |
| ARC-AGI-2 | — | 6.5% |
| SimpleBench | — | 53.1% |
| Kagi LLM Benchmark | — | 67.6% |
| ARC-AGI-1 | — | 60.8% |
| CritPt | — | 1.4% |
| Chess Puzzles | — | 38% |
| EnigmaEval | — | 13.1% |
| Mystery Game Puzzles | — | 29% |
| LMCA | — | 39.7% |
| Epoch Capabilities Index | — | 146.86 |
| ForecastBench | — | 62.5 |

## Math

- Gemini 1.5 Flash 8B: 14.2 (#302)
- o3: 50.2 (#58)

| Benchmark | Gemini 1.5 Flash 8B | o3 |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 4.6% | 84.4% |
| LMArena Math | 1207 | 1426 |
| FrontierMath (Tiers 1-3) | — | 33.3% |
| Omni-MATH | — | 71.4% |
| MATH Level 5 | — | 97.8% |
| FrontierMath (Feb 2025 set) | — | 18.7% |
| FrontierMath Tier 4 (v1) | — | 2.1% |

## Knowledge

- Gemini 1.5 Flash 8B: 16.0 (#289)
- o3: 54.6 (#52)

| Benchmark | Gemini 1.5 Flash 8B | o3 |
|---|---|---|
| GPQA Diamond | 33% | 81.8% |
| LMArena Expert | 1185 | 1402 |
| Humanity's Last Exam | — | 20.3% |
| SimpleQA Verified | — | 49.4% |
| MMLU-Pro | — | 85.9% |
| Confabulations | — | 14.4% |
| GPQA (HELM) | — | 75.3% |

## Multimodal

- Gemini 1.5 Flash 8B: 28.2 (#115)
- o3: 41.4 (#36)

| Benchmark | Gemini 1.5 Flash 8B | o3 |
|---|---|---|
| LMArena Vision | 1044 | 1214 |
| GeoBench | — | 74% |
| VPCT | — | 52% |

## Multilingual

- Gemini 1.5 Flash 8B: 38.5 (#229)
- o3: 51.7 (#105)

| Benchmark | Gemini 1.5 Flash 8B | o3 |
|---|---|---|
| LMArena Non-English | 1215 | 1401 |
| LMArena Chinese | 1231 | 1437 |
| LMArena French | 1234 | 1430 |
| LMArena German | 1206 | 1420 |
| LMArena Japanese | 1150 | 1403 |
| LMArena Korean | 1140 | 1370 |
| LMArena Russian | 1236 | 1406 |
| LMArena Spanish | 1212 | 1395 |

## Instruction Following

- Gemini 1.5 Flash 8B: 62.8 (#236)
- o3: 72.8 (#127)

| Benchmark | Gemini 1.5 Flash 8B | o3 |
|---|---|---|
| LMArena Instruction Following | 1199 | 1368 |
| IFEval | — | 86.9% |

## Long Context

- Gemini 1.5 Flash 8B: 37.0 (#225)
- o3: 53.3 (#6)

| Benchmark | Gemini 1.5 Flash 8B | o3 |
|---|---|---|
| LMArena Longer Query | 1219 | 1372 |
| Fiction.LiveBench | — | 88.9% |
| CL-bench | — | 17.8% |

## Writing & Preference

- Gemini 1.5 Flash 8B: 42.8 (#232)
- o3: 63.5 (#64)

| Benchmark | Gemini 1.5 Flash 8B | o3 |
|---|---|---|
| LMArena Text | 1226 | 1410 |
| LMArena Creative Writing | 1218 | 1359 |
| LMArena Multi-Turn | 1185 | 1405 |
| Short-Story Creative Writing | — | 83.9% |
| EQ-Bench Creative Writing | — | 1676 |
| WildBench | — | 86.1% |

## FAQ

### Is Gemini 1.5 Flash 8B better than o3?

o3 is the stronger model overall, scoring 47.5 to 29.9 on the Noometry Index.

### Is Gemini 1.5 Flash 8B or o3 better for coding?

o3 scores higher on coding benchmarks: 46.8 versus 35.5 in the Noometry coding category.

### How many benchmarks do Gemini 1.5 Flash 8B and o3 share?

21 benchmarks have published results for both models. Gemini 1.5 Flash 8B has 21 scored results on Noometry and o3 has 63.