Model comparison
Gemini 1.5 Flash 8B vs o3-pro
o3-pro is the stronger model overall, scoring 42.7 to 29.7 on the Noometry Index.
Last verified . 1 shared benchmarks.
GoogleSummary
- They share 1 benchmark with published results for both. Gemini 1.5 Flash 8B scores higher in 0 categories and o3-pro in 5 categories; 5 gaps are clear of the uncertainty.
- The widest gap is in long context, where o3-pro leads 72.1 to 36.9.
- The biggest single-benchmark swing is DTBench: 50% for Gemini 1.5 Flash 8B and 86.9% for o3-pro.
Side by side
| Gemini 1.5 Flash 8B | o3-pro | |
|---|---|---|
| Provider | OpenAI | |
| Noometry Index | 29.7 | 42.7 |
| Released | 2024-10-03 | 2025-06-10 |
| Weights | Proprietary | Proprietary |
| Context window | — | 200K |
| Max output | — | 100K |
| Input $ / M tokens | — | $20 |
| Output $ / M tokens | — | $80 |
| Results tracked | 21 | 12 |
Sponsored placements are available on pages like this one. Advertise on Noometry
Category by category
Coding o3-pro leads
Gemini 1.5 Flash 8B: 34.9 (#221), o3-pro: 55.1 (#22)
| Benchmark | Gemini 1.5 Flash 8B | o3-pro |
|---|---|---|
| Aider Polyglot | — | 84.9% |
| WeirdML | — | 58.2% |
| LMArena Coding | 1218 | — |
Reasoning o3-pro leads
Gemini 1.5 Flash 8B: 19.2 (#242), o3-pro: 24.1 (#152)
| Benchmark | Gemini 1.5 Flash 8B | o3-pro |
|---|---|---|
| DTBench | 50% | 86.9% |
| ARC-AGI-2 | — | 4.9% |
| Kagi LLM Benchmark | — | 72.1% |
| ARC-AGI-1 | — | 59.3% |
| LMArena Hard Prompts | 1210 | — |
| LMCA | — | 38.5% |
| Epoch Capabilities Index | — | 147.43 |
Math Not comparable
Gemini 1.5 Flash 8B: 13.3 (#296), o3-pro: —
| Benchmark | Gemini 1.5 Flash 8B | o3-pro |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 4.6% | — |
| LMArena Math | 1207 | — |
Knowledge o3-pro leads
Gemini 1.5 Flash 8B: 16.0 (#285), o3-pro: 29.0 (#234)
| Benchmark | Gemini 1.5 Flash 8B | o3-pro |
|---|---|---|
| GPQA Diamond | 33% | — |
| Confabulations | — | 14.2% |
| Vectara Hallucination Rate | — | 23.3% |
| LMArena Expert | 1185 | — |
Multimodal Not comparable
Gemini 1.5 Flash 8B: 27.6 (#110), o3-pro: —
| Benchmark | Gemini 1.5 Flash 8B | o3-pro |
|---|---|---|
| LMArena Vision | 1044 | — |
Multilingual Not comparable
Gemini 1.5 Flash 8B: 38.6 (#224), o3-pro: —
| Benchmark | Gemini 1.5 Flash 8B | o3-pro |
|---|---|---|
| LMArena Non-English | 1215 | — |
| LMArena Chinese | 1231 | — |
| LMArena French | 1233 | — |
| LMArena German | 1206 | — |
| LMArena Japanese | 1150 | — |
| LMArena Korean | 1140 | — |
| LMArena Russian | 1236 | — |
| LMArena Spanish | 1212 | — |
Instruction Following Not comparable
Gemini 1.5 Flash 8B: 63.1 (#231), o3-pro: —
| Benchmark | Gemini 1.5 Flash 8B | o3-pro |
|---|---|---|
| LMArena Instruction Following | 1199 | — |
Long Context o3-pro leads
Gemini 1.5 Flash 8B: 36.9 (#220), o3-pro: 72.1 (#1)
| Benchmark | Gemini 1.5 Flash 8B | o3-pro |
|---|---|---|
| Fiction.LiveBench | — | 97.2% |
| LMArena Longer Query | 1219 | — |
Writing & Preference o3-pro leads
Gemini 1.5 Flash 8B: 43.0 (#227), o3-pro: 57.1 (#128)
| Benchmark | Gemini 1.5 Flash 8B | o3-pro |
|---|---|---|
| LMArena Text | 1226 | — |
| LMArena Creative Writing | 1218 | — |
| Short-Story Creative Writing | — | 84.4% |
| LMArena Multi-Turn | 1185 | — |
Frequently asked questions
Is Gemini 1.5 Flash 8B better than o3-pro?
o3-pro is the stronger model overall, scoring 42.7 to 29.7 on the Noometry Index.
Is Gemini 1.5 Flash 8B or o3-pro better for coding?
o3-pro scores higher on coding benchmarks: 55.1 versus 34.9 in the Noometry coding category.
How many benchmarks do Gemini 1.5 Flash 8B and o3-pro share?
1 benchmark has published results for both models. Gemini 1.5 Flash 8B has 21 scored results on Noometry and o3-pro has 12.