Model comparison
Gemini 1.5 Flash 8B vs GPT-5.5 Pro
GPT-5.5 Pro is the stronger model overall, scoring 64.3 to 29.9 on the Noometry Index.
Last verified . 3 shared benchmarks.
GoogleSummary
- They share 3 benchmarks with published results for both. Gemini 1.5 Flash 8B scores higher in 0 categories and GPT-5.5 Pro in 3 categories; 3 gaps are clear of the uncertainty.
- The widest gap is in math, where GPT-5.5 Pro leads 84.0 to 14.2.
- The biggest single-benchmark swing is OTIS Mock AIME 2024-2025: 4.6% for Gemini 1.5 Flash 8B and 100% for GPT-5.5 Pro.
Side by side
| Gemini 1.5 Flash 8B | GPT-5.5 Pro | |
|---|---|---|
| Provider | OpenAI | |
| Noometry Index | 29.9 | 64.3 |
| Released | 2024-10-03 | 2026-04-23 |
| Weights | Proprietary | Proprietary |
| Context window | — | 1.05M |
| Max output | — | 128K |
| Input $ / M tokens | — | $30 |
| Output $ / M tokens | — | $180 |
| Results tracked | 21 | 14 |
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Category by category
Coding Not comparable
Gemini 1.5 Flash 8B: 35.5 (#225), GPT-5.5 Pro: —
| Benchmark | Gemini 1.5 Flash 8B | GPT-5.5 Pro |
|---|---|---|
| LMArena Coding | 1218 | — |
Reasoning GPT-5.5 Pro leads
Gemini 1.5 Flash 8B: 20.0 (#244), GPT-5.5 Pro: 73.3 (#10)
| Benchmark | Gemini 1.5 Flash 8B | GPT-5.5 Pro |
|---|---|---|
| DTBench | 50% | 96% |
| ARC-AGI-2 | — | 84.6% |
| SimpleBench | — | 76.9% |
| ARC-AGI-1 | — | 96.5% |
| CritPt | — | 30.6% |
| Chess Puzzles | — | 64% |
| LMArena Hard Prompts | 1209 | — |
| LMCA | — | 53.9% |
| Epoch Capabilities Index | — | 162.07 |
Math GPT-5.5 Pro leads
Gemini 1.5 Flash 8B: 14.2 (#302), GPT-5.5 Pro: 84.0 (#10)
| Benchmark | Gemini 1.5 Flash 8B | GPT-5.5 Pro |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 4.6% | 100% |
| FrontierMath (Tiers 1-3) | — | 87.7% |
| FrontierMath Tier 4 | — | 78% |
| LMArena Math | 1207 | — |
| FrontierMath (Feb 2025 set) | — | 52.4% |
| FrontierMath Tier 4 (v1) | — | 39.6% |
Knowledge GPT-5.5 Pro leads
Gemini 1.5 Flash 8B: 16.0 (#289), GPT-5.5 Pro: 64.1 (#19)
| Benchmark | Gemini 1.5 Flash 8B | GPT-5.5 Pro |
|---|---|---|
| GPQA Diamond | 33% | 93.9% |
| LMArena Expert | 1185 | — |
Multimodal Not comparable
Gemini 1.5 Flash 8B: 28.2 (#115), GPT-5.5 Pro: —
| Benchmark | Gemini 1.5 Flash 8B | GPT-5.5 Pro |
|---|---|---|
| LMArena Vision | 1044 | — |
Multilingual Not comparable
Gemini 1.5 Flash 8B: 38.5 (#229), GPT-5.5 Pro: —
| Benchmark | Gemini 1.5 Flash 8B | GPT-5.5 Pro |
|---|---|---|
| LMArena Non-English | 1215 | — |
| LMArena Chinese | 1231 | — |
| LMArena French | 1234 | — |
| LMArena German | 1206 | — |
| LMArena Japanese | 1150 | — |
| LMArena Korean | 1140 | — |
| LMArena Russian | 1236 | — |
| LMArena Spanish | 1212 | — |
Instruction Following Not comparable
Gemini 1.5 Flash 8B: 62.8 (#236), GPT-5.5 Pro: —
| Benchmark | Gemini 1.5 Flash 8B | GPT-5.5 Pro |
|---|---|---|
| LMArena Instruction Following | 1199 | — |
Long Context Not comparable
Gemini 1.5 Flash 8B: 37.0 (#225), GPT-5.5 Pro: —
| Benchmark | Gemini 1.5 Flash 8B | GPT-5.5 Pro |
|---|---|---|
| LMArena Longer Query | 1219 | — |
Writing & Preference Not comparable
Gemini 1.5 Flash 8B: 42.8 (#232), GPT-5.5 Pro: —
| Benchmark | Gemini 1.5 Flash 8B | GPT-5.5 Pro |
|---|---|---|
| LMArena Text | 1226 | — |
| LMArena Creative Writing | 1218 | — |
| LMArena Multi-Turn | 1185 | — |
Frequently asked questions
Is Gemini 1.5 Flash 8B better than GPT-5.5 Pro?
GPT-5.5 Pro is the stronger model overall, scoring 64.3 to 29.9 on the Noometry Index.
How many benchmarks do Gemini 1.5 Flash 8B and GPT-5.5 Pro share?
3 benchmarks have published results for both models. Gemini 1.5 Flash 8B has 21 scored results on Noometry and GPT-5.5 Pro has 14.