# 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.

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

## Summary

- 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.

## Snapshot

| | Gemini 1.5 Flash 8B | GPT-5.5 Pro |
|---|---|---|
| Provider | Google | OpenAI |
| Noometry Index | 29.9 | 64.3 |
| Rank | 301 | 8 |
| Context | — | 1.05M |
| Input $/M | — | $30 |
| Output $/M | — | $180 |
| Weights | Proprietary | Proprietary |

## Coding

- 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

- 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

- 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

- 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

- 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

- 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

- 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

- 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

- 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 | — |

## FAQ

### 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.