# Gemini 3.1 Flash Lite vs Gemini 3 Deep Think

> Gemini 3.1 Flash Lite has enough public results to be ranked (#141); Gemini 3 Deep Think does not yet, so treat this comparison as directional.

- Canonical page: https://noometry.com/compare/gemini-3-1-flash-lite-vs-gemini-3-deep-think
- Last updated: 2026-10-10
- Shared benchmarks: 1

## Summary

- They share 1 benchmark with published results for both. Gemini 3.1 Flash Lite scores higher in 0 categories and Gemini 3 Deep Think in 1 category; one gap is clear of the uncertainty.
- The widest gap is in reasoning, where Gemini 3 Deep Think leads 70.8 to 22.3.
- The biggest single-benchmark swing is CritPt: 1.1% for Gemini 3.1 Flash Lite and 25.7% for Gemini 3 Deep Think.

## Snapshot

| | Gemini 3.1 Flash Lite | Gemini 3 Deep Think |
|---|---|---|
| Provider | Google | Google |
| Noometry Index | 40.4 | 58.5 |
| Rank | 141 | — |
| Context | 1.05M | — |
| Input $/M | $0.25 | — |
| Output $/M | $1.50 | — |
| Weights | Proprietary | Proprietary |

## Coding

- Gemini 3.1 Flash Lite: 37.5 (#179)
- Gemini 3 Deep Think: —

| Benchmark | Gemini 3.1 Flash Lite | Gemini 3 Deep Think |
|---|---|---|
| LMArena WebDev | 1256 | — |
| SciCode | 41.9% | — |
| WeirdML | 52.2% | — |
| LMArena Coding | 1400 | — |
| ALE-Bench | 797.73 | — |

## Agentic & Tool Use

- Gemini 3.1 Flash Lite: 29.9 (#72)
- Gemini 3 Deep Think: —

| Benchmark | Gemini 3.1 Flash Lite | Gemini 3 Deep Think |
|---|---|---|
| DeepResearch Bench | 37.3% | — |

## Reasoning

- Gemini 3.1 Flash Lite: 22.3 (#181)
- Gemini 3 Deep Think: 70.8 (#11)

| Benchmark | Gemini 3.1 Flash Lite | Gemini 3 Deep Think |
|---|---|---|
| CritPt | 1.1% | 25.7% |
| ARC-AGI-2 | — | 84.6% |
| Kagi LLM Benchmark | 67.2% | — |
| NYT Connections (extended) | 8.2% | — |
| ARC-AGI-1 | — | 96% |
| Chess Puzzles | 25% | — |
| EnigmaEval | 3% | — |
| Thematic Generalization | 63.3% | — |
| LMArena Hard Prompts | 1407 | — |
| DTBench | 76.8% | — |
| LMCA | 35% | — |
| Epoch Capabilities Index | 144.45 | — |
| ForecastBench | 54.4 | — |

## Math

- Gemini 3.1 Flash Lite: 39.5 (#82)
- Gemini 3 Deep Think: —

| Benchmark | Gemini 3.1 Flash Lite | Gemini 3 Deep Think |
|---|---|---|
| FrontierMath (Tiers 1-3) | 27.7% | — |
| OTIS Mock AIME 2024-2025 | 80% | — |
| LMArena Math | 1427 | — |

## Knowledge

- Gemini 3.1 Flash Lite: 41.7 (#95)
- Gemini 3 Deep Think: —

| Benchmark | Gemini 3.1 Flash Lite | Gemini 3 Deep Think |
|---|---|---|
| GPQA Diamond | 81.8% | — |
| Humanity's Last Exam | 8.6% | — |
| Vectara Hallucination Rate | 8.2% | — |
| LMArena Expert | 1397 | — |

## Multimodal

- Gemini 3.1 Flash Lite: 38.7 (#57)
- Gemini 3 Deep Think: —

| Benchmark | Gemini 3.1 Flash Lite | Gemini 3 Deep Think |
|---|---|---|
| LMArena Vision | 1240 | — |

## Multilingual

- Gemini 3.1 Flash Lite: 52.5 (#82)
- Gemini 3 Deep Think: —

| Benchmark | Gemini 3.1 Flash Lite | Gemini 3 Deep Think |
|---|---|---|
| LMArena Non-English | 1410 | — |
| LMArena Chinese | 1461 | — |
| LMArena French | 1423 | — |
| LMArena German | 1429 | — |
| LMArena Japanese | 1411 | — |
| LMArena Korean | 1393 | — |
| LMArena Russian | 1420 | — |
| LMArena Spanish | 1420 | — |

## Instruction Following

- Gemini 3.1 Flash Lite: 72.9 (#126)
- Gemini 3 Deep Think: —

| Benchmark | Gemini 3.1 Flash Lite | Gemini 3 Deep Think |
|---|---|---|
| LMArena Instruction Following | 1376 | — |

## Long Context

- Gemini 3.1 Flash Lite: 42.5 (#117)
- Gemini 3 Deep Think: —

| Benchmark | Gemini 3.1 Flash Lite | Gemini 3 Deep Think |
|---|---|---|
| LMArena Longer Query | 1394 | — |

## Writing & Preference

- Gemini 3.1 Flash Lite: 61.0 (#90)
- Gemini 3 Deep Think: —

| Benchmark | Gemini 3.1 Flash Lite | Gemini 3 Deep Think |
|---|---|---|
| LMArena Text | 1416 | — |
| LMArena Creative Writing | 1401 | — |
| LMArena Multi-Turn | 1417 | — |

## FAQ

### Is Gemini 3.1 Flash Lite better than Gemini 3 Deep Think?

Gemini 3.1 Flash Lite has enough public results to be ranked (#141); Gemini 3 Deep Think does not yet, so treat this comparison as directional.

### How many benchmarks do Gemini 3.1 Flash Lite and Gemini 3 Deep Think share?

1 benchmark has published results for both models. Gemini 3.1 Flash Lite has 38 scored results on Noometry and Gemini 3 Deep Think has 3.