# Gemini 3.1 Flash Lite vs Gemini 3.1 Pro Preview

> Gemini 3.1 Pro Preview is the stronger model overall, scoring 56.7 to 40.8 on the Noometry Index. Gemini 3.1 Flash Lite costs 8.0× less per token, which makes it the better buy when Gemini 3.1 Pro Preview's lead doesn't matter for your workload.

- Canonical page: https://noometry.com/compare/gemini-3-1-flash-lite-vs-gemini-3-1-pro-preview
- Last updated: 2026-10-12
- Shared benchmarks: 37

## Summary

- They share 37 benchmarks with published results for both. Gemini 3.1 Flash Lite scores higher in 1 category and Gemini 3.1 Pro Preview in 9 categories; 10 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where Gemini 3.1 Pro Preview leads 71.7 to 22.9.
- The biggest single-benchmark swing is NYT Connections (extended): 8.2% for Gemini 3.1 Flash Lite and 97.4% for Gemini 3.1 Pro Preview.
- Gemini 3.1 Flash Lite is cheaper at $0.25 / $1.50 per million input/output tokens, against $2 / $12 for Gemini 3.1 Pro Preview.

## Snapshot

| | Gemini 3.1 Flash Lite | Gemini 3.1 Pro Preview |
|---|---|---|
| Provider | Google | Google |
| Noometry Index | 40.8 | 56.7 |
| Rank | 144 | 23 |
| Context | 1.05M | 1.05M |
| Input $/M | $0.25 | $2 |
| Output $/M | $1.50 | $12 |
| Weights | Proprietary | Proprietary |

## Coding

- Gemini 3.1 Flash Lite: 37.8 (#188)
- Gemini 3.1 Pro Preview: 42.5 (#99)

| Benchmark | Gemini 3.1 Flash Lite | Gemini 3.1 Pro Preview |
|---|---|---|
| LMArena WebDev | 1256 | 1447 |
| SciCode | 41.9% | 58.9% |
| WeirdML | 52.2% | 72.1% |
| LMArena Coding | 1400 | 1484 |
| ALE-Bench | 797.73 | 1,161 |
| SWE-bench Verified | — | 75.6% |
| DeepSWE | — | 11.7% |
| GSO | — | 22.6% |
| MirrorCode | — | 8.9% |
| AlgoTune | — | 2.02 |

## Agentic & Tool Use

- Gemini 3.1 Flash Lite: 30.2 (#79)
- Gemini 3.1 Pro Preview: 37.7 (#34)

| Benchmark | Gemini 3.1 Flash Lite | Gemini 3.1 Pro Preview |
|---|---|---|
| DeepResearch Bench | 37.3% | 47.8% |
| Terminal-Bench | — | 80.2% |
| APEX-Agents | — | 35.3% |
| τ²-bench Banking | — | 26% |
| PostTrainBench | — | 22% |
| BALROG | — | 57% |
| ExploitBench | — | 26.1% |
| GBAEval | — | 0.8% |
| GDP.pdf | — | 17% |
| LMArena Search | — | 1211 |
| METR Time Horizons | — | 77% |
| Vending-Bench 2 | — | 3,774 |

## Reasoning

- Gemini 3.1 Flash Lite: 22.9 (#186)
- Gemini 3.1 Pro Preview: 71.7 (#12)

| Benchmark | Gemini 3.1 Flash Lite | Gemini 3.1 Pro Preview |
|---|---|---|
| NYT Connections (extended) | 8.2% | 97.4% |
| CritPt | 1.1% | 17.7% |
| Chess Puzzles | 25% | 55% |
| EnigmaEval | 3% | 36.8% |
| Thematic Generalization | 63.3% | 79.4% |
| LMArena Hard Prompts | 1407 | 1485 |
| DTBench | 76.8% | 97.1% |
| LMCA | 35% | 53.8% |
| Epoch Capabilities Index | 144.47 | 154.77 |
| ForecastBench | 54.4 | 59 |
| ARC-AGI-2 | — | 77.1% |
| SimpleBench | — | 79.6% |
| Kagi LLM Benchmark | 67.2% | — |
| ARC-AGI-1 | — | 98% |
| EBR-Bench | — | 14.3% |
| Mystery Game Puzzles | — | 34% |

## Math

- Gemini 3.1 Flash Lite: 40.7 (#90)
- Gemini 3.1 Pro Preview: 62.1 (#34)

| Benchmark | Gemini 3.1 Flash Lite | Gemini 3.1 Pro Preview |
|---|---|---|
| FrontierMath (Tiers 1-3) | 27.7% | 59.6% |
| OTIS Mock AIME 2024-2025 | 80% | 95.6% |
| LMArena Math | 1428 | 1485 |
| FrontierMath Tier 4 | — | 26.8% |
| MathArena Final-Answer Competitions | — | 86.5% |
| ProofBench | — | 26% |
| FrontierMath (Feb 2025 set) | — | 36.9% |
| FrontierMath Tier 4 (v1) | — | 16.7% |

## Knowledge

- Gemini 3.1 Flash Lite: 41.9 (#104)
- Gemini 3.1 Pro Preview: 71.8 (#3)

| Benchmark | Gemini 3.1 Flash Lite | Gemini 3.1 Pro Preview |
|---|---|---|
| GPQA Diamond | 81.8% | 94.4% |
| Humanity's Last Exam | 8.6% | 46.4% |
| Vectara Hallucination Rate | 8.2% | 10.4% |
| LMArena Expert | 1398 | 1485 |
| SimpleQA Verified | — | 73.5% |

## Multimodal

- Gemini 3.1 Flash Lite: 39.4 (#60)
- Gemini 3.1 Pro Preview: 37.9 (#69)

| Benchmark | Gemini 3.1 Flash Lite | Gemini 3.1 Pro Preview |
|---|---|---|
| LMArena Vision | 1240 | 1296 |
| Blueprint-Bench 2 | — | 26.5% |
| Furniture Assembly | — | 26.7% |
| LMArena Document | — | 1444 |

## Multilingual

- Gemini 3.1 Flash Lite: 52.3 (#86)
- Gemini 3.1 Pro Preview: 57.0 (#12)

| Benchmark | Gemini 3.1 Flash Lite | Gemini 3.1 Pro Preview |
|---|---|---|
| LMArena Non-English | 1411 | 1477 |
| LMArena Chinese | 1461 | 1529 |
| LMArena French | 1424 | 1487 |
| LMArena German | 1429 | 1491 |
| LMArena Japanese | 1413 | 1493 |
| LMArena Korean | 1392 | 1455 |
| LMArena Russian | 1420 | 1498 |
| LMArena Spanish | 1421 | 1479 |

## Instruction Following

- Gemini 3.1 Flash Lite: 72.7 (#131)
- Gemini 3.1 Pro Preview: 77.0 (#32)

| Benchmark | Gemini 3.1 Flash Lite | Gemini 3.1 Pro Preview |
|---|---|---|
| LMArena Instruction Following | 1377 | 1466 |

## Long Context

- Gemini 3.1 Flash Lite: 42.5 (#122)
- Gemini 3.1 Pro Preview: 47.4 (#18)

| Benchmark | Gemini 3.1 Flash Lite | Gemini 3.1 Pro Preview |
|---|---|---|
| LMArena Longer Query | 1394 | 1483 |
| CL-bench | — | 20.8% |
| CL-bench Life | — | 16.9% |

## Writing & Preference

- Gemini 3.1 Flash Lite: 60.9 (#94)
- Gemini 3.1 Pro Preview: 66.1 (#37)

| Benchmark | Gemini 3.1 Flash Lite | Gemini 3.1 Pro Preview |
|---|---|---|
| LMArena Text | 1416 | 1481 |
| LMArena Creative Writing | 1401 | 1482 |
| LMArena Multi-Turn | 1417 | 1488 |
| EQ-Bench Creative Writing | — | 1491 |
| EQ-Bench 4 | — | 1142 |

## FAQ

### Is Gemini 3.1 Flash Lite better than Gemini 3.1 Pro Preview?

Gemini 3.1 Pro Preview is the stronger model overall, scoring 56.7 to 40.8 on the Noometry Index. Gemini 3.1 Flash Lite costs 8.0× less per token, which makes it the better buy when Gemini 3.1 Pro Preview's lead doesn't matter for your workload.

### Which is cheaper, Gemini 3.1 Flash Lite or Gemini 3.1 Pro Preview?

Gemini 3.1 Flash Lite is cheaper. It lists at $0.25 per million input tokens and $1.50 per million output tokens; Gemini 3.1 Pro Preview lists at $2 and $12.

### Is Gemini 3.1 Flash Lite or Gemini 3.1 Pro Preview better for coding?

Gemini 3.1 Pro Preview scores higher on coding benchmarks: 42.5 versus 37.8 in the Noometry coding category.

### Which has the bigger context window?

Both accept 1.05M tokens.

### How many benchmarks do Gemini 3.1 Flash Lite and Gemini 3.1 Pro Preview share?

37 benchmarks have published results for both models. Gemini 3.1 Flash Lite has 38 scored results on Noometry and Gemini 3.1 Pro Preview has 71.