# Gemini 3.1 Flash Lite vs o3

> o3 is the stronger model overall, scoring 47.5 to 40.8 on the Noometry Index. Gemini 3.1 Flash Lite costs 6.2× less per token, which makes it the better buy when o3's lead doesn't matter for your workload.

- Canonical page: https://noometry.com/compare/gemini-3-1-flash-lite-vs-o3
- Last updated: 2026-10-11
- Shared benchmarks: 33

## Summary

- They share 33 benchmarks with published results for both. Gemini 3.1 Flash Lite scores higher in 1 category and o3 in 9 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in knowledge, where o3 leads 54.6 to 41.9.
- The biggest single-benchmark swing is Chess Puzzles: 25% for Gemini 3.1 Flash Lite and 38% for o3.
- Gemini 3.1 Flash Lite is cheaper at $0.25 / $1.50 per million input/output tokens, against $2 / $8 for o3.
- Gemini 3.1 Flash Lite accepts more context: 1.05M tokens versus 200K.

## Snapshot

| | Gemini 3.1 Flash Lite | o3 |
|---|---|---|
| Provider | Google | OpenAI |
| Noometry Index | 40.8 | 47.5 |
| Rank | 144 | 61 |
| Context | 1.05M | 200K |
| Input $/M | $0.25 | $2 |
| Output $/M | $1.50 | $8 |
| Weights | Proprietary | Proprietary |

## Coding

- Gemini 3.1 Flash Lite: 37.8 (#188)
- o3: 46.8 (#64)

| Benchmark | Gemini 3.1 Flash Lite | o3 |
|---|---|---|
| WeirdML | 52.2% | 52.4% |
| LMArena Coding | 1400 | 1408 |
| ALE-Bench | 797.73 | 933.55 |
| SWE-bench Verified | — | 62.3% |
| SWE-bench Verified (bash only) | — | 58.4% |
| Aider Polyglot | — | 81.3% |
| LMArena WebDev | 1256 | — |
| SciCode | 41.9% | — |
| GSO | — | 8.8% |
| CadEval | — | 74% |

## Agentic & Tool Use

- Gemini 3.1 Flash Lite: 30.2 (#79)
- o3: 34.5 (#44)

| Benchmark | Gemini 3.1 Flash Lite | o3 |
|---|---|---|
| DeepResearch Bench | 37.3% | 45.2% |
| Berkeley Function Calling Leaderboard | — | 63% |
| GDPval | — | 30.8% |
| OSWorld | — | 23% |
| LMArena Search | — | 1144 |
| METR Time Horizons | — | 65.4% |

## Reasoning

- Gemini 3.1 Flash Lite: 22.9 (#186)
- o3: 32.0 (#78)

| Benchmark | Gemini 3.1 Flash Lite | o3 |
|---|---|---|
| Kagi LLM Benchmark | 67.2% | 67.6% |
| CritPt | 1.1% | 1.4% |
| Chess Puzzles | 25% | 38% |
| EnigmaEval | 3% | 13.1% |
| LMArena Hard Prompts | 1407 | 1402 |
| DTBench | 76.8% | 84.8% |
| LMCA | 35% | 39.7% |
| Epoch Capabilities Index | 144.47 | 146.86 |
| ForecastBench | 54.4 | 62.5 |
| ARC-AGI-2 | — | 6.5% |
| SimpleBench | — | 53.1% |
| NYT Connections (extended) | 8.2% | — |
| ARC-AGI-1 | — | 60.8% |
| Thematic Generalization | 63.3% | — |
| Mystery Game Puzzles | — | 29% |

## Math

- Gemini 3.1 Flash Lite: 40.7 (#90)
- o3: 50.2 (#58)

| Benchmark | Gemini 3.1 Flash Lite | o3 |
|---|---|---|
| FrontierMath (Tiers 1-3) | 27.7% | 33.3% |
| OTIS Mock AIME 2024-2025 | 80% | 84.4% |
| LMArena Math | 1428 | 1426 |
| Omni-MATH | — | 71.4% |
| MATH Level 5 | — | 97.8% |
| FrontierMath (Feb 2025 set) | — | 18.7% |
| FrontierMath Tier 4 (v1) | — | 2.1% |

## Knowledge

- Gemini 3.1 Flash Lite: 41.9 (#104)
- o3: 54.6 (#52)

| Benchmark | Gemini 3.1 Flash Lite | o3 |
|---|---|---|
| GPQA Diamond | 81.8% | 81.8% |
| Humanity's Last Exam | 8.6% | 20.3% |
| LMArena Expert | 1398 | 1402 |
| SimpleQA Verified | — | 49.4% |
| MMLU-Pro | — | 85.9% |
| Confabulations | — | 14.4% |
| Vectara Hallucination Rate | 8.2% | — |
| GPQA (HELM) | — | 75.3% |

## Multimodal

- Gemini 3.1 Flash Lite: 39.4 (#60)
- o3: 41.4 (#36)

| Benchmark | Gemini 3.1 Flash Lite | o3 |
|---|---|---|
| LMArena Vision | 1240 | 1214 |
| GeoBench | — | 74% |
| VPCT | — | 52% |

## Multilingual

- Gemini 3.1 Flash Lite: 52.3 (#86)
- o3: 51.7 (#105)

| Benchmark | Gemini 3.1 Flash Lite | o3 |
|---|---|---|
| LMArena Non-English | 1411 | 1401 |
| LMArena Chinese | 1461 | 1437 |
| LMArena French | 1424 | 1430 |
| LMArena German | 1429 | 1420 |
| LMArena Japanese | 1413 | 1403 |
| LMArena Korean | 1392 | 1370 |
| LMArena Russian | 1420 | 1406 |
| LMArena Spanish | 1421 | 1395 |

## Instruction Following

- Gemini 3.1 Flash Lite: 72.7 (#131)
- o3: 72.8 (#127)

| Benchmark | Gemini 3.1 Flash Lite | o3 |
|---|---|---|
| LMArena Instruction Following | 1377 | 1368 |
| IFEval | — | 86.9% |

## Long Context

- Gemini 3.1 Flash Lite: 42.5 (#122)
- o3: 53.3 (#6)

| Benchmark | Gemini 3.1 Flash Lite | o3 |
|---|---|---|
| LMArena Longer Query | 1394 | 1372 |
| Fiction.LiveBench | — | 88.9% |
| CL-bench | — | 17.8% |

## Writing & Preference

- Gemini 3.1 Flash Lite: 60.9 (#94)
- o3: 63.5 (#64)

| Benchmark | Gemini 3.1 Flash Lite | o3 |
|---|---|---|
| LMArena Text | 1416 | 1410 |
| LMArena Creative Writing | 1401 | 1359 |
| LMArena Multi-Turn | 1417 | 1405 |
| Short-Story Creative Writing | — | 83.9% |
| EQ-Bench Creative Writing | — | 1676 |
| WildBench | — | 86.1% |

## FAQ

### Is Gemini 3.1 Flash Lite better than o3?

o3 is the stronger model overall, scoring 47.5 to 40.8 on the Noometry Index. Gemini 3.1 Flash Lite costs 6.2× less per token, which makes it the better buy when o3's lead doesn't matter for your workload.

### Which is cheaper, Gemini 3.1 Flash Lite or o3?

Gemini 3.1 Flash Lite is cheaper. It lists at $0.25 per million input tokens and $1.50 per million output tokens; o3 lists at $2 and $8.

### Is Gemini 3.1 Flash Lite or o3 better for coding?

o3 scores higher on coding benchmarks: 46.8 versus 37.8 in the Noometry coding category.

### Which has the bigger context window?

Gemini 3.1 Flash Lite does, with 1.05M tokens against 200K.

### How many benchmarks do Gemini 3.1 Flash Lite and o3 share?

33 benchmarks have published results for both models. Gemini 3.1 Flash Lite has 38 scored results on Noometry and o3 has 63.