# Gemini 3.1 Flash Lite vs Grok 4.20 Multi-Agent

> Grok 4.20 Multi-Agent is the stronger model overall, scoring 45.5 to 40.4 on the Noometry Index. Gemini 3.1 Flash Lite costs 2.8× less per token, which makes it the better buy when Grok 4.20 Multi-Agent's lead doesn't matter for your workload.

- Canonical page: https://noometry.com/compare/gemini-3-1-flash-lite-vs-grok-4-20-multi-agent
- Last updated: 2026-10-10
- Shared benchmarks: 19

## Summary

- They share 19 benchmarks with published results for both. Gemini 3.1 Flash Lite scores higher in 2 categories and Grok 4.20 Multi-Agent in 7 categories; 9 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where Grok 4.20 Multi-Agent leads 42.4 to 22.3.
- The biggest single-benchmark swing is NYT Connections (extended): 8.2% for Gemini 3.1 Flash Lite and 89.6% for Grok 4.20 Multi-Agent.
- Gemini 3.1 Flash Lite is cheaper at $0.25 / $1.50 per million input/output tokens, against $1.25 / $2.50 for Grok 4.20 Multi-Agent.
- Gemini 3.1 Flash Lite accepts more context: 1.05M tokens versus 1M.

## Snapshot

| | Gemini 3.1 Flash Lite | Grok 4.20 Multi-Agent |
|---|---|---|
| Provider | Google | xAI |
| Noometry Index | 40.4 | 45.5 |
| Rank | 141 | 62 |
| Context | 1.05M | 1M |
| Input $/M | $0.25 | $1.25 |
| Output $/M | $1.50 | $2.50 |
| Weights | Proprietary | Proprietary |

## Coding

- Gemini 3.1 Flash Lite: 37.5 (#179)
- Grok 4.20 Multi-Agent: 42.4 (#91)

| Benchmark | Gemini 3.1 Flash Lite | Grok 4.20 Multi-Agent |
|---|---|---|
| LMArena Coding | 1400 | 1458 |
| LMArena WebDev | 1256 | — |
| SciCode | 41.9% | — |
| WeirdML | 52.2% | — |
| ALE-Bench | 797.73 | — |

## Agentic & Tool Use

- Gemini 3.1 Flash Lite: 29.9 (#72)
- Grok 4.20 Multi-Agent: —

| Benchmark | Gemini 3.1 Flash Lite | Grok 4.20 Multi-Agent |
|---|---|---|
| DeepResearch Bench | 37.3% | — |
| LMArena Search | — | 1204 |

## Reasoning

- Gemini 3.1 Flash Lite: 22.3 (#181)
- Grok 4.20 Multi-Agent: 42.4 (#44)

| Benchmark | Gemini 3.1 Flash Lite | Grok 4.20 Multi-Agent |
|---|---|---|
| NYT Connections (extended) | 8.2% | 89.6% |
| LMArena Hard Prompts | 1407 | 1448 |
| Kagi LLM Benchmark | 67.2% | — |
| CritPt | 1.1% | — |
| Chess Puzzles | 25% | — |
| EnigmaEval | 3% | — |
| Thematic Generalization | 63.3% | — |
| DTBench | 76.8% | — |
| LMCA | 35% | — |
| Epoch Capabilities Index | 144.45 | — |
| ForecastBench | 54.4 | — |

## Math

- Gemini 3.1 Flash Lite: 39.5 (#82)
- Grok 4.20 Multi-Agent: 36.6 (#106)

| Benchmark | Gemini 3.1 Flash Lite | Grok 4.20 Multi-Agent |
|---|---|---|
| LMArena Math | 1427 | 1441 |
| FrontierMath (Tiers 1-3) | 27.7% | — |
| OTIS Mock AIME 2024-2025 | 80% | — |

## Knowledge

- Gemini 3.1 Flash Lite: 41.7 (#95)
- Grok 4.20 Multi-Agent: 39.7 (#116)

| Benchmark | Gemini 3.1 Flash Lite | Grok 4.20 Multi-Agent |
|---|---|---|
| LMArena Expert | 1397 | 1445 |
| GPQA Diamond | 81.8% | — |
| Humanity's Last Exam | 8.6% | — |
| Vectara Hallucination Rate | 8.2% | — |

## Multimodal

- Gemini 3.1 Flash Lite: 38.7 (#57)
- Grok 4.20 Multi-Agent: 39.8 (#44)

| Benchmark | Gemini 3.1 Flash Lite | Grok 4.20 Multi-Agent |
|---|---|---|
| LMArena Vision | 1240 | 1259 |

## Multilingual

- Gemini 3.1 Flash Lite: 52.5 (#82)
- Grok 4.20 Multi-Agent: 54.6 (#40)

| Benchmark | Gemini 3.1 Flash Lite | Grok 4.20 Multi-Agent |
|---|---|---|
| LMArena Non-English | 1410 | 1440 |
| LMArena Chinese | 1461 | 1475 |
| LMArena French | 1423 | 1467 |
| LMArena German | 1429 | 1456 |
| LMArena Japanese | 1411 | 1405 |
| LMArena Korean | 1393 | 1416 |
| LMArena Russian | 1420 | 1457 |
| LMArena Spanish | 1420 | 1447 |

## Instruction Following

- Gemini 3.1 Flash Lite: 72.9 (#126)
- Grok 4.20 Multi-Agent: 75.0 (#80)

| Benchmark | Gemini 3.1 Flash Lite | Grok 4.20 Multi-Agent |
|---|---|---|
| LMArena Instruction Following | 1376 | 1420 |

## Long Context

- Gemini 3.1 Flash Lite: 42.5 (#117)
- Grok 4.20 Multi-Agent: 43.7 (#84)

| Benchmark | Gemini 3.1 Flash Lite | Grok 4.20 Multi-Agent |
|---|---|---|
| LMArena Longer Query | 1394 | 1430 |

## Writing & Preference

- Gemini 3.1 Flash Lite: 61.0 (#90)
- Grok 4.20 Multi-Agent: 64.1 (#57)

| Benchmark | Gemini 3.1 Flash Lite | Grok 4.20 Multi-Agent |
|---|---|---|
| LMArena Text | 1416 | 1450 |
| LMArena Creative Writing | 1401 | 1435 |
| LMArena Multi-Turn | 1417 | 1451 |

## FAQ

### Is Gemini 3.1 Flash Lite better than Grok 4.20 Multi-Agent?

Grok 4.20 Multi-Agent is the stronger model overall, scoring 45.5 to 40.4 on the Noometry Index. Gemini 3.1 Flash Lite costs 2.8× less per token, which makes it the better buy when Grok 4.20 Multi-Agent's lead doesn't matter for your workload.

### Which is cheaper, Gemini 3.1 Flash Lite or Grok 4.20 Multi-Agent?

Gemini 3.1 Flash Lite is cheaper. It lists at $0.25 per million input tokens and $1.50 per million output tokens; Grok 4.20 Multi-Agent lists at $1.25 and $2.50.

### Is Gemini 3.1 Flash Lite or Grok 4.20 Multi-Agent better for coding?

Grok 4.20 Multi-Agent scores higher on coding benchmarks: 42.4 versus 37.5 in the Noometry coding category.

### Which has the bigger context window?

Gemini 3.1 Flash Lite does, with 1.05M tokens against 1M.

### How many benchmarks do Gemini 3.1 Flash Lite and Grok 4.20 Multi-Agent share?

19 benchmarks have published results for both models. Gemini 3.1 Flash Lite has 38 scored results on Noometry and Grok 4.20 Multi-Agent has 20.