# Grok 4.1 Fast vs Nova 2 Lite

> Grok 4.1 Fast is the stronger model overall, scoring 40.9 to 39.0 on the Noometry Index.

- Canonical page: https://noometry.com/compare/grok-4-1-fast-vs-nova-2-lite
- Last updated: 2026-10-10
- Shared benchmarks: 19

## Summary

- They share 19 benchmarks with published results for both. Grok 4.1 Fast scores higher in 6 categories and Nova 2 Lite in 3 categories; 9 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where Grok 4.1 Fast leads 42.3 to 26.4.
- The biggest single-benchmark swing is Berkeley Function Calling Leaderboard: 69.6% for Grok 4.1 Fast and 27.1% for Nova 2 Lite.
- Grok 4.1 Fast is cheaper at $0.20 / $0.50 per million input/output tokens, against $0.30 / $2.50 for Nova 2 Lite.
- Nova 2 Lite accepts more context: 1M tokens versus 128K.

## Snapshot

| | Grok 4.1 Fast | Nova 2 Lite |
|---|---|---|
| Provider | xAI | Amazon |
| Noometry Index | 40.9 | 39.0 |
| Rank | 131 | 161 |
| Context | 128K | 1M |
| Input $/M | $0.20 | $0.30 |
| Output $/M | $0.50 | $2.50 |
| Weights | Proprietary | Proprietary |

## Coding

- Grok 4.1 Fast: 33.8 (#236)
- Nova 2 Lite: 40.1 (#131)

| Benchmark | Grok 4.1 Fast | Nova 2 Lite |
|---|---|---|
| LMArena Coding | 1411 | 1386 |
| LMArena WebDev | 1241 | — |
| ALE-Bench | 394.93 | — |

## Agentic & Tool Use

- Grok 4.1 Fast: 36.1 (#35)
- Nova 2 Lite: 23.9 (#114)

| Benchmark | Grok 4.1 Fast | Nova 2 Lite |
|---|---|---|
| Berkeley Function Calling Leaderboard | 69.6% | 27.1% |
| τ²-bench Banking | 13.1% | — |
| LMArena Search | 1171 | — |
| Vending-Bench 2 | 1,107 | — |

## Reasoning

- Grok 4.1 Fast: 42.3 (#45)
- Nova 2 Lite: 26.4 (#120)

| Benchmark | Grok 4.1 Fast | Nova 2 Lite |
|---|---|---|
| LMArena Hard Prompts | 1407 | 1364 |
| SimpleBench | 56% | — |
| NYT Connections (extended) | 87.4% | — |
| DTBench | 87.7% | — |
| ForecastBench | 61 | — |

## Math

- Grok 4.1 Fast: 30.9 (#201)
- Nova 2 Lite: 34.8 (#154)

| Benchmark | Grok 4.1 Fast | Nova 2 Lite |
|---|---|---|
| LMArena Math | 1408 | 1359 |
| MathArena Final-Answer Competitions | 60.9% | — |
| ProofBench | 4% | — |

## Knowledge

- Grok 4.1 Fast: 32.6 (#203)
- Nova 2 Lite: 42.5 (#88)

| Benchmark | Grok 4.1 Fast | Nova 2 Lite |
|---|---|---|
| Vectara Hallucination Rate | 17.8% | 5.1% |
| LMArena Expert | 1398 | 1360 |

## Multimodal

- Grok 4.1 Fast: 36.3 (#71)
- Nova 2 Lite: —

| Benchmark | Grok 4.1 Fast | Nova 2 Lite |
|---|---|---|
| LMArena Vision | 1201 | — |

## Multilingual

- Grok 4.1 Fast: 51.1 (#110)
- Nova 2 Lite: 47.3 (#148)

| Benchmark | Grok 4.1 Fast | Nova 2 Lite |
|---|---|---|
| LMArena Non-English | 1391 | 1337 |
| LMArena Chinese | 1441 | 1364 |
| LMArena French | 1416 | 1381 |
| LMArena German | 1404 | 1343 |
| LMArena Japanese | 1347 | 1273 |
| LMArena Korean | 1361 | 1284 |
| LMArena Russian | 1387 | 1343 |
| LMArena Spanish | 1411 | 1372 |

## Instruction Following

- Grok 4.1 Fast: 72.8 (#127)
- Nova 2 Lite: 70.7 (#156)

| Benchmark | Grok 4.1 Fast | Nova 2 Lite |
|---|---|---|
| LMArena Instruction Following | 1376 | 1335 |

## Long Context

- Grok 4.1 Fast: 42.4 (#121)
- Nova 2 Lite: 40.6 (#145)

| Benchmark | Grok 4.1 Fast | Nova 2 Lite |
|---|---|---|
| LMArena Longer Query | 1390 | 1335 |

## Writing & Preference

- Grok 4.1 Fast: 57.4 (#126)
- Nova 2 Lite: 54.1 (#150)

| Benchmark | Grok 4.1 Fast | Nova 2 Lite |
|---|---|---|
| LMArena Text | 1408 | 1362 |
| LMArena Creative Writing | 1394 | 1291 |
| LMArena Multi-Turn | 1389 | 1338 |
| EQ-Bench Creative Writing | 1327 | — |

## FAQ

### Is Grok 4.1 Fast better than Nova 2 Lite?

Grok 4.1 Fast is the stronger model overall, scoring 40.9 to 39.0 on the Noometry Index.

### Which is cheaper, Grok 4.1 Fast or Nova 2 Lite?

Grok 4.1 Fast is cheaper. It lists at $0.20 per million input tokens and $0.50 per million output tokens; Nova 2 Lite lists at $0.30 and $2.50.

### Is Grok 4.1 Fast or Nova 2 Lite better for coding?

Nova 2 Lite scores higher on coding benchmarks: 40.1 versus 33.8 in the Noometry coding category.

### Which has the bigger context window?

Nova 2 Lite does, with 1M tokens against 128K.

### How many benchmarks do Grok 4.1 Fast and Nova 2 Lite share?

19 benchmarks have published results for both models. Grok 4.1 Fast has 32 scored results on Noometry and Nova 2 Lite has 19.