Noometry

Model comparison

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.

Last verified . 19 shared benchmarks.

Grok 4.1 Fast xAI

40.9

Rank #131 Confirmed

Nova 2 Lite Amazon

39.0

Rank #161 Confirmed

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.

Side by side

Grok 4.1 FastNova 2 Lite
ProviderxAIAmazon
Noometry Index40.939.0
Released2025-06-272025-12-01
WeightsProprietaryProprietary
Context window128K1M
Max output30K64K
Input $ / M tokens$0.20$0.30
Output $ / M tokens$0.50$2.50
Results tracked3219

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Category by category

Coding Nova 2 Lite leads

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

BenchmarkGrok 4.1 FastNova 2 Lite
LMArena Coding14111386
LMArena WebDev1241—
ALE-Bench394.93—

Agentic & Tool Use Grok 4.1 Fast leads

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

BenchmarkGrok 4.1 FastNova 2 Lite
Berkeley Function Calling Leaderboard69.6%27.1%
τ²-bench Banking13.1%—
LMArena Search1171—
Vending-Bench 21,107—

Reasoning Grok 4.1 Fast leads

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

BenchmarkGrok 4.1 FastNova 2 Lite
LMArena Hard Prompts14071364
SimpleBench56%—
NYT Connections (extended)87.4%—
DTBench87.7%—
ForecastBench61—

Math Nova 2 Lite leads

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

BenchmarkGrok 4.1 FastNova 2 Lite
LMArena Math14081359
MathArena Final-Answer Competitions60.9%—
ProofBench4%—

Knowledge Nova 2 Lite leads

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

BenchmarkGrok 4.1 FastNova 2 Lite
Vectara Hallucination Rate17.8%5.1%
LMArena Expert13981360

Multimodal Not comparable

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

BenchmarkGrok 4.1 FastNova 2 Lite
LMArena Vision1201—

Multilingual Grok 4.1 Fast leads

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

BenchmarkGrok 4.1 FastNova 2 Lite
LMArena Non-English13911337
LMArena Chinese14411364
LMArena French14161381
LMArena German14041343
LMArena Japanese13471273
LMArena Korean13611284
LMArena Russian13871343
LMArena Spanish14111372

Instruction Following Grok 4.1 Fast leads

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

BenchmarkGrok 4.1 FastNova 2 Lite
LMArena Instruction Following13761335

Long Context Grok 4.1 Fast leads

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

BenchmarkGrok 4.1 FastNova 2 Lite
LMArena Longer Query13901335

Writing & Preference Grok 4.1 Fast leads

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

BenchmarkGrok 4.1 FastNova 2 Lite
LMArena Text14081362
LMArena Creative Writing13941291
LMArena Multi-Turn13891338
EQ-Bench Creative Writing1327—

Frequently asked questions

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.

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