Model comparison
Gemini 3.5 Flash Lite vs Grok 4 Fast
Gemini 3.5 Flash Lite is the stronger model overall, scoring 41.8 to 39.0 on the Noometry Index.
Last verified . 23 shared benchmarks.
GoogleSummary
- They share 23 benchmarks with published results for both. Gemini 3.5 Flash Lite scores higher in 6 categories and Grok 4 Fast in 3 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in long context, where Grok 4 Fast leads 63.2 to 43.8.
- The biggest single-benchmark swing is ARC-AGI-1: 53.5% for Gemini 3.5 Flash Lite and 48.5% for Grok 4 Fast.
Side by side
| Gemini 3.5 Flash Lite | Grok 4 Fast | |
|---|---|---|
| Provider | xAI | |
| Noometry Index | 41.8 | 39.0 |
| Released | 2026-07-21 | 2025-09-19 |
| Weights | Proprietary | Proprietary |
| Context window | 1.05M | — |
| Max output | 66K | — |
| Input $ / M tokens | $0.30 | — |
| Output $ / M tokens | $2.50 | — |
| Results tracked | 38 | 30 |
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Category by category
Coding Gemini 3.5 Flash Lite leads
Gemini 3.5 Flash Lite: 42.1 (#96), Grok 4 Fast: 32.3 (#264)
| Benchmark | Gemini 3.5 Flash Lite | Grok 4 Fast |
|---|---|---|
| LMArena WebDev | 1440 | 1160 |
| WeirdML | 39% | 42.9% |
| LMArena Coding | 1455 | 1429 |
| SciCode | 41.3% | — |
| ALE-Bench | 765.27 | — |
Agentic & Tool Use Too close to call
Gemini 3.5 Flash Lite: 28.6 (#82), Grok 4 Fast: 29.3 (#80)
| Benchmark | Gemini 3.5 Flash Lite | Grok 4 Fast |
|---|---|---|
| τ²-bench Banking | — | 15.7% |
| Cybench | — | 30% |
| GDP.pdf | 10% | — |
| LMArena Search | — | 1171 |
Reasoning Gemini 3.5 Flash Lite leads
Gemini 3.5 Flash Lite: 27.8 (#95), Grok 4 Fast: 22.5 (#179)
| Benchmark | Gemini 3.5 Flash Lite | Grok 4 Fast |
|---|---|---|
| ARC-AGI-2 | 10.3% | 5.3% |
| ARC-AGI-1 | 53.5% | 48.5% |
| LMArena Hard Prompts | 1441 | 1413 |
| DTBench | 83.5% | 82.7% |
| Epoch Capabilities Index | 145.12 | 144.21 |
| Kagi LLM Benchmark | — | 66.1% |
| NYT Connections (extended) | 60.4% | — |
| CritPt | 0% | — |
| Chess Puzzles | 22% | — |
| Mystery Game Puzzles | 19% | — |
| LMCA | 37.6% | — |
| ForecastBench | — | 60.5 |
Math Grok 4 Fast leads
Gemini 3.5 Flash Lite: 25.7 (#245), Grok 4 Fast: 36.1 (#126)
| Benchmark | Gemini 3.5 Flash Lite | Grok 4 Fast |
|---|---|---|
| LMArena Math | 1431 | 1419 |
| FrontierMath (Tiers 1-3) | 26% | — |
| FrontierMath Tier 4 | 0% | — |
| OTIS Mock AIME 2024-2025 | 71.1% | — |
| ProofBench | 13% | — |
Knowledge Gemini 3.5 Flash Lite leads
Gemini 3.5 Flash Lite: 50.0 (#66), Grok 4 Fast: 31.5 (#211)
| Benchmark | Gemini 3.5 Flash Lite | Grok 4 Fast |
|---|---|---|
| LMArena Expert | 1430 | 1411 |
| GPQA Diamond | 83.3% | — |
| Vectara Hallucination Rate | — | 19.7% |
Multimodal Not comparable
Gemini 3.5 Flash Lite: 40.3 (#38), Grok 4 Fast: —
| Benchmark | Gemini 3.5 Flash Lite | Grok 4 Fast |
|---|---|---|
| LMArena Vision | 1266 | — |
Multilingual Gemini 3.5 Flash Lite leads
Gemini 3.5 Flash Lite: 53.8 (#59), Grok 4 Fast: 51.5 (#106)
| Benchmark | Gemini 3.5 Flash Lite | Grok 4 Fast |
|---|---|---|
| LMArena Non-English | 1428 | 1397 |
| LMArena Chinese | 1467 | 1458 |
| LMArena French | 1452 | 1433 |
| LMArena German | 1454 | 1383 |
| LMArena Japanese | 1428 | 1358 |
| LMArena Korean | 1406 | 1359 |
| LMArena Russian | 1443 | 1387 |
| LMArena Spanish | 1440 | 1414 |
Instruction Following Gemini 3.5 Flash Lite leads
Gemini 3.5 Flash Lite: 75.0 (#77), Grok 4 Fast: 73.4 (#116)
| Benchmark | Gemini 3.5 Flash Lite | Grok 4 Fast |
|---|---|---|
| LMArena Instruction Following | 1420 | 1388 |
Long Context Grok 4 Fast leads
Gemini 3.5 Flash Lite: 43.8 (#80), Grok 4 Fast: 63.2 (#3)
| Benchmark | Gemini 3.5 Flash Lite | Grok 4 Fast |
|---|---|---|
| LMArena Longer Query | 1435 | 1415 |
| Fiction.LiveBench | — | 94.4% |
Writing & Preference Gemini 3.5 Flash Lite leads
Gemini 3.5 Flash Lite: 64.4 (#55), Grok 4 Fast: 60.2 (#96)
| Benchmark | Gemini 3.5 Flash Lite | Grok 4 Fast |
|---|---|---|
| LMArena Text | 1436 | 1407 |
| LMArena Creative Writing | 1419 | 1388 |
| LMArena Multi-Turn | 1445 | 1414 |
| EQ-Bench Creative Writing | 1559 | — |
Frequently asked questions
Is Gemini 3.5 Flash Lite better than Grok 4 Fast?
Gemini 3.5 Flash Lite is the stronger model overall, scoring 41.8 to 39.0 on the Noometry Index.
Is Gemini 3.5 Flash Lite or Grok 4 Fast better for coding?
Gemini 3.5 Flash Lite scores higher on coding benchmarks: 42.1 versus 32.3 in the Noometry coding category.
How many benchmarks do Gemini 3.5 Flash Lite and Grok 4 Fast share?
23 benchmarks have published results for both models. Gemini 3.5 Flash Lite has 38 scored results on Noometry and Grok 4 Fast has 30.