Model comparison
Gemini 3.1 Flash Lite vs Grok 4.1 Fast
Gemini 3.1 Flash Lite and Grok 4.1 Fast score almost the same on the Noometry Index (40.4 vs 40.9), so choose on price, context window or the category you care about most.
Last verified . 24 shared benchmarks.
GoogleSummary
- They share 24 benchmarks with published results for both. Gemini 3.1 Flash Lite scores higher in 8 categories and Grok 4.1 Fast in 2 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where Grok 4.1 Fast leads 42.3 to 22.3.
- The biggest single-benchmark swing is NYT Connections (extended): 8.2% for Gemini 3.1 Flash Lite and 87.4% for Grok 4.1 Fast.
- Grok 4.1 Fast is cheaper at $0.20 / $0.50 per million input/output tokens, against $0.25 / $1.50 for Gemini 3.1 Flash Lite.
- Gemini 3.1 Flash Lite accepts more context: 1.05M tokens versus 128K.
Side by side
| Gemini 3.1 Flash Lite | Grok 4.1 Fast | |
|---|---|---|
| Provider | xAI | |
| Noometry Index | 40.4 | 40.9 |
| Released | 2026-03-03 | 2025-06-27 |
| Weights | Proprietary | Proprietary |
| Context window | 1.05M | 128K |
| Max output | 66K | 30K |
| Input $ / M tokens | $0.25 | $0.20 |
| Output $ / M tokens | $1.50 | $0.50 |
| Results tracked | 38 | 32 |
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Category by category
Coding Gemini 3.1 Flash Lite leads
Gemini 3.1 Flash Lite: 37.5 (#179), Grok 4.1 Fast: 33.8 (#236)
| Benchmark | Gemini 3.1 Flash Lite | Grok 4.1 Fast |
|---|---|---|
| LMArena WebDev | 1256 | 1241 |
| LMArena Coding | 1400 | 1411 |
| ALE-Bench | 797.73 | 394.93 |
| SciCode | 41.9% | — |
| WeirdML | 52.2% | — |
Agentic & Tool Use Grok 4.1 Fast leads
Gemini 3.1 Flash Lite: 29.9 (#72), Grok 4.1 Fast: 36.1 (#35)
| Benchmark | Gemini 3.1 Flash Lite | Grok 4.1 Fast |
|---|---|---|
| Berkeley Function Calling Leaderboard | — | 69.6% |
| τ²-bench Banking | — | 13.1% |
| DeepResearch Bench | 37.3% | — |
| LMArena Search | — | 1171 |
| Vending-Bench 2 | — | 1,107 |
Reasoning Grok 4.1 Fast leads
Gemini 3.1 Flash Lite: 22.3 (#181), Grok 4.1 Fast: 42.3 (#45)
| Benchmark | Gemini 3.1 Flash Lite | Grok 4.1 Fast |
|---|---|---|
| NYT Connections (extended) | 8.2% | 87.4% |
| LMArena Hard Prompts | 1407 | 1407 |
| DTBench | 76.8% | 87.7% |
| ForecastBench | 54.4 | 61 |
| SimpleBench | — | 56% |
| Kagi LLM Benchmark | 67.2% | — |
| CritPt | 1.1% | — |
| Chess Puzzles | 25% | — |
| EnigmaEval | 3% | — |
| Thematic Generalization | 63.3% | — |
| LMCA | 35% | — |
| Epoch Capabilities Index | 144.45 | — |
Math Gemini 3.1 Flash Lite leads
Gemini 3.1 Flash Lite: 39.5 (#82), Grok 4.1 Fast: 30.9 (#201)
| Benchmark | Gemini 3.1 Flash Lite | Grok 4.1 Fast |
|---|---|---|
| LMArena Math | 1427 | 1408 |
| FrontierMath (Tiers 1-3) | 27.7% | — |
| MathArena Final-Answer Competitions | — | 60.9% |
| OTIS Mock AIME 2024-2025 | 80% | — |
| ProofBench | — | 4% |
Knowledge Gemini 3.1 Flash Lite leads
Gemini 3.1 Flash Lite: 41.7 (#95), Grok 4.1 Fast: 32.6 (#203)
| Benchmark | Gemini 3.1 Flash Lite | Grok 4.1 Fast |
|---|---|---|
| Vectara Hallucination Rate | 8.2% | 17.8% |
| LMArena Expert | 1397 | 1398 |
| GPQA Diamond | 81.8% | — |
| Humanity's Last Exam | 8.6% | — |
Multimodal Gemini 3.1 Flash Lite leads
Gemini 3.1 Flash Lite: 38.7 (#57), Grok 4.1 Fast: 36.3 (#71)
| Benchmark | Gemini 3.1 Flash Lite | Grok 4.1 Fast |
|---|---|---|
| LMArena Vision | 1240 | 1201 |
Multilingual Gemini 3.1 Flash Lite leads
Gemini 3.1 Flash Lite: 52.5 (#82), Grok 4.1 Fast: 51.1 (#110)
| Benchmark | Gemini 3.1 Flash Lite | Grok 4.1 Fast |
|---|---|---|
| LMArena Non-English | 1410 | 1391 |
| LMArena Chinese | 1461 | 1441 |
| LMArena French | 1423 | 1416 |
| LMArena German | 1429 | 1404 |
| LMArena Japanese | 1411 | 1347 |
| LMArena Korean | 1393 | 1361 |
| LMArena Russian | 1420 | 1387 |
| LMArena Spanish | 1420 | 1411 |
Instruction Following Too close to call
Gemini 3.1 Flash Lite: 72.9 (#126), Grok 4.1 Fast: 72.8 (#127)
| Benchmark | Gemini 3.1 Flash Lite | Grok 4.1 Fast |
|---|---|---|
| LMArena Instruction Following | 1376 | 1376 |
Long Context Too close to call
Gemini 3.1 Flash Lite: 42.5 (#117), Grok 4.1 Fast: 42.4 (#121)
| Benchmark | Gemini 3.1 Flash Lite | Grok 4.1 Fast |
|---|---|---|
| LMArena Longer Query | 1394 | 1390 |
Writing & Preference Gemini 3.1 Flash Lite leads
Gemini 3.1 Flash Lite: 61.0 (#90), Grok 4.1 Fast: 57.4 (#126)
| Benchmark | Gemini 3.1 Flash Lite | Grok 4.1 Fast |
|---|---|---|
| LMArena Text | 1416 | 1408 |
| LMArena Creative Writing | 1401 | 1394 |
| LMArena Multi-Turn | 1417 | 1389 |
| EQ-Bench Creative Writing | — | 1327 |
Frequently asked questions
Is Gemini 3.1 Flash Lite better than Grok 4.1 Fast?
Gemini 3.1 Flash Lite and Grok 4.1 Fast score almost the same on the Noometry Index (40.4 vs 40.9), so choose on price, context window or the category you care about most.
Which is cheaper, Gemini 3.1 Flash Lite or Grok 4.1 Fast?
Grok 4.1 Fast is cheaper. It lists at $0.20 per million input tokens and $0.50 per million output tokens; Gemini 3.1 Flash Lite lists at $0.25 and $1.50.
Is Gemini 3.1 Flash Lite or Grok 4.1 Fast better for coding?
Gemini 3.1 Flash Lite scores higher on coding benchmarks: 37.5 versus 33.8 in the Noometry coding category.
Which has the bigger context window?
Gemini 3.1 Flash Lite does, with 1.05M tokens against 128K.
How many benchmarks do Gemini 3.1 Flash Lite and Grok 4.1 Fast share?
24 benchmarks have published results for both models. Gemini 3.1 Flash Lite has 38 scored results on Noometry and Grok 4.1 Fast has 32.