Model comparison
Gemini 3 Flash Preview vs Grok 4 Fast
Gemini 3 Flash Preview is the stronger model overall, scoring 52.3 to 39.4 on the Noometry Index.
Last verified . 27 shared benchmarks.
GoogleSummary
- They share 27 benchmarks with published results for both. Gemini 3 Flash Preview scores higher in 8 categories and Grok 4 Fast in 1 category; 9 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where Gemini 3 Flash Preview leads 49.2 to 22.2.
- The biggest single-benchmark swing is ARC-AGI-1: 84.7% for Gemini 3 Flash Preview and 48.5% for Grok 4 Fast.
Side by side
| Gemini 3 Flash Preview | Grok 4 Fast | |
|---|---|---|
| Provider | xAI | |
| Noometry Index | 52.3 | 39.4 |
| Released | 2025-12-17 | 2025-09-19 |
| Weights | Proprietary | Proprietary |
| Context window | 1.05M | — |
| Max output | 66K | — |
| Input $ / M tokens | $0.50 | — |
| Output $ / M tokens | $3 | — |
| Results tracked | 59 | 30 |
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Category by category
Coding Gemini 3 Flash Preview leads
Gemini 3 Flash Preview: 50.9 (#42), Grok 4 Fast: 32.5 (#271)
| Benchmark | Gemini 3 Flash Preview | Grok 4 Fast |
|---|---|---|
| LMArena WebDev | 1439 | 1159 |
| WeirdML | 61.6% | 42.9% |
| LMArena Coding | 1460 | 1429 |
| SWE-bench Verified | 75.4% | — |
| SWE-bench Verified (bash only) | 75.8% | — |
| SWE-bench Multilingual | 72.7% | — |
| GSO | 9.8% | — |
| ALE-Bench | 1,367 | — |
Agentic & Tool Use Gemini 3 Flash Preview leads
Gemini 3 Flash Preview: 38.7 (#29), Grok 4 Fast: 29.5 (#86)
| Benchmark | Gemini 3 Flash Preview | Grok 4 Fast |
|---|---|---|
| τ²-bench Banking | 27.3% | 15.7% |
| LMArena Search | 1198 | 1171 |
| Terminal-Bench | 64.3% | — |
| τ²-bench Airline | 82.5% | — |
| τ²-bench Retail | 76.8% | — |
| τ²-bench Telecom | 91.2% | — |
| Cybench | — | 30% |
| DeepResearch Bench | 49.8% | — |
| BALROG | 48.1% | — |
| GDP.pdf | 10% | — |
| Vending-Bench 2 | 3,635 | — |
Reasoning Gemini 3 Flash Preview leads
Gemini 3 Flash Preview: 49.2 (#37), Grok 4 Fast: 22.2 (#201)
| Benchmark | Gemini 3 Flash Preview | Grok 4 Fast |
|---|---|---|
| ARC-AGI-2 | 33.6% | 5.3% |
| ARC-AGI-1 | 84.7% | 48.5% |
| LMArena Hard Prompts | 1465 | 1412 |
| DTBench | 89.1% | 82.7% |
| Epoch Capabilities Index | 151.8 | 144.2 |
| ForecastBench | 58.5 | 60.5 |
| SimpleBench | 61.1% | — |
| Kagi LLM Benchmark | — | 66.1% |
| NYT Connections (extended) | 83.1% | — |
| Chess Puzzles | 40% | — |
| Mystery Game Puzzles | 26% | — |
| LMCA | 43.1% | — |
Math Gemini 3 Flash Preview leads
Gemini 3 Flash Preview: 51.7 (#55), Grok 4 Fast: 38.9 (#123)
| Benchmark | Gemini 3 Flash Preview | Grok 4 Fast |
|---|---|---|
| LMArena Math | 1473 | 1419 |
| FrontierMath (Tiers 1-3) | 51.2% | — |
| FrontierMath Tier 4 | 17.1% | — |
| MathArena Final-Answer Competitions | 67.6% | — |
| OTIS Mock AIME 2024-2025 | 95.6% | — |
| ProofBench | 15% | — |
| FrontierMath (Feb 2025 set) | 35.6% | — |
| FrontierMath Tier 4 (v1) | 4.2% | — |
Knowledge Gemini 3 Flash Preview leads
Gemini 3 Flash Preview: 58.8 (#33), Grok 4 Fast: 32.0 (#214)
| Benchmark | Gemini 3 Flash Preview | Grok 4 Fast |
|---|---|---|
| Vectara Hallucination Rate | 13.5% | 19.7% |
| LMArena Expert | 1462 | 1411 |
| GPQA Diamond | 89.4% | — |
| SimpleQA Verified | 66.8% | — |
Multimodal Not comparable
Gemini 3 Flash Preview: 45.5 (#16), Grok 4 Fast: —
| Benchmark | Gemini 3 Flash Preview | Grok 4 Fast |
|---|---|---|
| LMArena Vision | 1285 | — |
| GeoBench | 88% | — |
| VPCT | 72.6% | — |
| Blueprint-Bench 2 | 0% | — |
| LMArena Document | 1413 | — |
Multilingual Gemini 3 Flash Preview leads
Gemini 3 Flash Preview: 55.7 (#27), Grok 4 Fast: 51.3 (#111)
| Benchmark | Gemini 3 Flash Preview | Grok 4 Fast |
|---|---|---|
| LMArena Non-English | 1458 | 1396 |
| LMArena Chinese | 1511 | 1457 |
| LMArena French | 1477 | 1431 |
| LMArena German | 1497 | 1383 |
| LMArena Japanese | 1489 | 1352 |
| LMArena Korean | 1443 | 1357 |
| LMArena Russian | 1480 | 1389 |
| LMArena Spanish | 1469 | 1415 |
Instruction Following Gemini 3 Flash Preview leads
Gemini 3 Flash Preview: 75.7 (#56), Grok 4 Fast: 73.2 (#121)
| Benchmark | Gemini 3 Flash Preview | Grok 4 Fast |
|---|---|---|
| LMArena Instruction Following | 1437 | 1387 |
Long Context Grok 4 Fast leads
Gemini 3 Flash Preview: 44.4 (#67), Grok 4 Fast: 63.2 (#3)
| Benchmark | Gemini 3 Flash Preview | Grok 4 Fast |
|---|---|---|
| LMArena Longer Query | 1452 | 1415 |
| Fiction.LiveBench | — | 94.4% |
Writing & Preference Gemini 3 Flash Preview leads
Gemini 3 Flash Preview: 65.5 (#45), Grok 4 Fast: 60.0 (#102)
| Benchmark | Gemini 3 Flash Preview | Grok 4 Fast |
|---|---|---|
| LMArena Text | 1466 | 1407 |
| LMArena Creative Writing | 1457 | 1387 |
| LMArena Multi-Turn | 1471 | 1414 |
Frequently asked questions
Is Gemini 3 Flash Preview better than Grok 4 Fast?
Gemini 3 Flash Preview is the stronger model overall, scoring 52.3 to 39.4 on the Noometry Index.
Is Gemini 3 Flash Preview or Grok 4 Fast better for coding?
Gemini 3 Flash Preview scores higher on coding benchmarks: 50.9 versus 32.5 in the Noometry coding category.
How many benchmarks do Gemini 3 Flash Preview and Grok 4 Fast share?
27 benchmarks have published results for both models. Gemini 3 Flash Preview has 59 scored results on Noometry and Grok 4 Fast has 30.