Model comparison
Gemini 3 Flash Preview vs Grok 4.1 Fast
Gemini 3 Flash Preview is the stronger model overall, scoring 52.3 to 41.4 on the Noometry Index. Grok 4.1 Fast costs 4.1× less per token, which makes it the better buy when Gemini 3 Flash Preview's lead doesn't matter for your workload.
Last verified . 30 shared benchmarks.
GoogleSummary
- They share 30 benchmarks with published results for both. Gemini 3 Flash Preview scores higher in 10 categories and Grok 4.1 Fast in 0 categories; 10 gaps are clear of the uncertainty.
- The widest gap is in knowledge, where Gemini 3 Flash Preview leads 58.8 to 33.1.
- The biggest single-benchmark swing is τ²-bench Banking: 27.3% for Gemini 3 Flash Preview and 13.1% for Grok 4.1 Fast.
- Grok 4.1 Fast is cheaper at $0.20 / $0.50 per million input/output tokens, against $0.50 / $3 for Gemini 3 Flash Preview.
- Gemini 3 Flash Preview accepts more context: 1.05M tokens versus 128K.
Side by side
| Gemini 3 Flash Preview | Grok 4.1 Fast | |
|---|---|---|
| Provider | xAI | |
| Noometry Index | 52.3 | 41.4 |
| Released | 2025-12-17 | 2025-06-27 |
| Weights | Proprietary | Proprietary |
| Context window | 1.05M | 128K |
| Max output | 66K | 30K |
| Input $ / M tokens | $0.50 | $0.20 |
| Output $ / M tokens | $3 | $0.50 |
| Results tracked | 59 | 32 |
Sponsored placements are available on pages like this one. Advertise on Noometry
Category by category
Coding Gemini 3 Flash Preview leads
Gemini 3 Flash Preview: 50.9 (#42), Grok 4.1 Fast: 34.1 (#245)
| Benchmark | Gemini 3 Flash Preview | Grok 4.1 Fast |
|---|---|---|
| LMArena WebDev | 1439 | 1242 |
| LMArena Coding | 1460 | 1411 |
| ALE-Bench | 1,367 | 394.93 |
| SWE-bench Verified | 75.4% | — |
| SWE-bench Verified (bash only) | 75.8% | — |
| SWE-bench Multilingual | 72.7% | — |
| GSO | 9.8% | — |
| WeirdML | 61.6% | — |
Agentic & Tool Use Gemini 3 Flash Preview leads
Gemini 3 Flash Preview: 38.7 (#29), Grok 4.1 Fast: 36.3 (#39)
| Benchmark | Gemini 3 Flash Preview | Grok 4.1 Fast |
|---|---|---|
| τ²-bench Banking | 27.3% | 13.1% |
| LMArena Search | 1198 | 1171 |
| Vending-Bench 2 | 3,635 | 1,107 |
| Terminal-Bench | 64.3% | — |
| Berkeley Function Calling Leaderboard | — | 69.6% |
| τ²-bench Airline | 82.5% | — |
| τ²-bench Retail | 76.8% | — |
| τ²-bench Telecom | 91.2% | — |
| DeepResearch Bench | 49.8% | — |
| BALROG | 48.1% | — |
| GDP.pdf | 10% | — |
Reasoning Gemini 3 Flash Preview leads
Gemini 3 Flash Preview: 49.2 (#37), Grok 4.1 Fast: 43.4 (#49)
| Benchmark | Gemini 3 Flash Preview | Grok 4.1 Fast |
|---|---|---|
| SimpleBench | 61.1% | 56% |
| NYT Connections (extended) | 83.1% | 87.4% |
| LMArena Hard Prompts | 1465 | 1407 |
| DTBench | 89.1% | 87.7% |
| ForecastBench | 58.5 | 61 |
| ARC-AGI-2 | 33.6% | — |
| ARC-AGI-1 | 84.7% | — |
| Chess Puzzles | 40% | — |
| Mystery Game Puzzles | 26% | — |
| LMCA | 43.1% | — |
| Epoch Capabilities Index | 151.8 | — |
Math Gemini 3 Flash Preview leads
Gemini 3 Flash Preview: 51.7 (#55), Grok 4.1 Fast: 31.9 (#221)
| Benchmark | Gemini 3 Flash Preview | Grok 4.1 Fast |
|---|---|---|
| MathArena Final-Answer Competitions | 67.6% | 60.9% |
| ProofBench | 15% | 4% |
| LMArena Math | 1473 | 1408 |
| FrontierMath (Tiers 1-3) | 51.2% | — |
| FrontierMath Tier 4 | 17.1% | — |
| OTIS Mock AIME 2024-2025 | 95.6% | — |
| 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 4.1 Fast: 33.1 (#207)
| Benchmark | Gemini 3 Flash Preview | Grok 4.1 Fast |
|---|---|---|
| Vectara Hallucination Rate | 13.5% | 17.8% |
| LMArena Expert | 1462 | 1399 |
| GPQA Diamond | 89.4% | — |
| SimpleQA Verified | 66.8% | — |
Multimodal Gemini 3 Flash Preview leads
Gemini 3 Flash Preview: 45.5 (#16), Grok 4.1 Fast: 37.0 (#76)
| Benchmark | Gemini 3 Flash Preview | Grok 4.1 Fast |
|---|---|---|
| LMArena Vision | 1285 | 1201 |
| 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 4.1 Fast: 51.0 (#114)
| Benchmark | Gemini 3 Flash Preview | Grok 4.1 Fast |
|---|---|---|
| LMArena Non-English | 1458 | 1391 |
| LMArena Chinese | 1511 | 1441 |
| LMArena French | 1477 | 1415 |
| LMArena German | 1497 | 1404 |
| LMArena Japanese | 1489 | 1349 |
| LMArena Korean | 1443 | 1361 |
| LMArena Russian | 1480 | 1387 |
| LMArena Spanish | 1469 | 1413 |
Instruction Following Gemini 3 Flash Preview leads
Gemini 3 Flash Preview: 75.7 (#56), Grok 4.1 Fast: 72.7 (#133)
| Benchmark | Gemini 3 Flash Preview | Grok 4.1 Fast |
|---|---|---|
| LMArena Instruction Following | 1437 | 1376 |
Long Context Gemini 3 Flash Preview leads
Gemini 3 Flash Preview: 44.4 (#67), Grok 4.1 Fast: 42.4 (#126)
| Benchmark | Gemini 3 Flash Preview | Grok 4.1 Fast |
|---|---|---|
| LMArena Longer Query | 1452 | 1390 |
Writing & Preference Gemini 3 Flash Preview leads
Gemini 3 Flash Preview: 65.5 (#45), Grok 4.1 Fast: 57.2 (#131)
| Benchmark | Gemini 3 Flash Preview | Grok 4.1 Fast |
|---|---|---|
| LMArena Text | 1466 | 1408 |
| LMArena Creative Writing | 1457 | 1394 |
| LMArena Multi-Turn | 1471 | 1389 |
| EQ-Bench Creative Writing | — | 1327 |
Frequently asked questions
Is Gemini 3 Flash Preview better than Grok 4.1 Fast?
Gemini 3 Flash Preview is the stronger model overall, scoring 52.3 to 41.4 on the Noometry Index. Grok 4.1 Fast costs 4.1× less per token, which makes it the better buy when Gemini 3 Flash Preview's lead doesn't matter for your workload.
Which is cheaper, Gemini 3 Flash Preview 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 Flash Preview lists at $0.50 and $3.
Is Gemini 3 Flash Preview or Grok 4.1 Fast better for coding?
Gemini 3 Flash Preview scores higher on coding benchmarks: 50.9 versus 34.1 in the Noometry coding category.
Which has the bigger context window?
Gemini 3 Flash Preview does, with 1.05M tokens against 128K.
How many benchmarks do Gemini 3 Flash Preview and Grok 4.1 Fast share?
30 benchmarks have published results for both models. Gemini 3 Flash Preview has 59 scored results on Noometry and Grok 4.1 Fast has 32.