Model comparison
Gemini 3 Flash Preview vs Grok 4.5
Grok 4.5 is the stronger model overall, scoring 55.0 to 52.3 on the Noometry Index. Gemini 3 Flash Preview costs 2.7× less per token, which makes it the better buy when Grok 4.5's lead doesn't matter for your workload.
Last verified . 41 shared benchmarks.
GoogleSummary
- They share 41 benchmarks with published results for both. Gemini 3 Flash Preview scores higher in 2 categories and Grok 4.5 in 8 categories; 7 gaps are clear of the uncertainty.
- The widest gap is in math, where Grok 4.5 leads 60.9 to 51.7.
- The biggest single-benchmark swing is Blueprint-Bench 2: 0% for Gemini 3 Flash Preview and 27.3% for Grok 4.5.
- Gemini 3 Flash Preview is cheaper at $0.50 / $3 per million input/output tokens, against $2 / $6 for Grok 4.5.
- Gemini 3 Flash Preview accepts more context: 1.05M tokens versus 500K.
Side by side
| Gemini 3 Flash Preview | Grok 4.5 | |
|---|---|---|
| Provider | xAI | |
| Noometry Index | 52.3 | 55.0 |
| Released | 2025-12-17 | 2026-07-08 |
| Weights | Proprietary | Proprietary |
| Context window | 1.05M | 500K |
| Max output | 66K | 500K |
| Input $ / M tokens | $0.50 | $2 |
| Output $ / M tokens | $3 | $6 |
| Results tracked | 59 | 52 |
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Category by category
Coding Grok 4.5 leads
Gemini 3 Flash Preview: 50.9 (#42), Grok 4.5: 52.2 (#35)
| Benchmark | Gemini 3 Flash Preview | Grok 4.5 |
|---|---|---|
| LMArena WebDev | 1439 | 1553 |
| WeirdML | 61.6% | 46.4% |
| LMArena Coding | 1460 | 1474 |
| ALE-Bench | 1,367 | 1,309 |
| SWE-bench Verified | 75.4% | — |
| DeepSWE | — | 53.8% |
| FrontierCode | — | 42.4% |
| SWE-bench Verified (bash only) | 75.8% | — |
| SWE-bench Multilingual | 72.7% | — |
| SciCode | — | 54.1% |
| GSO | 9.8% | — |
Agentic & Tool Use Grok 4.5 leads
Gemini 3 Flash Preview: 38.7 (#29), Grok 4.5: 44.4 (#17)
| Benchmark | Gemini 3 Flash Preview | Grok 4.5 |
|---|---|---|
| τ²-bench Banking | 27.3% | 47.9% |
| GDP.pdf | 10% | 14% |
| LMArena Search | 1198 | 1213 |
| Vending-Bench 2 | 3,635 | 3,887 |
| Terminal-Bench | 64.3% | — |
| APEX-Agents | — | 56.2% |
| τ²-bench Airline | 82.5% | — |
| τ²-bench Retail | 76.8% | — |
| τ²-bench Telecom | 91.2% | — |
| DeepResearch Bench | 49.8% | — |
| PostTrainBench | — | 23.4% |
| BALROG | 48.1% | — |
| GBAEval | — | 65.4% |
Reasoning Grok 4.5 leads
Gemini 3 Flash Preview: 49.2 (#37), Grok 4.5: 56.1 (#25)
| Benchmark | Gemini 3 Flash Preview | Grok 4.5 |
|---|---|---|
| ARC-AGI-2 | 33.6% | 52.6% |
| SimpleBench | 61.1% | 70% |
| NYT Connections (extended) | 83.1% | 79.9% |
| ARC-AGI-1 | 84.7% | 87.2% |
| Chess Puzzles | 40% | 36% |
| LMArena Hard Prompts | 1465 | 1462 |
| DTBench | 89.1% | 96.5% |
| LMCA | 43.1% | 45.2% |
| Epoch Capabilities Index | 151.8 | 153.92 |
| Kagi LLM Benchmark | — | 83.5% |
| CritPt | — | 15.4% |
| Mystery Game Puzzles | 26% | — |
| Surface Evolver Bench | — | 74.4% |
| ForecastBench | 58.5 | — |
Math Grok 4.5 leads
Gemini 3 Flash Preview: 51.7 (#55), Grok 4.5: 60.9 (#35)
| Benchmark | Gemini 3 Flash Preview | Grok 4.5 |
|---|---|---|
| FrontierMath (Tiers 1-3) | 51.2% | 57.2% |
| FrontierMath Tier 4 | 17.1% | 24.4% |
| OTIS Mock AIME 2024-2025 | 95.6% | 97.8% |
| ProofBench | 15% | 31% |
| LMArena Math | 1473 | 1459 |
| MathArena Final-Answer Competitions | 67.6% | — |
| FrontierMath (Feb 2025 set) | 35.6% | — |
| FrontierMath Tier 4 (v1) | 4.2% | — |
Knowledge Grok 4.5 leads
Gemini 3 Flash Preview: 58.8 (#33), Grok 4.5: 62.3 (#24)
| Benchmark | Gemini 3 Flash Preview | Grok 4.5 |
|---|---|---|
| GPQA Diamond | 89.4% | 93.4% |
| SimpleQA Verified | 66.8% | 48.3% |
| LMArena Expert | 1462 | 1466 |
| Vectara Hallucination Rate | 13.5% | — |
Multimodal Gemini 3 Flash Preview leads
Gemini 3 Flash Preview: 45.5 (#16), Grok 4.5: 37.6 (#72)
| Benchmark | Gemini 3 Flash Preview | Grok 4.5 |
|---|---|---|
| LMArena Vision | 1285 | 1288 |
| Blueprint-Bench 2 | 0% | 27.3% |
| LMArena Document | 1413 | 1452 |
| GeoBench | 88% | — |
| VPCT | 72.6% | — |
| Furniture Assembly | — | 22.5% |
Multilingual Gemini 3 Flash Preview leads
Gemini 3 Flash Preview: 55.7 (#27), Grok 4.5: 54.4 (#42)
| Benchmark | Gemini 3 Flash Preview | Grok 4.5 |
|---|---|---|
| LMArena Non-English | 1458 | 1440 |
| LMArena Chinese | 1511 | 1496 |
| LMArena French | 1477 | 1456 |
| LMArena German | 1497 | 1446 |
| LMArena Japanese | 1489 | 1428 |
| LMArena Korean | 1443 | 1404 |
| LMArena Russian | 1480 | 1448 |
| LMArena Spanish | 1469 | 1450 |
Instruction Following Too close to call
Gemini 3 Flash Preview: 75.7 (#56), Grok 4.5: 76.0 (#48)
| Benchmark | Gemini 3 Flash Preview | Grok 4.5 |
|---|---|---|
| LMArena Instruction Following | 1437 | 1446 |
Long Context Too close to call
Gemini 3 Flash Preview: 44.4 (#67), Grok 4.5: 44.8 (#56)
| Benchmark | Gemini 3 Flash Preview | Grok 4.5 |
|---|---|---|
| LMArena Longer Query | 1452 | 1463 |
Writing & Preference Too close to call
Gemini 3 Flash Preview: 65.5 (#45), Grok 4.5: 65.8 (#42)
| Benchmark | Gemini 3 Flash Preview | Grok 4.5 |
|---|---|---|
| LMArena Text | 1466 | 1448 |
| LMArena Creative Writing | 1457 | 1442 |
| LMArena Multi-Turn | 1471 | 1456 |
| EQ-Bench Creative Writing | — | 1579 |
Frequently asked questions
Is Gemini 3 Flash Preview better than Grok 4.5?
Grok 4.5 is the stronger model overall, scoring 55.0 to 52.3 on the Noometry Index. Gemini 3 Flash Preview costs 2.7× less per token, which makes it the better buy when Grok 4.5's lead doesn't matter for your workload.
Which is cheaper, Gemini 3 Flash Preview or Grok 4.5?
Gemini 3 Flash Preview is cheaper. It lists at $0.50 per million input tokens and $3 per million output tokens; Grok 4.5 lists at $2 and $6.
Is Gemini 3 Flash Preview or Grok 4.5 better for coding?
Grok 4.5 scores higher on coding benchmarks: 52.2 versus 50.9 in the Noometry coding category.
Which has the bigger context window?
Gemini 3 Flash Preview does, with 1.05M tokens against 500K.
How many benchmarks do Gemini 3 Flash Preview and Grok 4.5 share?
41 benchmarks have published results for both models. Gemini 3 Flash Preview has 59 scored results on Noometry and Grok 4.5 has 52.