Model comparison
Gemini 1.5 Flash (May 2024) vs Grok 4 Fast
Grok 4 Fast is the stronger model overall, scoring 39.4 to 33.2 on the Noometry Index.
Last verified . 21 shared benchmarks.
GoogleSummary
- They share 21 benchmarks with published results for both. Gemini 1.5 Flash (May 2024) scores higher in 1 category and Grok 4 Fast in 8 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in long context, where Grok 4 Fast leads 63.2 to 39.0.
- The biggest single-benchmark swing is DTBench: 53.8% for Gemini 1.5 Flash (May 2024) and 82.7% for Grok 4 Fast.
Side by side
| Gemini 1.5 Flash (May 2024) | Grok 4 Fast | |
|---|---|---|
| Provider | xAI | |
| Noometry Index | 33.2 | 39.4 |
| Released | 2024-05-14 | 2025-09-19 |
| Weights | Proprietary | Proprietary |
| Context window | — | — |
| Max output | — | — |
| Input $ / M tokens | — | — |
| Output $ / M tokens | — | — |
| Results tracked | 42 | 30 |
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Category by category
Coding Gemini 1.5 Flash (May 2024) leads
Gemini 1.5 Flash (May 2024): 34.4 (#236), Grok 4 Fast: 32.5 (#271)
| Benchmark | Gemini 1.5 Flash (May 2024) | Grok 4 Fast |
|---|---|---|
| WeirdML | 24.9% | 42.9% |
| LMArena Coding | 1261 | 1429 |
| LMArena WebDev | — | 1159 |
| BigCodeBench Instruct | 43.5% | — |
| BigCodeBench Complete | 55.1% | — |
| HumanEval+ | 75.6% | — |
| MBPP+ | 67.5% | — |
Agentic & Tool Use Grok 4 Fast leads
Gemini 1.5 Flash (May 2024): 26.6 (#102), Grok 4 Fast: 29.5 (#86)
| Benchmark | Gemini 1.5 Flash (May 2024) | Grok 4 Fast |
|---|---|---|
| τ²-bench Banking | — | 15.7% |
| Cybench | — | 30% |
| BALROG | 14.6% | — |
| LMArena Search | — | 1171 |
Reasoning Too close to call
Gemini 1.5 Flash (May 2024): 21.7 (#215), Grok 4 Fast: 22.2 (#201)
| Benchmark | Gemini 1.5 Flash (May 2024) | Grok 4 Fast |
|---|---|---|
| LMArena Hard Prompts | 1257 | 1412 |
| DTBench | 53.8% | 82.7% |
| Epoch Capabilities Index | 129.36 | 144.2 |
| ForecastBench | 53.9 | 60.5 |
| ARC-AGI-2 | — | 5.3% |
| Kagi LLM Benchmark | — | 66.1% |
| ARC-AGI-1 | — | 48.5% |
| PIQA | 87.5% | — |
Math Grok 4 Fast leads
Gemini 1.5 Flash (May 2024): 22.1 (#281), Grok 4 Fast: 38.9 (#123)
| Benchmark | Gemini 1.5 Flash (May 2024) | Grok 4 Fast |
|---|---|---|
| LMArena Math | 1269 | 1419 |
| OTIS Mock AIME 2024-2025 | 16.3% | — |
| Omni-MATH | 30.4% | — |
| MATH Level 5 | 61.9% | — |
| FrontierMath (Feb 2025 set) | 0% | — |
| GSM8K | 82.4% | — |
Knowledge Grok 4 Fast leads
Gemini 1.5 Flash (May 2024): 26.2 (#260), Grok 4 Fast: 32.0 (#214)
| Benchmark | Gemini 1.5 Flash (May 2024) | Grok 4 Fast |
|---|---|---|
| LMArena Expert | 1233 | 1411 |
| GPQA Diamond | 47.3% | — |
| MMLU-Pro | 67.8% | — |
| Vectara Hallucination Rate | — | 19.7% |
| GPQA (HELM) | 43.7% | — |
| BoolQ | 85.8% | — |
| MMLU | 77.9% | — |
Multimodal Not comparable
Gemini 1.5 Flash (May 2024): 36.0 (#81), Grok 4 Fast: —
| Benchmark | Gemini 1.5 Flash (May 2024) | Grok 4 Fast |
|---|---|---|
| LMArena Vision | 1141 | — |
| Video-MME | 70.3% | — |
| GeoBench | 76% | — |
Multilingual Grok 4 Fast leads
Gemini 1.5 Flash (May 2024): 42.9 (#189), Grok 4 Fast: 51.3 (#111)
| Benchmark | Gemini 1.5 Flash (May 2024) | Grok 4 Fast |
|---|---|---|
| LMArena Non-English | 1278 | 1396 |
| LMArena Chinese | 1295 | 1457 |
| LMArena French | 1258 | 1431 |
| LMArena German | 1262 | 1383 |
| LMArena Japanese | 1252 | 1352 |
| LMArena Korean | 1221 | 1357 |
| LMArena Russian | 1288 | 1389 |
| LMArena Spanish | 1243 | 1415 |
Instruction Following Grok 4 Fast leads
Gemini 1.5 Flash (May 2024): 66.8 (#205), Grok 4 Fast: 73.2 (#121)
| Benchmark | Gemini 1.5 Flash (May 2024) | Grok 4 Fast |
|---|---|---|
| LMArena Instruction Following | 1258 | 1387 |
| IFEval | 83.1% | — |
Long Context Grok 4 Fast leads
Gemini 1.5 Flash (May 2024): 39.0 (#187), Grok 4 Fast: 63.2 (#3)
| Benchmark | Gemini 1.5 Flash (May 2024) | Grok 4 Fast |
|---|---|---|
| LMArena Longer Query | 1284 | 1415 |
| Fiction.LiveBench | — | 94.4% |
Writing & Preference Grok 4 Fast leads
Gemini 1.5 Flash (May 2024): 48.7 (#196), Grok 4 Fast: 60.0 (#102)
| Benchmark | Gemini 1.5 Flash (May 2024) | Grok 4 Fast |
|---|---|---|
| LMArena Text | 1287 | 1407 |
| LMArena Creative Writing | 1285 | 1387 |
| LMArena Multi-Turn | 1253 | 1414 |
| WildBench | 79.2% | — |
Frequently asked questions
Is Gemini 1.5 Flash (May 2024) better than Grok 4 Fast?
Grok 4 Fast is the stronger model overall, scoring 39.4 to 33.2 on the Noometry Index.
Is Gemini 1.5 Flash (May 2024) or Grok 4 Fast better for coding?
Gemini 1.5 Flash (May 2024) scores higher on coding benchmarks: 34.4 versus 32.5 in the Noometry coding category.
How many benchmarks do Gemini 1.5 Flash (May 2024) and Grok 4 Fast share?
21 benchmarks have published results for both models. Gemini 1.5 Flash (May 2024) has 42 scored results on Noometry and Grok 4 Fast has 30.