Model comparison
Gemini 3.5 Flash vs Grok 4.20 Multi-Agent
Gemini 3.5 Flash is the stronger model overall, scoring 54.2 to 46.2 on the Noometry Index. Grok 4.20 Multi-Agent costs 2.2× less per token, which makes it the better buy when Gemini 3.5 Flash's lead doesn't matter for your workload.
Last verified . 19 shared benchmarks.
GoogleSummary
- They share 19 benchmarks with published results for both. Gemini 3.5 Flash scores higher in 9 categories and Grok 4.20 Multi-Agent in 0 categories; 9 gaps are clear of the uncertainty.
- The widest gap is in knowledge, where Gemini 3.5 Flash leads 66.3 to 40.4.
- Grok 4.20 Multi-Agent is cheaper at $1.25 / $2.50 per million input/output tokens, against $1.50 / $9 for Gemini 3.5 Flash.
- Gemini 3.5 Flash accepts more context: 1.05M tokens versus 1M.
Side by side
| Gemini 3.5 Flash | Grok 4.20 Multi-Agent | |
|---|---|---|
| Provider | xAI | |
| Noometry Index | 54.2 | 46.2 |
| Released | 2026-05-19 | 2026-03-09 |
| Weights | Proprietary | Proprietary |
| Context window | 1.05M | 1M |
| Max output | 66K | 30K |
| Input $ / M tokens | $1.50 | $1.25 |
| Output $ / M tokens | $9 | $2.50 |
| Results tracked | 54 | 20 |
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Category by category
Coding Gemini 3.5 Flash leads
Gemini 3.5 Flash: 49.4 (#49), Grok 4.20 Multi-Agent: 43.0 (#92)
| Benchmark | Gemini 3.5 Flash | Grok 4.20 Multi-Agent |
|---|---|---|
| LMArena Coding | 1492 | 1457 |
| SWE-bench Verified | 79.3% | — |
| DeepSWE | 37.4% | — |
| LMArena WebDev | 1499 | — |
| SciCode | 53.1% | — |
| WeirdML | 62.6% | — |
| ALE-Bench | 911.02 | — |
Agentic & Tool Use Not comparable
Gemini 3.5 Flash: 24.7 (#114), Grok 4.20 Multi-Agent: —
| Benchmark | Gemini 3.5 Flash | Grok 4.20 Multi-Agent |
|---|---|---|
| APEX-Agents | 27.5% | — |
| GBAEval | 6.7% | — |
| GDP.pdf | 14% | — |
| LMArena Search | — | 1204 |
| Vending-Bench 2 | 5,396 | — |
Reasoning Gemini 3.5 Flash leads
Gemini 3.5 Flash: 62.8 (#18), Grok 4.20 Multi-Agent: 43.9 (#48)
| Benchmark | Gemini 3.5 Flash | Grok 4.20 Multi-Agent |
|---|---|---|
| NYT Connections (extended) | 92.6% | 89.6% |
| LMArena Hard Prompts | 1488 | 1448 |
| ARC-AGI-2 | 72.1% | — |
| SimpleBench | 76.7% | — |
| ARC-AGI-1 | 92.5% | — |
| CritPt | 13.1% | — |
| Chess Puzzles | 50% | — |
| EnigmaEval | 25.4% | — |
| EBR-Bench | 4.8% | — |
| Mystery Game Puzzles | 32% | — |
| DTBench | 94.7% | — |
| LMCA | 47.1% | — |
| Surface Evolver Bench | 58.1% | — |
| Epoch Capabilities Index | 154.46 | — |
| ForecastBench | 59 | — |
Math Gemini 3.5 Flash leads
Gemini 3.5 Flash: 60.7 (#36), Grok 4.20 Multi-Agent: 39.4 (#104)
| Benchmark | Gemini 3.5 Flash | Grok 4.20 Multi-Agent |
|---|---|---|
| LMArena Math | 1504 | 1442 |
| FrontierMath (Tiers 1-3) | 62.8% | — |
| FrontierMath Tier 4 | 26.8% | — |
| MathArena Final-Answer Competitions | 76.3% | — |
| OTIS Mock AIME 2024-2025 | 95.6% | — |
| ProofBench | 31% | — |
| FrontierMath (Feb 2025 set) | 39% | — |
| FrontierMath Tier 4 (v1) | 14.6% | — |
Knowledge Gemini 3.5 Flash leads
Gemini 3.5 Flash: 66.3 (#11), Grok 4.20 Multi-Agent: 40.4 (#119)
| Benchmark | Gemini 3.5 Flash | Grok 4.20 Multi-Agent |
|---|---|---|
| LMArena Expert | 1495 | 1445 |
| GPQA Diamond | 92.8% | — |
| SimpleQA Verified | 66.2% | — |
Multimodal Gemini 3.5 Flash leads
Gemini 3.5 Flash: 45.7 (#15), Grok 4.20 Multi-Agent: 40.5 (#48)
| Benchmark | Gemini 3.5 Flash | Grok 4.20 Multi-Agent |
|---|---|---|
| LMArena Vision | 1310 | 1259 |
| Blueprint-Bench 2 | 33.6% | — |
| LMArena Document | 1463 | — |
Multilingual Gemini 3.5 Flash leads
Gemini 3.5 Flash: 57.0 (#13), Grok 4.20 Multi-Agent: 54.4 (#43)
| Benchmark | Gemini 3.5 Flash | Grok 4.20 Multi-Agent |
|---|---|---|
| LMArena Non-English | 1476 | 1440 |
| LMArena Chinese | 1526 | 1475 |
| LMArena French | 1490 | 1466 |
| LMArena German | 1492 | 1456 |
| LMArena Japanese | 1486 | 1405 |
| LMArena Korean | 1451 | 1416 |
| LMArena Russian | 1493 | 1457 |
| LMArena Spanish | 1480 | 1447 |
Instruction Following Gemini 3.5 Flash leads
Gemini 3.5 Flash: 77.0 (#30), Grok 4.20 Multi-Agent: 74.8 (#84)
| Benchmark | Gemini 3.5 Flash | Grok 4.20 Multi-Agent |
|---|---|---|
| LMArena Instruction Following | 1467 | 1420 |
Long Context Gemini 3.5 Flash leads
Gemini 3.5 Flash: 45.4 (#38), Grok 4.20 Multi-Agent: 43.7 (#88)
| Benchmark | Gemini 3.5 Flash | Grok 4.20 Multi-Agent |
|---|---|---|
| LMArena Longer Query | 1482 | 1431 |
Writing & Preference Gemini 3.5 Flash leads
Gemini 3.5 Flash: 65.5 (#47), Grok 4.20 Multi-Agent: 64.0 (#59)
| Benchmark | Gemini 3.5 Flash | Grok 4.20 Multi-Agent |
|---|---|---|
| LMArena Text | 1482 | 1450 |
| LMArena Creative Writing | 1470 | 1436 |
| LMArena Multi-Turn | 1481 | 1452 |
| EQ-Bench 4 | 1087 | — |
Frequently asked questions
Is Gemini 3.5 Flash better than Grok 4.20 Multi-Agent?
Gemini 3.5 Flash is the stronger model overall, scoring 54.2 to 46.2 on the Noometry Index. Grok 4.20 Multi-Agent costs 2.2× less per token, which makes it the better buy when Gemini 3.5 Flash's lead doesn't matter for your workload.
Which is cheaper, Gemini 3.5 Flash or Grok 4.20 Multi-Agent?
Grok 4.20 Multi-Agent is cheaper. It lists at $1.25 per million input tokens and $2.50 per million output tokens; Gemini 3.5 Flash lists at $1.50 and $9.
Is Gemini 3.5 Flash or Grok 4.20 Multi-Agent better for coding?
Gemini 3.5 Flash scores higher on coding benchmarks: 49.4 versus 43.0 in the Noometry coding category.
Which has the bigger context window?
Gemini 3.5 Flash does, with 1.05M tokens against 1M.
How many benchmarks do Gemini 3.5 Flash and Grok 4.20 Multi-Agent share?
19 benchmarks have published results for both models. Gemini 3.5 Flash has 54 scored results on Noometry and Grok 4.20 Multi-Agent has 20.