Model comparison
Gemini 3.5 Flash vs Gemini 3 Flash Preview
Gemini 3.5 Flash is the stronger model overall, scoring 54.2 to 52.3 on the Noometry Index. Gemini 3 Flash Preview costs 3.0× less per token, which makes it the better buy when Gemini 3.5 Flash's lead doesn't matter for your workload.
Last verified . 45 shared benchmarks.
GoogleSummary
- They share 45 benchmarks with published results for both. Gemini 3.5 Flash scores higher in 7 categories and Gemini 3 Flash Preview in 3 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in agentic & tool use, where Gemini 3 Flash Preview leads 38.7 to 24.7.
- The biggest single-benchmark swing is ARC-AGI-2: 72.1% for Gemini 3.5 Flash and 33.6% for Gemini 3 Flash Preview.
- Gemini 3 Flash Preview is cheaper at $0.50 / $3 per million input/output tokens, against $1.50 / $9 for Gemini 3.5 Flash.
Side by side
| Gemini 3.5 Flash | Gemini 3 Flash Preview | |
|---|---|---|
| Provider | ||
| Noometry Index | 54.2 | 52.3 |
| Released | 2026-05-19 | 2025-12-17 |
| Weights | Proprietary | Proprietary |
| Context window | 1.05M | 1.05M |
| Max output | 66K | 66K |
| Input $ / M tokens | $1.50 | $0.50 |
| Output $ / M tokens | $9 | $3 |
| Results tracked | 54 | 59 |
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Category by category
Coding Gemini 3 Flash Preview leads
Gemini 3.5 Flash: 49.4 (#49), Gemini 3 Flash Preview: 50.9 (#42)
| Benchmark | Gemini 3.5 Flash | Gemini 3 Flash Preview |
|---|---|---|
| SWE-bench Verified | 79.3% | 75.4% |
| LMArena WebDev | 1499 | 1439 |
| WeirdML | 62.6% | 61.6% |
| LMArena Coding | 1492 | 1460 |
| ALE-Bench | 911.02 | 1,367 |
| DeepSWE | 37.4% | — |
| SWE-bench Verified (bash only) | — | 75.8% |
| SWE-bench Multilingual | — | 72.7% |
| SciCode | 53.1% | — |
| GSO | — | 9.8% |
Agentic & Tool Use Gemini 3 Flash Preview leads
Gemini 3.5 Flash: 24.7 (#114), Gemini 3 Flash Preview: 38.7 (#29)
| Benchmark | Gemini 3.5 Flash | Gemini 3 Flash Preview |
|---|---|---|
| GDP.pdf | 14% | 10% |
| Vending-Bench 2 | 5,396 | 3,635 |
| Terminal-Bench | — | 64.3% |
| APEX-Agents | 27.5% | — |
| τ²-bench Airline | — | 82.5% |
| τ²-bench Banking | — | 27.3% |
| τ²-bench Retail | — | 76.8% |
| τ²-bench Telecom | — | 91.2% |
| DeepResearch Bench | — | 49.8% |
| BALROG | — | 48.1% |
| GBAEval | 6.7% | — |
| LMArena Search | — | 1198 |
Reasoning Gemini 3.5 Flash leads
Gemini 3.5 Flash: 62.8 (#18), Gemini 3 Flash Preview: 49.2 (#37)
| Benchmark | Gemini 3.5 Flash | Gemini 3 Flash Preview |
|---|---|---|
| ARC-AGI-2 | 72.1% | 33.6% |
| SimpleBench | 76.7% | 61.1% |
| NYT Connections (extended) | 92.6% | 83.1% |
| ARC-AGI-1 | 92.5% | 84.7% |
| Chess Puzzles | 50% | 40% |
| LMArena Hard Prompts | 1488 | 1465 |
| Mystery Game Puzzles | 32% | 26% |
| DTBench | 94.7% | 89.1% |
| LMCA | 47.1% | 43.1% |
| Epoch Capabilities Index | 154.46 | 151.8 |
| ForecastBench | 59 | 58.5 |
| CritPt | 13.1% | — |
| EnigmaEval | 25.4% | — |
| EBR-Bench | 4.8% | — |
| Surface Evolver Bench | 58.1% | — |
Math Gemini 3.5 Flash leads
Gemini 3.5 Flash: 60.7 (#36), Gemini 3 Flash Preview: 51.7 (#55)
| Benchmark | Gemini 3.5 Flash | Gemini 3 Flash Preview |
|---|---|---|
| FrontierMath (Tiers 1-3) | 62.8% | 51.2% |
| FrontierMath Tier 4 | 26.8% | 17.1% |
| MathArena Final-Answer Competitions | 76.3% | 67.6% |
| OTIS Mock AIME 2024-2025 | 95.6% | 95.6% |
| ProofBench | 31% | 15% |
| LMArena Math | 1504 | 1473 |
| FrontierMath (Feb 2025 set) | 39% | 35.6% |
| FrontierMath Tier 4 (v1) | 14.6% | 4.2% |
Knowledge Gemini 3.5 Flash leads
Gemini 3.5 Flash: 66.3 (#11), Gemini 3 Flash Preview: 58.8 (#33)
| Benchmark | Gemini 3.5 Flash | Gemini 3 Flash Preview |
|---|---|---|
| GPQA Diamond | 92.8% | 89.4% |
| SimpleQA Verified | 66.2% | 66.8% |
| LMArena Expert | 1495 | 1462 |
| Vectara Hallucination Rate | — | 13.5% |
Multimodal Too close to call
Gemini 3.5 Flash: 45.7 (#15), Gemini 3 Flash Preview: 45.5 (#16)
| Benchmark | Gemini 3.5 Flash | Gemini 3 Flash Preview |
|---|---|---|
| LMArena Vision | 1310 | 1285 |
| Blueprint-Bench 2 | 33.6% | 0% |
| LMArena Document | 1463 | 1413 |
| GeoBench | — | 88% |
| VPCT | — | 72.6% |
Multilingual Gemini 3.5 Flash leads
Gemini 3.5 Flash: 57.0 (#13), Gemini 3 Flash Preview: 55.7 (#27)
| Benchmark | Gemini 3.5 Flash | Gemini 3 Flash Preview |
|---|---|---|
| LMArena Non-English | 1476 | 1458 |
| LMArena Chinese | 1526 | 1511 |
| LMArena French | 1490 | 1477 |
| LMArena German | 1492 | 1497 |
| LMArena Japanese | 1486 | 1489 |
| LMArena Korean | 1451 | 1443 |
| LMArena Russian | 1493 | 1480 |
| LMArena Spanish | 1480 | 1469 |
Instruction Following Gemini 3.5 Flash leads
Gemini 3.5 Flash: 77.0 (#30), Gemini 3 Flash Preview: 75.7 (#56)
| Benchmark | Gemini 3.5 Flash | Gemini 3 Flash Preview |
|---|---|---|
| LMArena Instruction Following | 1467 | 1437 |
Long Context Gemini 3.5 Flash leads
Gemini 3.5 Flash: 45.4 (#38), Gemini 3 Flash Preview: 44.4 (#67)
| Benchmark | Gemini 3.5 Flash | Gemini 3 Flash Preview |
|---|---|---|
| LMArena Longer Query | 1482 | 1452 |
Writing & Preference Too close to call
Gemini 3.5 Flash: 65.5 (#47), Gemini 3 Flash Preview: 65.5 (#45)
| Benchmark | Gemini 3.5 Flash | Gemini 3 Flash Preview |
|---|---|---|
| LMArena Text | 1482 | 1466 |
| LMArena Creative Writing | 1470 | 1457 |
| LMArena Multi-Turn | 1481 | 1471 |
| EQ-Bench 4 | 1087 | — |
Frequently asked questions
Is Gemini 3.5 Flash better than Gemini 3 Flash Preview?
Gemini 3.5 Flash is the stronger model overall, scoring 54.2 to 52.3 on the Noometry Index. Gemini 3 Flash Preview costs 3.0× 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 Gemini 3 Flash Preview?
Gemini 3 Flash Preview is cheaper. It lists at $0.50 per million input tokens and $3 per million output tokens; Gemini 3.5 Flash lists at $1.50 and $9.
Is Gemini 3.5 Flash or Gemini 3 Flash Preview better for coding?
Gemini 3 Flash Preview scores higher on coding benchmarks: 50.9 versus 49.4 in the Noometry coding category.
Which has the bigger context window?
Both accept 1.05M tokens.
How many benchmarks do Gemini 3.5 Flash and Gemini 3 Flash Preview share?
45 benchmarks have published results for both models. Gemini 3.5 Flash has 54 scored results on Noometry and Gemini 3 Flash Preview has 59.