Model comparison
Gemini 2.5 Deep Think vs Gemini 3.5 Flash
Gemini 3.5 Flash has enough public results to be ranked (#32); Gemini 2.5 Deep Think does not yet, so treat this comparison as directional.
Last verified . 2 shared benchmarks.
GoogleSummary
- They share 2 benchmarks with published results for both.
Side by side
| Gemini 2.5 Deep Think | Gemini 3.5 Flash | |
|---|---|---|
| Provider | ||
| Noometry Index | — | 54.2 |
| Released | 2025-08-01 | 2026-05-19 |
| Weights | Proprietary | Proprietary |
| Context window | — | 1.05M |
| Max output | — | 66K |
| Input $ / M tokens | — | $1.50 |
| Output $ / M tokens | — | $9 |
| Results tracked | 2 | 54 |
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Category by category
Coding Not comparable
Gemini 2.5 Deep Think: —, Gemini 3.5 Flash: 49.4 (#49)
| Benchmark | Gemini 2.5 Deep Think | Gemini 3.5 Flash |
|---|---|---|
| SWE-bench Verified | — | 79.3% |
| DeepSWE | — | 37.4% |
| LMArena WebDev | — | 1499 |
| SciCode | — | 53.1% |
| WeirdML | — | 62.6% |
| LMArena Coding | — | 1492 |
| ALE-Bench | — | 911.02 |
Agentic & Tool Use Not comparable
Gemini 2.5 Deep Think: —, Gemini 3.5 Flash: 24.7 (#114)
| Benchmark | Gemini 2.5 Deep Think | Gemini 3.5 Flash |
|---|---|---|
| APEX-Agents | — | 27.5% |
| GBAEval | — | 6.7% |
| GDP.pdf | — | 14% |
| Vending-Bench 2 | — | 5,396 |
Reasoning Not comparable
Gemini 2.5 Deep Think: —, Gemini 3.5 Flash: 62.8 (#18)
| Benchmark | Gemini 2.5 Deep Think | Gemini 3.5 Flash |
|---|---|---|
| ARC-AGI-2 | — | 72.1% |
| SimpleBench | — | 76.7% |
| NYT Connections (extended) | — | 92.6% |
| ARC-AGI-1 | — | 92.5% |
| CritPt | — | 13.1% |
| Chess Puzzles | — | 50% |
| EnigmaEval | — | 25.4% |
| EBR-Bench | — | 4.8% |
| LMArena Hard Prompts | — | 1488 |
| Mystery Game Puzzles | — | 32% |
| DTBench | — | 94.7% |
| LMCA | — | 47.1% |
| Surface Evolver Bench | — | 58.1% |
| Epoch Capabilities Index | — | 154.46 |
| ForecastBench | — | 59 |
Math Not comparable
Gemini 2.5 Deep Think: —, Gemini 3.5 Flash: 60.7 (#36)
| Benchmark | Gemini 2.5 Deep Think | Gemini 3.5 Flash |
|---|---|---|
| FrontierMath (Feb 2025 set) | 29% | 39% |
| FrontierMath Tier 4 (v1) | 10.4% | 14.6% |
| 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% |
| LMArena Math | — | 1504 |
Knowledge Not comparable
Gemini 2.5 Deep Think: —, Gemini 3.5 Flash: 66.3 (#11)
| Benchmark | Gemini 2.5 Deep Think | Gemini 3.5 Flash |
|---|---|---|
| GPQA Diamond | — | 92.8% |
| SimpleQA Verified | — | 66.2% |
| LMArena Expert | — | 1495 |
Multimodal Not comparable
Gemini 2.5 Deep Think: —, Gemini 3.5 Flash: 45.7 (#15)
| Benchmark | Gemini 2.5 Deep Think | Gemini 3.5 Flash |
|---|---|---|
| LMArena Vision | — | 1310 |
| Blueprint-Bench 2 | — | 33.6% |
| LMArena Document | — | 1463 |
Multilingual Not comparable
Gemini 2.5 Deep Think: —, Gemini 3.5 Flash: 57.0 (#13)
| Benchmark | Gemini 2.5 Deep Think | Gemini 3.5 Flash |
|---|---|---|
| LMArena Non-English | — | 1476 |
| LMArena Chinese | — | 1526 |
| LMArena French | — | 1490 |
| LMArena German | — | 1492 |
| LMArena Japanese | — | 1486 |
| LMArena Korean | — | 1451 |
| LMArena Russian | — | 1493 |
| LMArena Spanish | — | 1480 |
Instruction Following Not comparable
Gemini 2.5 Deep Think: —, Gemini 3.5 Flash: 77.0 (#30)
| Benchmark | Gemini 2.5 Deep Think | Gemini 3.5 Flash |
|---|---|---|
| LMArena Instruction Following | — | 1467 |
Long Context Not comparable
Gemini 2.5 Deep Think: —, Gemini 3.5 Flash: 45.4 (#38)
| Benchmark | Gemini 2.5 Deep Think | Gemini 3.5 Flash |
|---|---|---|
| LMArena Longer Query | — | 1482 |
Writing & Preference Not comparable
Gemini 2.5 Deep Think: —, Gemini 3.5 Flash: 65.5 (#47)
| Benchmark | Gemini 2.5 Deep Think | Gemini 3.5 Flash |
|---|---|---|
| LMArena Text | — | 1482 |
| LMArena Creative Writing | — | 1470 |
| EQ-Bench 4 | — | 1087 |
| LMArena Multi-Turn | — | 1481 |
Frequently asked questions
Is Gemini 2.5 Deep Think better than Gemini 3.5 Flash?
Gemini 3.5 Flash has enough public results to be ranked (#32); Gemini 2.5 Deep Think does not yet, so treat this comparison as directional.
How many benchmarks do Gemini 2.5 Deep Think and Gemini 3.5 Flash share?
2 benchmarks have published results for both models. Gemini 2.5 Deep Think has 2 scored results on Noometry and Gemini 3.5 Flash has 54.