Model comparison
Gemini 3.5 Flash vs Solar Pro 3
Gemini 3.5 Flash has enough public results to be ranked (#29); Solar Pro 3 does not yet, so treat this comparison as directional.
Last verified . 2 shared benchmarks.
Google
UpstageSummary
- They share 2 benchmarks with published results for both. Gemini 3.5 Flash scores higher in 2 categories and Solar Pro 3 in 0 categories; 2 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where Gemini 3.5 Flash leads 62.7 to 21.7.
- The biggest single-benchmark swing is SciCode: 53.1% for Gemini 3.5 Flash and 24.7% for Solar Pro 3.
- Solar Pro 3 is cheaper at $0.25 / $0.25 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 131K.
Side by side
| Gemini 3.5 Flash | Solar Pro 3 | |
|---|---|---|
| Provider | Upstage | |
| Noometry Index | 54.1 | 33.3 |
| Released | 2026-05-19 | 2026-01 |
| Weights | Proprietary | Proprietary |
| Context window | 1.05M | 131K |
| Max output | 66K | 8K |
| Input $ / M tokens | $1.50 | $0.25 |
| Output $ / M tokens | $9 | $0.25 |
| Results tracked | 54 | 2 |
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Category by category
Coding Gemini 3.5 Flash leads
Gemini 3.5 Flash: 49.1 (#46), Solar Pro 3: 34.2
| Benchmark | Gemini 3.5 Flash | Solar Pro 3 |
|---|---|---|
| SciCode | 53.1% | 24.7% |
| SWE-bench Verified | 79.3% | — |
| DeepSWE | 37.4% | — |
| LMArena WebDev | 1499 | — |
| WeirdML | 62.6% | — |
| LMArena Coding | 1492 | — |
| ALE-Bench | 911.02 | — |
Agentic & Tool Use Not comparable
Gemini 3.5 Flash: 24.8 (#107), Solar Pro 3: —
| Benchmark | Gemini 3.5 Flash | Solar Pro 3 |
|---|---|---|
| APEX-Agents | 27.5% | — |
| GBAEval | 6.7% | — |
| GDP.pdf | 14% | — |
| Vending-Bench 2 | 5,396 | — |
Reasoning Gemini 3.5 Flash leads
Gemini 3.5 Flash: 62.7 (#16), Solar Pro 3: 21.7
| Benchmark | Gemini 3.5 Flash | Solar Pro 3 |
|---|---|---|
| CritPt | 13.1% | 0% |
| ARC-AGI-2 | 72.1% | — |
| SimpleBench | 76.7% | — |
| NYT Connections (extended) | 92.6% | — |
| ARC-AGI-1 | 92.5% | — |
| 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 | 154.55 | — |
| ForecastBench | 59 | — |
Math Not comparable
Gemini 3.5 Flash: 60.5 (#30), Solar Pro 3: —
| Benchmark | Gemini 3.5 Flash | Solar Pro 3 |
|---|---|---|
| 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 | 1502 | — |
| FrontierMath (Feb 2025 set) | 39% | — |
| FrontierMath Tier 4 (v1) | 14.6% | — |
Knowledge Not comparable
Gemini 3.5 Flash: 66.3 (#10), Solar Pro 3: —
| Benchmark | Gemini 3.5 Flash | Solar Pro 3 |
|---|---|---|
| GPQA Diamond | 92.8% | — |
| SimpleQA Verified | 66.2% | — |
| LMArena Expert | 1493 | — |
Multimodal Not comparable
Gemini 3.5 Flash: 45.7 (#13), Solar Pro 3: —
| Benchmark | Gemini 3.5 Flash | Solar Pro 3 |
|---|---|---|
| LMArena Vision | 1311 | — |
| Blueprint-Bench 2 | 33.6% | — |
| LMArena Document | 1463 | — |
Multilingual Not comparable
Gemini 3.5 Flash: 57.1 (#12), Solar Pro 3: —
| Benchmark | Gemini 3.5 Flash | Solar Pro 3 |
|---|---|---|
| LMArena Non-English | 1475 | — |
| LMArena Chinese | 1525 | — |
| LMArena French | 1490 | — |
| LMArena German | 1500 | — |
| LMArena Japanese | 1481 | — |
| LMArena Korean | 1453 | — |
| LMArena Russian | 1491 | — |
| LMArena Spanish | 1478 | — |
Instruction Following Not comparable
Gemini 3.5 Flash: 77.2 (#29), Solar Pro 3: —
| Benchmark | Gemini 3.5 Flash | Solar Pro 3 |
|---|---|---|
| LMArena Instruction Following | 1466 | — |
Long Context Not comparable
Gemini 3.5 Flash: 45.3 (#39), Solar Pro 3: —
| Benchmark | Gemini 3.5 Flash | Solar Pro 3 |
|---|---|---|
| LMArena Longer Query | 1481 | — |
Writing & Preference Not comparable
Gemini 3.5 Flash: 65.5 (#46), Solar Pro 3: —
| Benchmark | Gemini 3.5 Flash | Solar Pro 3 |
|---|---|---|
| LMArena Text | 1481 | — |
| LMArena Creative Writing | 1467 | — |
| EQ-Bench 4 | 1087 | — |
| LMArena Multi-Turn | 1482 | — |
Frequently asked questions
Is Gemini 3.5 Flash better than Solar Pro 3?
Gemini 3.5 Flash has enough public results to be ranked (#29); Solar Pro 3 does not yet, so treat this comparison as directional.
Which is cheaper, Gemini 3.5 Flash or Solar Pro 3?
Solar Pro 3 is cheaper. It lists at $0.25 per million input tokens and $0.25 per million output tokens; Gemini 3.5 Flash lists at $1.50 and $9.
Is Gemini 3.5 Flash or Solar Pro 3 better for coding?
Gemini 3.5 Flash scores higher on coding benchmarks: 49.1 versus 34.2 in the Noometry coding category.
Which has the bigger context window?
Gemini 3.5 Flash does, with 1.05M tokens against 131K.
How many benchmarks do Gemini 3.5 Flash and Solar Pro 3 share?
2 benchmarks have published results for both models. Gemini 3.5 Flash has 54 scored results on Noometry and Solar Pro 3 has 2.