# Gemini 2.5 Flash vs Solar Pro4

> Solar Pro4 is the stronger model overall, scoring 42.1 to 39.3 on the Noometry Index.

- Canonical page: https://noometry.com/compare/gemini-2-5-flash-vs-solar-pro4
- Last updated: 2026-10-11
- Shared benchmarks: 17

## Summary

- They share 17 benchmarks with published results for both. Gemini 2.5 Flash scores higher in 4 categories and Solar Pro4 in 4 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where Solar Pro4 leads 28.5 to 18.1.
- Solar Pro4 is cheaper at $0.30 / $1.20 per million input/output tokens, against $0.30 / $2.50 for Gemini 2.5 Flash.
- Gemini 2.5 Flash accepts more context: 1.05M tokens versus 524K.

## Snapshot

| | Gemini 2.5 Flash | Solar Pro4 |
|---|---|---|
| Provider | Google | Upstage |
| Noometry Index | 39.3 | 42.1 |
| Rank | 170 | 121 |
| Context | 1.05M | 524K |
| Input $/M | $0.30 | $0.30 |
| Output $/M | $2.50 | $1.20 |
| Weights | Proprietary | Proprietary |

## Coding

- Gemini 2.5 Flash: 35.8 (#220)
- Solar Pro4: 40.1 (#149)

| Benchmark | Gemini 2.5 Flash | Solar Pro4 |
|---|---|---|
| LMArena Coding | 1424 | 1437 |
| SWE-bench Verified (bash only) | 28.7% | — |
| Aider Polyglot | 55.1% | — |
| LMArena WebDev | — | 1371 |
| WeirdML | 41.9% | — |
| ALE-Bench | 661.88 | — |

## Agentic & Tool Use

- Gemini 2.5 Flash: 30.8 (#74)
- Solar Pro4: —

| Benchmark | Gemini 2.5 Flash | Solar Pro4 |
|---|---|---|
| Terminal-Bench | 17.1% | — |
| Berkeley Function Calling Leaderboard | 56.2% | — |
| TheAgentCompany | 41.1% | — |
| BALROG | 33.5% | — |
| Vending-Bench 2 | 548.84 | — |

## Reasoning

- Gemini 2.5 Flash: 18.1 (#286)
- Solar Pro4: 28.5 (#104)

| Benchmark | Gemini 2.5 Flash | Solar Pro4 |
|---|---|---|
| LMArena Hard Prompts | 1422 | 1399 |
| ARC-AGI-2 | 2.5% | — |
| SimpleBench | 41.2% | — |
| Kagi LLM Benchmark | 56.8% | — |
| ARC-AGI-1 | 33.3% | — |
| CritPt | 1.1% | — |
| EnigmaEval | 2.7% | — |
| DTBench | 76.5% | — |
| LMCA | 27.5% | — |
| Epoch Capabilities Index | 143.03 | — |
| ForecastBench | 60.6 | — |

## Math

- Gemini 2.5 Flash: 39.9 (#98)
- Solar Pro4: 38.8 (#128)

| Benchmark | Gemini 2.5 Flash | Solar Pro4 |
|---|---|---|
| LMArena Math | 1415 | 1416 |
| OTIS Mock AIME 2024-2025 | 73.1% | — |
| Omni-MATH | 38.5% | — |
| FrontierMath (Feb 2025 set) | 4.8% | — |
| FrontierMath Tier 4 (v1) | 4.2% | — |

## Knowledge

- Gemini 2.5 Flash: 36.4 (#168)
- Solar Pro4: 39.8 (#129)

| Benchmark | Gemini 2.5 Flash | Solar Pro4 |
|---|---|---|
| LMArena Expert | 1426 | 1427 |
| Humanity's Last Exam | 12.1% | — |
| MMLU-Pro | 63.9% | — |
| Confabulations | 16.8% | — |
| Vectara Hallucination Rate | 7.8% | — |
| GPQA (HELM) | 39% | — |

## Multimodal

- Gemini 2.5 Flash: 41.8 (#32)
- Solar Pro4: —

| Benchmark | Gemini 2.5 Flash | Solar Pro4 |
|---|---|---|
| LMArena Vision | 1253 | — |
| GeoBench | 76% | — |
| VPCT | 46.2% | — |
| SpatialViz-Bench | 36.9% | — |

## Multilingual

- Gemini 2.5 Flash: 52.3 (#88)
- Solar Pro4: 48.7 (#139)

| Benchmark | Gemini 2.5 Flash | Solar Pro4 |
|---|---|---|
| LMArena Non-English | 1409 | 1361 |
| LMArena Chinese | 1450 | 1415 |
| LMArena French | 1433 | 1397 |
| LMArena German | 1418 | 1364 |
| LMArena Japanese | 1405 | 1309 |
| LMArena Korean | 1385 | 1382 |
| LMArena Russian | 1415 | 1360 |
| LMArena Spanish | 1421 | 1401 |

## Instruction Following

- Gemini 2.5 Flash: 75.7 (#54)
- Solar Pro4: 72.7 (#132)

| Benchmark | Gemini 2.5 Flash | Solar Pro4 |
|---|---|---|
| LMArena Instruction Following | 1405 | 1377 |
| IFEval | 89.8% | — |

## Long Context

- Gemini 2.5 Flash: 47.5 (#17)
- Solar Pro4: 42.1 (#130)

| Benchmark | Gemini 2.5 Flash | Solar Pro4 |
|---|---|---|
| LMArena Longer Query | 1419 | 1381 |
| Fiction.LiveBench | 77.8% | — |

## Writing & Preference

- Gemini 2.5 Flash: 53.8 (#157)
- Solar Pro4: 56.5 (#138)

| Benchmark | Gemini 2.5 Flash | Solar Pro4 |
|---|---|---|
| LMArena Text | 1417 | 1386 |
| LMArena Creative Writing | 1400 | 1316 |
| LMArena Multi-Turn | 1408 | 1385 |
| Short-Story Creative Writing | 76.5% | — |
| EQ-Bench Creative Writing | 1137 | — |
| WildBench | 81.7% | — |

## FAQ

### Is Gemini 2.5 Flash better than Solar Pro4?

Solar Pro4 is the stronger model overall, scoring 42.1 to 39.3 on the Noometry Index.

### Which is cheaper, Gemini 2.5 Flash or Solar Pro4?

Solar Pro4 is cheaper. It lists at $0.30 per million input tokens and $1.20 per million output tokens; Gemini 2.5 Flash lists at $0.30 and $2.50.

### Is Gemini 2.5 Flash or Solar Pro4 better for coding?

Solar Pro4 scores higher on coding benchmarks: 40.1 versus 35.8 in the Noometry coding category.

### Which has the bigger context window?

Gemini 2.5 Flash does, with 1.05M tokens against 524K.

### How many benchmarks do Gemini 2.5 Flash and Solar Pro4 share?

17 benchmarks have published results for both models. Gemini 2.5 Flash has 54 scored results on Noometry and Solar Pro4 has 18.