Noometry

Model comparison

Gemini 2.5 Flash vs Solar Pro4

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

Last verified . 17 shared benchmarks.

Gemini 2.5 Flash Google

39.3

Rank #170 Confirmed

Solar Pro4 Upstage

42.1

Rank #121 Confirmed

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.

Side by side

Gemini 2.5 FlashSolar Pro4
ProviderGoogleUpstage
Noometry Index39.342.1
Released2025-04-172026-08-06
WeightsProprietaryProprietary
Context window1.05M524K
Max output66K131K
Input $ / M tokens$0.30$0.30
Output $ / M tokens$2.50$1.20
Results tracked5418

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Category by category

Coding Solar Pro4 leads

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

BenchmarkGemini 2.5 FlashSolar Pro4
LMArena Coding14241437
SWE-bench Verified (bash only)28.7%—
Aider Polyglot55.1%—
LMArena WebDev—1371
WeirdML41.9%—
ALE-Bench661.88—

Agentic & Tool Use Not comparable

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

BenchmarkGemini 2.5 FlashSolar Pro4
Terminal-Bench17.1%—
Berkeley Function Calling Leaderboard56.2%—
TheAgentCompany41.1%—
BALROG33.5%—
Vending-Bench 2548.84—

Reasoning Solar Pro4 leads

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

BenchmarkGemini 2.5 FlashSolar Pro4
LMArena Hard Prompts14221399
ARC-AGI-22.5%—
SimpleBench41.2%—
Kagi LLM Benchmark56.8%—
ARC-AGI-133.3%—
CritPt1.1%—
EnigmaEval2.7%—
DTBench76.5%—
LMCA27.5%—
Epoch Capabilities Index143.03—
ForecastBench60.6—

Math Gemini 2.5 Flash leads

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

BenchmarkGemini 2.5 FlashSolar Pro4
LMArena Math14151416
OTIS Mock AIME 2024-202573.1%—
Omni-MATH38.5%—
FrontierMath (Feb 2025 set)4.8%—
FrontierMath Tier 4 (v1)4.2%—

Knowledge Solar Pro4 leads

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

BenchmarkGemini 2.5 FlashSolar Pro4
LMArena Expert14261427
Humanity's Last Exam12.1%—
MMLU-Pro63.9%—
Confabulations16.8%—
Vectara Hallucination Rate7.8%—
GPQA (HELM)39%—

Multimodal Not comparable

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

BenchmarkGemini 2.5 FlashSolar Pro4
LMArena Vision1253—
GeoBench76%—
VPCT46.2%—
SpatialViz-Bench36.9%—

Multilingual Gemini 2.5 Flash leads

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

BenchmarkGemini 2.5 FlashSolar Pro4
LMArena Non-English14091361
LMArena Chinese14501415
LMArena French14331397
LMArena German14181364
LMArena Japanese14051309
LMArena Korean13851382
LMArena Russian14151360
LMArena Spanish14211401

Instruction Following Gemini 2.5 Flash leads

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

BenchmarkGemini 2.5 FlashSolar Pro4
LMArena Instruction Following14051377
IFEval89.8%—

Long Context Gemini 2.5 Flash leads

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

BenchmarkGemini 2.5 FlashSolar Pro4
LMArena Longer Query14191381
Fiction.LiveBench77.8%—

Writing & Preference Solar Pro4 leads

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

BenchmarkGemini 2.5 FlashSolar Pro4
LMArena Text14171386
LMArena Creative Writing14001316
LMArena Multi-Turn14081385
Short-Story Creative Writing76.5%—
EQ-Bench Creative Writing1137—
WildBench81.7%—

Frequently asked questions

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.

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