Model comparison

Gemini 2.5 Flash-Lite vs Solar Pro4

Solar Pro4 is the stronger model overall, scoring 42.1 to 37.0 on the Noometry Index. Gemini 2.5 Flash-Lite costs 3.0× less per token, which makes it the better buy when Solar Pro4's lead doesn't matter for your workload.

Last verified October 12, 2026. 17 shared benchmarks.

Gemini 2.5 Flash-Lite

Google

37.0

Rank #211 Confirmed

Solar Pro4

Upstage

42.1

Rank #121 Confirmed

Summary

They share 17 benchmarks with published results for both. Gemini 2.5 Flash-Lite scores higher in 2 categories and Solar Pro4 in 6 categories; 5 gaps are clear of the uncertainty.
The widest gap is in long context, where Solar Pro4 leads 42.1 to 33.3.
Gemini 2.5 Flash-Lite is cheaper at $0.10 / $0.40 per million input/output tokens, against $0.30 / $1.20 for Solar Pro4.
Gemini 2.5 Flash-Lite accepts more context: 1.05M tokens versus 524K.

Side by side

Gemini 2.5 Flash-Lite and Solar Pro4 specifications
	Gemini 2.5 Flash-Lite	Solar Pro4
Provider	Google	Upstage
Noometry Index	37.0	42.1
Released	2025-06-17	2026-08-06
Weights	Proprietary	Proprietary
Context window	1.05M	524K
Max output	66K	131K
Input $ / M tokens	$0.10	$0.30
Output $ / M tokens	$0.40	$1.20
Results tracked	33	18

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Category by category

Coding Solar Pro4 leads

Gemini 2.5 Flash-Lite: 38.5 (#173), Solar Pro4: 40.1 (#149)

Coding benchmarks
Benchmark	Gemini 2.5 Flash-Lite	Solar Pro4
LMArena Coding	1373	1437
LMArena WebDev	—	1371
WeirdML	35.2%	—
ALE-Bench	325.9	—

Agentic & Tool Use Not comparable

Gemini 2.5 Flash-Lite: 28.0 (#96), Solar Pro4: —

Agentic & Tool Use benchmarks
Benchmark	Gemini 2.5 Flash-Lite	Solar Pro4
Berkeley Function Calling Leaderboard	36.9%	—

Reasoning Solar Pro4 leads

Gemini 2.5 Flash-Lite: 22.2 (#205), Solar Pro4: 28.5 (#104)

Reasoning benchmarks
Benchmark	Gemini 2.5 Flash-Lite	Solar Pro4
LMArena Hard Prompts	1377	1399
Kagi LLM Benchmark	40.5%	—
DTBench	62.8%	—
LMCA	18.1%	—
Epoch Capabilities Index	133.94	—

Math Too close to call

Gemini 2.5 Flash-Lite: 38.0 (#144), Solar Pro4: 38.8 (#128)

Math benchmarks
Benchmark	Gemini 2.5 Flash-Lite	Solar Pro4
LMArena Math	1373	1416
Omni-MATH	48%	—

Knowledge Solar Pro4 leads

Gemini 2.5 Flash-Lite: 32.5 (#210), Solar Pro4: 39.8 (#129)

Knowledge benchmarks
Benchmark	Gemini 2.5 Flash-Lite	Solar Pro4
LMArena Expert	1373	1427
MMLU-Pro	53.7%	—
Vectara Hallucination Rate	3.3%	—
GPQA (HELM)	30.9%	—

Multimodal Not comparable

Gemini 2.5 Flash-Lite: 29.1 (#114), Solar Pro4: —

Multimodal benchmarks
Benchmark	Gemini 2.5 Flash-Lite	Solar Pro4
LMArena Vision	1198	—
VPCT	30%	—

Multilingual Too close to call

Gemini 2.5 Flash-Lite: 49.3 (#134), Solar Pro4: 48.7 (#139)

Multilingual benchmarks
Benchmark	Gemini 2.5 Flash-Lite	Solar Pro4
LMArena Non-English	1369	1361
LMArena Chinese	1404	1415
LMArena French	1388	1397
LMArena German	1389	1364
LMArena Japanese	1359	1309
LMArena Korean	1360	1382
LMArena Russian	1373	1360
LMArena Spanish	1396	1401

Instruction Following Solar Pro4 leads

Gemini 2.5 Flash-Lite: 70.0 (#168), Solar Pro4: 72.7 (#132)

Instruction Following benchmarks
Benchmark	Gemini 2.5 Flash-Lite	Solar Pro4
LMArena Instruction Following	1367	1377
IFEval	81%	—

Long Context Solar Pro4 leads

Gemini 2.5 Flash-Lite: 33.3 (#262), Solar Pro4: 42.1 (#130)

Long Context benchmarks
Benchmark	Gemini 2.5 Flash-Lite	Solar Pro4
LMArena Longer Query	1373	1381
Fiction.LiveBench	47.2%	—

Writing & Preference Too close to call

Gemini 2.5 Flash-Lite: 56.8 (#135), Solar Pro4: 56.5 (#138)

Writing & Preference benchmarks
Benchmark	Gemini 2.5 Flash-Lite	Solar Pro4
LMArena Text	1379	1386
LMArena Creative Writing	1367	1316
LMArena Multi-Turn	1366	1385
WildBench	81.8%	—

Frequently asked questions

Is Gemini 2.5 Flash-Lite better than Solar Pro4?

Which is cheaper, Gemini 2.5 Flash-Lite or Solar Pro4?

Gemini 2.5 Flash-Lite is cheaper. It lists at $0.10 per million input tokens and $0.40 per million output tokens; Solar Pro4 lists at $0.30 and $1.20.

Is Gemini 2.5 Flash-Lite or Solar Pro4 better for coding?

Solar Pro4 scores higher on coding benchmarks: 40.1 versus 38.5 in the Noometry coding category.

Which has the bigger context window?

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

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

17 benchmarks have published results for both models. Gemini 2.5 Flash-Lite has 33 scored results on Noometry and Solar Pro4 has 18.