Noometry

Model comparison

DeepSeek V4.1 Flash vs Solar Pro4

DeepSeek V4.1 Flash is the stronger model overall, scoring 50.3 to 41.5 on the Noometry Index.

Last verified . 15 shared benchmarks.

DeepSeek V4.1 Flash DeepSeek

50.3

Rank #40 Confirmed

Solar Pro4 Upstage

41.5

Rank #123 Confirmed

Summary

  • They share 15 benchmarks with published results for both. DeepSeek V4.1 Flash scores higher in 8 categories and Solar Pro4 in 0 categories; 8 gaps are clear of the uncertainty.
  • The widest gap is in reasoning, where DeepSeek V4.1 Flash leads 46.2 to 27.3.
  • DeepSeek V4.1 Flash is cheaper at $0.15 / $0.60 per million input/output tokens, against $0.30 / $1.20 for Solar Pro4.
  • DeepSeek V4.1 Flash accepts more context: 1M tokens versus 524K.
  • DeepSeek V4.1 Flash has downloadable open weights; the other is API-only.

Side by side

DeepSeek V4.1 FlashSolar Pro4
ProviderDeepSeekUpstage
Noometry Index50.341.5
Released2026-09-092026-08-06
WeightsOpenProprietary
Context window1M524K
Max output393K131K
Input $ / M tokens$0.15$0.30
Output $ / M tokens$0.60$1.20
Results tracked2518

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Category by category

Coding DeepSeek V4.1 Flash leads

DeepSeek V4.1 Flash: 52.8 (#29), Solar Pro4: 39.9 (#135)

BenchmarkDeepSeek V4.1 FlashSolar Pro4
LMArena WebDev16201371
LMArena Coding15111439
SciCode51.9%—
ALE-Bench1,092—

Reasoning DeepSeek V4.1 Flash leads

DeepSeek V4.1 Flash: 46.2 (#39), Solar Pro4: 27.3 (#107)

BenchmarkDeepSeek V4.1 FlashSolar Pro4
LMArena Hard Prompts14851398
NYT Connections (extended)89.6%—
CritPt14.3%—
DTBench89.9%—
LMCA47%—
Surface Evolver Bench46.3%—
Epoch Capabilities Index155.01—

Math DeepSeek V4.1 Flash leads

DeepSeek V4.1 Flash: 48.4 (#52), Solar Pro4: 36.1 (#129)

BenchmarkDeepSeek V4.1 FlashSolar Pro4
LMArena Math14931418
ProofBench54%—

Knowledge DeepSeek V4.1 Flash leads

DeepSeek V4.1 Flash: 41.6 (#97), Solar Pro4: 39.0 (#128)

BenchmarkDeepSeek V4.1 FlashSolar Pro4
LMArena Expert15051421

Multilingual DeepSeek V4.1 Flash leads

DeepSeek V4.1 Flash: 55.5 (#29), Solar Pro4: 49.0 (#134)

BenchmarkDeepSeek V4.1 FlashSolar Pro4
LMArena Non-English14521362
LMArena Chinese15061417
LMArena French14481403
LMArena Russian14731360
LMArena Spanish14991408
LMArena German—1351
LMArena Japanese—1300
LMArena Korean—1383

Instruction Following DeepSeek V4.1 Flash leads

DeepSeek V4.1 Flash: 77.6 (#24), Solar Pro4: 72.8 (#128)

BenchmarkDeepSeek V4.1 FlashSolar Pro4
LMArena Instruction Following14751376

Long Context DeepSeek V4.1 Flash leads

DeepSeek V4.1 Flash: 45.2 (#46), Solar Pro4: 42.0 (#125)

BenchmarkDeepSeek V4.1 FlashSolar Pro4
LMArena Longer Query14761379

Writing & Preference DeepSeek V4.1 Flash leads

DeepSeek V4.1 Flash: 65.8 (#43), Solar Pro4: 56.7 (#133)

BenchmarkDeepSeek V4.1 FlashSolar Pro4
LMArena Text14651386
LMArena Creative Writing14361313
LMArena Multi-Turn14601391
EQ-Bench Creative Writing1540—

Frequently asked questions

Is DeepSeek V4.1 Flash better than Solar Pro4?

DeepSeek V4.1 Flash is the stronger model overall, scoring 50.3 to 41.5 on the Noometry Index.

Which is cheaper, DeepSeek V4.1 Flash or Solar Pro4?

DeepSeek V4.1 Flash is cheaper. It lists at $0.15 per million input tokens and $0.60 per million output tokens; Solar Pro4 lists at $0.30 and $1.20.

Is DeepSeek V4.1 Flash or Solar Pro4 better for coding?

DeepSeek V4.1 Flash scores higher on coding benchmarks: 52.8 versus 39.9 in the Noometry coding category.

Which has the bigger context window?

DeepSeek V4.1 Flash does, with 1M tokens against 524K.

How many benchmarks do DeepSeek V4.1 Flash and Solar Pro4 share?

15 benchmarks have published results for both models. DeepSeek V4.1 Flash has 25 scored results on Noometry and Solar Pro4 has 18.

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