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DeepSeek V4 Flash 0423 vs Solar Pro 4

Solar Pro 4 leads DeepSeek V4 Flash 0423 on the Artificial Analysis Intelligence Index, 28.2 to 24.4, and DeepSeek V4 Flash 0423 costs 2.1x less per output token ($0.28 vs $0.60 per million). Updated October 22, 2026; 40 benchmarks have a result for both.

Replace DeepSeek V4 Flash 0423 Replace Solar Pro 4
DeepSeek V4 Flash 0423DeepSeek
Coding
No data
Overall
No data
Output $/M
$0.28
37
Solar Pro 4Upstage
Coding
No data
Overall
No data
Output $/M
$0.60
3
vs boards won of 40 shared

DeepSeek V4 Flash 0423 or Solar Pro 4: which to pick

Neither model has a coding score yet, so the two cannot be ranked on coding.

Pick DeepSeek V4 Flash 0423 for output tokens 2.1x cheaper ($0.28 vs $0.60 per million) and a larger context window (1.05M against 524K tokens).

Model ADeepSeek V4 Flash 0423DeepSeekNot benchmarked1 independent benchmarkNo cost per solved taskModel BSolar Pro 4UpstageNot benchmarked1 independent benchmarkNo cost per solved task
Shared results
40
DeepSeek V4 Flash 0423 only
9
Solar Pro 4 only
5
Like-for-like categories
7 of 9

Only benchmarks that tested both models count toward a pick; a result only one model has is shown but not compared.

Which one for your work

Each card is decided by one number both models carry. Where only one has it, the card says so and makes no call.

At a glance

Coding index
DeepSeek V4 Flash 0423 not benchmarked, Solar Pro 4 not benchmarked.
Widest category
Coding, 17.5 points apart on average over 7 shared benchmarks.
Widest single gap
LMArena WebDev: React: DeepSeek V4 Flash 0423 1585 against Solar Pro 4 1363, 36.9 points apart on a 0 to 100 scale.
Output price
DeepSeek V4 Flash 0423 $0.28 against Solar Pro 4 $0.60 per million output tokens, 2.1x apart.
Context window
DeepSeek V4 Flash 0423 takes 1.05M tokens, Solar Pro 4 524K.

Benchmark by benchmark

First the score: boards each model leads, per category, where both have a result. Then every board, a category to a fold; bars are each result on a 0 to 100 scale, so compare the two in a row, not one row with another.

Boards won, where both have a result
CategoryDeepSeek V4 Flash 0423BarsSolar Pro 4Ties
Coding61
Intelligence01
Reasoning30
Math20
Knowledge40
Web design51
General170
All shared boards373
CodingLike-for-likeSix of these boards feed the Vibe Coding Index61
Coding benchmarks for DeepSeek V4 Flash 0423 and Solar Pro 4
BenchmarkDeepSeek V4 Flash 0423Solar Pro 4Leader
LMArena WebDev15821371DeepSeek V4 Flash 0423
AA Coding Index52.052.7Solar Pro 4
SciCodeNot measured48.0%Only Solar Pro 4 measured
WeirdML45.6%Not measuredOnly DeepSeek V4 Flash 0423 measured
ALE-Bench678.2179.3DeepSeek V4 Flash 0423
LMArena Text: coding14571438DeepSeek V4 Flash 0423
LMArena Text: software and IT14531431DeepSeek V4 Flash 0423
LMArena WebDev: React15851363DeepSeek V4 Flash 0423
LMArena WebDev: HTML15581371DeepSeek V4 Flash 0423
Neither model has a result on the other 30 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index01
Intelligence benchmarks for DeepSeek V4 Flash 0423 and Solar Pro 4
BenchmarkDeepSeek V4 Flash 0423Solar Pro 4Leader
AA Intelligence Index24.428.2Solar Pro 4
Epoch Capabilities Index146.1Not measuredOnly DeepSeek V4 Flash 0423 measured
Agentic workDirectional onlyPublic boards, shown as published, kept out of the index2 boards, none shared
Agentic work benchmarks for DeepSeek V4 Flash 0423 and Solar Pro 4
BenchmarkDeepSeek V4 Flash 0423Solar Pro 4Leader
AA Agentic Index26.3Not measuredOnly DeepSeek V4 Flash 0423 measured
Design Arena: agents building web appsNot measured1105Only Solar Pro 4 measured
Neither model has a result on the other 39 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index30
Reasoning benchmarks for DeepSeek V4 Flash 0423 and Solar Pro 4
BenchmarkDeepSeek V4 Flash 0423Solar Pro 4Leader
GPQA Diamond (Artificial Analysis run)Not measured89.1%Only Solar Pro 4 measured
Humanity's Last Exam (Artificial Analysis run)Not measured29.8%Only Solar Pro 4 measured
SimpleBench46.3%Not measuredOnly DeepSeek V4 Flash 0423 measured
LMArena Text: hard prompts14441400DeepSeek V4 Flash 0423
LMArena Text: expert14411428DeepSeek V4 Flash 0423
LMArena Text: hard prompts in English14491427DeepSeek V4 Flash 0423
Kagi LLM Benchmark52.2%Not measuredOnly DeepSeek V4 Flash 0423 measured
Neither model has a result on the other 15 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index20
Math benchmarks for DeepSeek V4 Flash 0423 and Solar Pro 4
BenchmarkDeepSeek V4 Flash 0423Solar Pro 4Leader
LMArena Text: math14261421DeepSeek V4 Flash 0423
LMArena Text: mathematical work14321427DeepSeek V4 Flash 0423
Neither model has a result on the other 11 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index40
Knowledge benchmarks for DeepSeek V4 Flash 0423 and Solar Pro 4
BenchmarkDeepSeek V4 Flash 0423Solar Pro 4Leader
LMArena Text: science14461404DeepSeek V4 Flash 0423
LMArena Text: medicine and healthcare14481374DeepSeek V4 Flash 0423
LMArena Text: legal and government14391383DeepSeek V4 Flash 0423
LMArena Text: business and finance14251381DeepSeek V4 Flash 0423
Neither model has a result on the other 14 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index51
Web design benchmarks for DeepSeek V4 Flash 0423 and Solar Pro 4
BenchmarkDeepSeek V4 Flash 0423Solar Pro 4Leader
Design Arena: websites12071176DeepSeek V4 Flash 0423
Design Arena: UI components11621147DeepSeek V4 Flash 0423
Design Arena: game dev11961169DeepSeek V4 Flash 0423
Design Arena: data viz11271177Solar Pro 4
Design Arena: 3D11881178DeepSeek V4 Flash 0423
Design Arena: all code categories12051182DeepSeek V4 Flash 0423
Design Arena: SVG1155Not measuredOnly DeepSeek V4 Flash 0423 measured
Design Arena: ASCII art1109Not measuredOnly DeepSeek V4 Flash 0423 measured
Neither model has a result on the other 1 board here
GeneralLike-for-likePublic boards, shown as published, kept out of the index170
General benchmarks for DeepSeek V4 Flash 0423 and Solar Pro 4
BenchmarkDeepSeek V4 Flash 0423Solar Pro 4Leader
Long context reasoning (AA-LCR)Not measured70.7%Only Solar Pro 4 measured
DTBench86.4%Not measuredOnly DeepSeek V4 Flash 0423 measured
LMCA35.9%Not measuredOnly DeepSeek V4 Flash 0423 measured
LMArena Text14321388DeepSeek V4 Flash 0423
LMArena Text: instruction following14211375DeepSeek V4 Flash 0423
LMArena Text: creative writing14031317DeepSeek V4 Flash 0423
LMArena Text: English14411414DeepSeek V4 Flash 0423
LMArena Text: non-English14191363DeepSeek V4 Flash 0423
LMArena Text: Chinese14631422DeepSeek V4 Flash 0423
LMArena Text: German14191358DeepSeek V4 Flash 0423
LMArena Text: Japanese13891320DeepSeek V4 Flash 0423
LMArena Text: Korean13831383DeepSeek V4 Flash 0423
LMArena Text: French14391400DeepSeek V4 Flash 0423
LMArena Text: Spanish14361409DeepSeek V4 Flash 0423
LMArena Text: Russian14271357DeepSeek V4 Flash 0423
LMArena Text: Polish14361304DeepSeek V4 Flash 0423
LMArena Text: multi-turn14491385DeepSeek V4 Flash 0423
LMArena Text: longer queries14341382DeepSeek V4 Flash 0423
LMArena Text: writing and language14101344DeepSeek V4 Flash 0423
LMArena Text: entertainment and media14001332DeepSeek V4 Flash 0423
Neither model has a result on the other 26 boards here
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
Image generation benchmarks for DeepSeek V4 Flash 0423 and Solar Pro 4
BenchmarkDeepSeek V4 Flash 0423Solar Pro 4Leader
Neither model has a result on 5 boards here

What each workload costs

Three fixed token mixes at each model's listed price, so per-token rates become a bill.

Chat turn

1K input + 500 output tokens

DeepSeek V4 Flash 0423$0.0003Fits in one request
Solar Pro 4$0.0004Fits in one request

DeepSeek V4 Flash 0423 costs less

Repository review

50K input + 3K output tokens

DeepSeek V4 Flash 0423$0.0078Fits in one request
Solar Pro 4$0.0093Fits in one request

DeepSeek V4 Flash 0423 costs less

Agent loop

200K input + 10K output tokens

DeepSeek V4 Flash 0423$0.031Fits in one request
Solar Pro 4$0.036Fits in one request

DeepSeek V4 Flash 0423 costs less

Listed OpenRouter rates, without cache or batch discounts. A workload that does not fit a model's context window would need splitting.

Specification differences

The leading value in a row is marked; a row with a missing value names no leader. Our two rows are marked in red.

Specifications of DeepSeek V4 Flash 0423 and Solar Pro 4
SpecificationDeepSeek V4 Flash 0423Upstage Solar Pro 4
MakerDeepSeekUpstage
WeightsOpen weightsNo public weights listed
ReleasedApril 24, 2026August 10, 2026
Context window1.05M524K
Input $/Mtok$0.14$0.15
Output $/Mtok$0.28$0.60
Coding indexNot benchmarkedNot benchmarked
Independent measurements behind it11
Cost per solved taskNot computableNot computable
SourceOpenRouter listingOpenRouter listing

Questions

Is DeepSeek V4 Flash 0423 better than Solar Pro 4 for coding?

Neither model has a coding score yet, so the two cannot be ranked on coding. Pick DeepSeek V4 Flash 0423 for output tokens 2.1x cheaper ($0.28 vs $0.60 per million) and a larger context window (1.05M against 524K tokens).

Which is cheaper, DeepSeek V4 Flash 0423 or Solar Pro 4?

DeepSeek V4 Flash 0423 costs $0.14 per million input tokens and $0.28 per million output tokens; Solar Pro 4 costs $0.15 and $0.60. Cost per solved task is known for neither of them.

Which has the bigger context window, DeepSeek V4 Flash 0423 or Solar Pro 4?

DeepSeek V4 Flash 0423, with 1.05M tokens against 524K.

How many benchmarks is the DeepSeek V4 Flash 0423 vs Solar Pro 4 comparison based on?

40 benchmarks have a result for both models as of October 22, 2026. DeepSeek V4 Flash 0423's coding index rests on 1 independent benchmark and Solar Pro 4's on 1. Where only one model has a result, the page says so instead of naming a winner.

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