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DeepSeek V4 Flash 0423 vs o3 Mini

DeepSeek V4 Flash 0423 leads o3 Mini on the Artificial Analysis Intelligence Index, 24.4 to 12.5, and DeepSeek V4 Flash 0423 costs 15.7x less per output token ($0.28 vs $4.40 per million). Updated October 22, 2026; 34 benchmarks have a result for both.

Replace DeepSeek V4 Flash 0423 Replace o3 Mini
DeepSeek V4 Flash 0423DeepSeek
Coding
No data
Overall
No data
Output $/M
$0.28
34
o3 MiniOpenAI
Coding
No data
Overall
38.0
Output $/M
$4.40
0
vs boards won of 34 shared

DeepSeek V4 Flash 0423 or o3 Mini: 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 15.7x cheaper ($0.28 vs $4.40 per million) and a larger context window (1.05M against 200K tokens).

Model ADeepSeek V4 Flash 0423DeepSeekNot benchmarked1 independent benchmarkNo cost per solved taskModel Bo3 MiniOpenAINot benchmarkedNo coding benchmarkNo cost per solved task
Shared results
34
DeepSeek V4 Flash 0423 only
15
o3 Mini only
37
Like-for-like categories
6 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, o3 Mini not benchmarked.
Widest category
Knowledge, 18.7 points apart on average over 4 shared benchmarks.
Widest single gap
LMArena Text: Polish: DeepSeek V4 Flash 0423 1436 against o3 Mini 1294, 23.6 points apart on a 0 to 100 scale.
Output price
DeepSeek V4 Flash 0423 $0.28 against o3 Mini $4.40 per million output tokens, 15.7x apart.
Context window
DeepSeek V4 Flash 0423 takes 1.05M tokens, o3 Mini 200K.

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 0423Barso3 MiniTies
Coding30
Intelligence20
Reasoning40
Math20
Knowledge40
General190
All shared boards340
CodingLike-for-likeSix of these boards feed the Vibe Coding Index30
Coding benchmarks for DeepSeek V4 Flash 0423 and o3 Mini
BenchmarkDeepSeek V4 Flash 0423o3 MiniLeader
Aider polyglotNot measured60.4%Only o3 Mini measured
SWE-bench VerifiedNot measured42.4%Only o3 Mini measured
SWE-bench LiteNot measured32.3%Only o3 Mini measured
LMArena WebDev1582Not measuredOnly DeepSeek V4 Flash 0423 measured
AA Coding Index52.0Not measuredOnly DeepSeek V4 Flash 0423 measured
LiveCodeBench (Vals AI)Not measured71.5%Only o3 Mini measured
LiveCodeBench (Artificial Analysis run)Not measured73.4%Only o3 Mini measured
SciCodeNot measured42.8%Only o3 Mini measured
Terminal-Bench Hard (Artificial Analysis run)Not measured6.8%Only o3 Mini measured
GSO-BenchNot measured1.3%Only o3 Mini measured
WeirdML45.6%43.7%DeepSeek V4 Flash 0423
CybenchNot measured22.5%Only o3 Mini measured
ALE-Bench678.2Not measuredOnly DeepSeek V4 Flash 0423 measured
LMArena Text: coding14571378DeepSeek V4 Flash 0423
LMArena Text: software and IT14531364DeepSeek V4 Flash 0423
LMArena WebDev: React1585Not measuredOnly DeepSeek V4 Flash 0423 measured
LMArena WebDev: HTML1558Not measuredOnly DeepSeek V4 Flash 0423 measured
SciCodeNot measured7.7%Only o3 Mini measured
Neither model has a result on the other 21 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index20
Intelligence benchmarks for DeepSeek V4 Flash 0423 and o3 Mini
BenchmarkDeepSeek V4 Flash 0423o3 MiniLeader
AA Intelligence Index24.412.5DeepSeek V4 Flash 0423
Epoch Capabilities Index146.1140.2DeepSeek V4 Flash 0423
Agentic workDirectional onlyPublic boards, shown as published, kept out of the index2 boards, none shared
Agentic work benchmarks for DeepSeek V4 Flash 0423 and o3 Mini
BenchmarkDeepSeek V4 Flash 0423o3 MiniLeader
AA Agentic Index26.3Not measuredOnly DeepSeek V4 Flash 0423 measured
τ²-Bench TelecomNot measured31.3%Only o3 Mini measured
Neither model has a result on the other 39 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index40
Reasoning benchmarks for DeepSeek V4 Flash 0423 and o3 Mini
BenchmarkDeepSeek V4 Flash 0423o3 MiniLeader
GPQA DiamondNot measured75.5%Only o3 Mini measured
GPQA Diamond (Artificial Analysis run)Not measured77.3%Only o3 Mini measured
Humanity's Last Exam (Artificial Analysis run)Not measured12.0%Only o3 Mini measured
GPQA Diamond (Epoch AI run)Not measured77.0%Only o3 Mini measured
ARC-AGINot measured34.5%Only o3 Mini measured
ARC-AGI-2Not measured3.0%Only o3 Mini measured
SimpleBench46.3%22.8%DeepSeek V4 Flash 0423
Chess puzzlesNot measured15.0%Only o3 Mini measured
Mystery game puzzlesNot measured7.0%Only o3 Mini measured
LMArena Text: hard prompts14441365DeepSeek V4 Flash 0423
LMArena Text: expert14411364DeepSeek V4 Flash 0423
LMArena Text: hard prompts in English14491375DeepSeek V4 Flash 0423
Kagi LLM Benchmark52.2%Not measuredOnly DeepSeek V4 Flash 0423 measured
Neither model has a result on the other 9 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index20
Math benchmarks for DeepSeek V4 Flash 0423 and o3 Mini
BenchmarkDeepSeek V4 Flash 0423o3 MiniLeader
AIMENot measured86.5%Only o3 Mini measured
MATH 500 (Vals AI)Not measured91.8%Only o3 Mini measured
MGSM (Vals AI)Not measured91.3%Only o3 Mini measured
OTIS Mock AIMENot measured76.9%Only o3 Mini measured
FrontierMath, tiers 1 to 3Not measured18.6%Only o3 Mini measured
FrontierMath, tier 4Not measured0.0%Only o3 Mini measured
MATH level 5Not measured96.5%Only o3 Mini measured
LMArena Text: math14261396DeepSeek V4 Flash 0423
LMArena Text: mathematical work14321399DeepSeek V4 Flash 0423
Neither model has a result on the other 4 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index40
Knowledge benchmarks for DeepSeek V4 Flash 0423 and o3 Mini
BenchmarkDeepSeek V4 Flash 0423o3 MiniLeader
MMLU ProNot measured78.7%Only o3 Mini measured
LegalBench (Vals AI)Not measured71.5%Only o3 Mini measured
CorpFin (Vals AI)Not measured45.3%Only o3 Mini measured
TaxEval (Vals AI)Not measured69.4%Only o3 Mini measured
MedQA (Vals AI)Not measured94.8%Only o3 Mini measured
MMLU Pro (Artificial Analysis run)Not measured80.2%Only o3 Mini measured
SimpleQA VerifiedNot measured15.3%Only o3 Mini measured
LMArena Text: science14461339DeepSeek V4 Flash 0423
LMArena Text: medicine and healthcare14481330DeepSeek V4 Flash 0423
LMArena Text: legal and government14391328DeepSeek V4 Flash 0423
LMArena Text: business and finance14251313DeepSeek V4 Flash 0423
Neither model has a result on the other 7 boards here
Web designDirectional onlyPublic boards, shown as published, kept out of the index8 boards, none shared
Web design benchmarks for DeepSeek V4 Flash 0423 and o3 Mini
BenchmarkDeepSeek V4 Flash 0423o3 MiniLeader
Design Arena: websites1207Not measuredOnly DeepSeek V4 Flash 0423 measured
Design Arena: UI components1162Not measuredOnly DeepSeek V4 Flash 0423 measured
Design Arena: game dev1196Not measuredOnly DeepSeek V4 Flash 0423 measured
Design Arena: data viz1127Not measuredOnly DeepSeek V4 Flash 0423 measured
Design Arena: 3D1188Not measuredOnly DeepSeek V4 Flash 0423 measured
Design Arena: all code categories1205Not measuredOnly DeepSeek V4 Flash 0423 measured
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 index190
General benchmarks for DeepSeek V4 Flash 0423 and o3 Mini
BenchmarkDeepSeek V4 Flash 0423o3 MiniLeader
IFBenchNot measured67.1%Only o3 Mini measured
Long context reasoning (AA-LCR)Not measured43.0%Only o3 Mini measured
DTBench86.4%68.8%DeepSeek V4 Flash 0423
LMCA35.9%19.0%DeepSeek V4 Flash 0423
Fiction.LiveBenchNot measured50.0%Only o3 Mini measured
Creative writing (Lech Mazur)Not measured61.7%Only o3 Mini measured
LMArena Text14321337DeepSeek V4 Flash 0423
LMArena Text: instruction following14211337DeepSeek V4 Flash 0423
LMArena Text: creative writing14031286DeepSeek V4 Flash 0423
LMArena Text: English14411351DeepSeek V4 Flash 0423
LMArena Text: non-English14191319DeepSeek V4 Flash 0423
LMArena Text: Chinese14631379DeepSeek V4 Flash 0423
LMArena Text: German14191303DeepSeek V4 Flash 0423
LMArena Text: Japanese13891286DeepSeek V4 Flash 0423
LMArena Text: Korean13831313DeepSeek V4 Flash 0423
LMArena Text: French14391334DeepSeek V4 Flash 0423
LMArena Text: Spanish14361321DeepSeek V4 Flash 0423
LMArena Text: Russian14271304DeepSeek V4 Flash 0423
LMArena Text: Polish14361294DeepSeek V4 Flash 0423
LMArena Text: multi-turn14491320DeepSeek V4 Flash 0423
LMArena Text: longer queries14341343DeepSeek V4 Flash 0423
LMArena Text: writing and language14101313DeepSeek V4 Flash 0423
LMArena Text: entertainment and media14001283DeepSeek V4 Flash 0423
Neither model has a result on the other 23 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 o3 Mini
BenchmarkDeepSeek V4 Flash 0423o3 MiniLeader
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
o3 Mini$0.0033Fits 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
o3 Mini$0.068Fits 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
o3 Mini$0.264Exceeds the context window

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 o3 Mini
SpecificationDeepSeek V4 Flash 0423OpenAI o3 Mini
MakerDeepSeekOpenAI
WeightsOpen weightsNo public weights listed
ReleasedApril 24, 2026January 31, 2025
Context window1.05M200K
Input $/Mtok$0.14$1.10
Output $/Mtok$0.28$4.40
Coding indexNot benchmarkedNot benchmarked
Independent measurements behind it10
Cost per solved taskNot computableNot computable
SourceOpenRouter listingOpenRouter listing

Questions

Is DeepSeek V4 Flash 0423 better than o3 Mini 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 15.7x cheaper ($0.28 vs $4.40 per million) and a larger context window (1.05M against 200K tokens).

Which is cheaper, DeepSeek V4 Flash 0423 or o3 Mini?

DeepSeek V4 Flash 0423 costs $0.14 per million input tokens and $0.28 per million output tokens; o3 Mini costs $1.10 and $4.40. Cost per solved task is known for neither of them.

Which has the bigger context window, DeepSeek V4 Flash 0423 or o3 Mini?

DeepSeek V4 Flash 0423, with 1.05M tokens against 200K.

How many benchmarks is the DeepSeek V4 Flash 0423 vs o3 Mini comparison based on?

34 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 o3 Mini's on 0. Where only one model has a result, the page says so instead of naming a winner.

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