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DeepSeek V4 Flash 0423 vs GPT-5.4 Mini

DeepSeek V4 Flash 0423 leads GPT-5.4 Mini on the Artificial Analysis Intelligence Index, 24.4 to 24.1, and DeepSeek V4 Flash 0423 costs 16.1x less per output token ($0.28 vs $4.50 per million). Updated October 21, 2026; 40 benchmarks have a result for both.

Replace DeepSeek V4 Flash 0423 Replace GPT-5.4 Mini
DeepSeek V4 Flash 0423DeepSeek
Coding
No data
Overall
No data
Output $/M
$0.28
34
GPT-5.4 MiniOpenAI
Coding
35.8
Overall
44.0
Output $/M
$4.50
6
vs boards won of 40 shared

DeepSeek V4 Flash 0423 or GPT-5.4 Mini: which to pick

Only GPT-5.4 Mini has a coding score, 35.8 on the Vibe Coding Index; DeepSeek V4 Flash 0423 has none, so the two cannot be ranked on coding.

Pick DeepSeek V4 Flash 0423 for output tokens 16.1x cheaper ($0.28 vs $4.50 per million) and a larger context window (1.05M against 400K tokens).

Model ADeepSeek V4 Flash 0423DeepSeekNot benchmarked1 independent benchmarkNo cost per solved taskModel BGPT-5.4 MiniOpenAI35.8/1005 independent benchmarks$0.70 per solved task
Shared results
40
DeepSeek V4 Flash 0423 only
9
GPT-5.4 Mini only
49
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, GPT-5.4 Mini 35.8 from 5 benchmarks.
Widest category
Coding, 15.5 points apart on average over 8 shared benchmarks.
Widest single gap
LMArena WebDev: React: DeepSeek V4 Flash 0423 1585 against GPT-5.4 Mini 1386, 33.1 points apart on a 0 to 100 scale.
Output price
DeepSeek V4 Flash 0423 $0.28 against GPT-5.4 Mini $4.50 per million output tokens, 16.1x apart.
Context window
DeepSeek V4 Flash 0423 takes 1.05M tokens, GPT-5.4 Mini 400K.

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 0423BarsGPT-5.4 MiniTies
Coding53
Intelligence11
Agentic work10
Reasoning40
Math20
Knowledge40
General172
All shared boards346
CodingLike-for-likeSix of these boards feed the Vibe Coding Index53
Coding benchmarks for DeepSeek V4 Flash 0423 and GPT-5.4 Mini
BenchmarkDeepSeek V4 Flash 0423GPT-5.4 MiniLeader
LMArena WebDev15821397DeepSeek V4 Flash 0423
AA Coding Index52.056.1GPT-5.4 Mini
LiveCodeBench (Vals AI)Not measured81.5%Only GPT-5.4 Mini measured
SWE-bench Verified (Vals AI)Not measured73.0%Only GPT-5.4 Mini measured
Terminal-Bench 4 (Vals AI)Not measured2.5%Only GPT-5.4 Mini measured
Vibe Code Bench (Vals AI)Not measured48.0%Only GPT-5.4 Mini measured
Code migration (Vals AI)Not measured12.9%Only GPT-5.4 Mini measured
ProgramBench (Vals AI)Not measured0.0%Only GPT-5.4 Mini measured
Terminal-Bench 2.1 (Vals AI)Not measured54.7%Only GPT-5.4 Mini measured
SciCodeNot measured52.1%Only GPT-5.4 Mini measured
Terminal-Bench Hard (Artificial Analysis run)Not measured52.3%Only GPT-5.4 Mini measured
FrontierCodeNot measured27.0%Only GPT-5.4 Mini measured
WeirdML45.6%60.3%GPT-5.4 Mini
ALE-Bench678.21188.6GPT-5.4 Mini
LMArena Text: coding14571438DeepSeek V4 Flash 0423
LMArena Text: software and IT14531436DeepSeek V4 Flash 0423
LMArena WebDev: React15851386DeepSeek V4 Flash 0423
LMArena WebDev: HTML15581419DeepSeek V4 Flash 0423
Neither model has a result on the other 21 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index11
Intelligence benchmarks for DeepSeek V4 Flash 0423 and GPT-5.4 Mini
BenchmarkDeepSeek V4 Flash 0423GPT-5.4 MiniLeader
AA Intelligence Index24.424.1DeepSeek V4 Flash 0423
Epoch Capabilities Index146.1148.7GPT-5.4 Mini
Agentic workLike-for-likePublic boards, shown as published, kept out of the index10
Agentic work benchmarks for DeepSeek V4 Flash 0423 and GPT-5.4 Mini
BenchmarkDeepSeek V4 Flash 0423GPT-5.4 MiniLeader
AA Agentic Index26.317.9DeepSeek V4 Flash 0423
Finance Agent (Vals AI)Not measured45.4%Only GPT-5.4 Mini measured
Tax Agent Bench (Vals AI)Not measured8.8%Only GPT-5.4 Mini measured
Legal Research Bench (Vals AI)Not measured12.5%Only GPT-5.4 Mini measured
Excel Modeling Benchmark (Vals AI)Not measured45.4%Only GPT-5.4 Mini measured
τ²-Bench TelecomNot measured83.3%Only GPT-5.4 Mini measured
DeepResearch BenchNot measured36.3%Only GPT-5.4 Mini measured
Neither model has a result on the other 34 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index40
Reasoning benchmarks for DeepSeek V4 Flash 0423 and GPT-5.4 Mini
BenchmarkDeepSeek V4 Flash 0423GPT-5.4 MiniLeader
GPQA DiamondNot measured83.1%Only GPT-5.4 Mini measured
MMMU Pro (Vals AI)Not measured79.3%Only GPT-5.4 Mini measured
GPQA Diamond (Artificial Analysis run)Not measured87.5%Only GPT-5.4 Mini measured
Humanity's Last Exam (Artificial Analysis run)Not measured28.1%Only GPT-5.4 Mini measured
GPQA Diamond (Epoch AI run)Not measured86.9%Only GPT-5.4 Mini measured
ARC-AGINot measured63.7%Only GPT-5.4 Mini measured
ARC-AGI-2Not measured18.9%Only GPT-5.4 Mini measured
SimpleBench46.3%Not measuredOnly DeepSeek V4 Flash 0423 measured
Chess puzzlesNot measured23.0%Only GPT-5.4 Mini measured
Mystery game puzzlesNot measured11.0%Only GPT-5.4 Mini measured
LMArena Text: hard prompts14441424DeepSeek V4 Flash 0423
LMArena Text: expert14411435DeepSeek V4 Flash 0423
LMArena Text: hard prompts in English14491420DeepSeek V4 Flash 0423
LMArena Vision: diagramsNot measured1266Only GPT-5.4 Mini measured
LMArena Vision: homeworkNot measured1285Only GPT-5.4 Mini measured
Kagi LLM Benchmark52.2%37.9%DeepSeek V4 Flash 0423
Neither model has a result on the other 6 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index20
Math benchmarks for DeepSeek V4 Flash 0423 and GPT-5.4 Mini
BenchmarkDeepSeek V4 Flash 0423GPT-5.4 MiniLeader
AIMENot measured95.6%Only GPT-5.4 Mini measured
OTIS Mock AIMENot measured88.9%Only GPT-5.4 Mini measured
FrontierMath, tiers 1 to 3Not measured51.2%Only GPT-5.4 Mini measured
FrontierMath, tier 4Not measured9.8%Only GPT-5.4 Mini measured
ProofBenchNot measured21.0%Only GPT-5.4 Mini measured
LMArena Text: math14261418DeepSeek V4 Flash 0423
LMArena Text: mathematical work14321429DeepSeek V4 Flash 0423
Neither model has a result on the other 6 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index40
Knowledge benchmarks for DeepSeek V4 Flash 0423 and GPT-5.4 Mini
BenchmarkDeepSeek V4 Flash 0423GPT-5.4 MiniLeader
MMLU ProNot measured84.5%Only GPT-5.4 Mini measured
CaseLaw (Vals AI)Not measured51.7%Only GPT-5.4 Mini measured
CorpFin (Vals AI)Not measured60.9%Only GPT-5.4 Mini measured
TaxEval (Vals AI)Not measured71.2%Only GPT-5.4 Mini measured
MortgageTax (Vals AI)Not measured63.5%Only GPT-5.4 Mini measured
SimpleQA VerifiedNot measured29.4%Only GPT-5.4 Mini measured
LMArena Text: science14461417DeepSeek V4 Flash 0423
LMArena Text: medicine and healthcare14481395DeepSeek V4 Flash 0423
LMArena Text: legal and government14391414DeepSeek V4 Flash 0423
LMArena Text: business and finance14251418DeepSeek V4 Flash 0423
Neither model has a result on the other 8 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 GPT-5.4 Mini
BenchmarkDeepSeek V4 Flash 0423GPT-5.4 MiniLeader
Design Arena: websites1208Not measuredOnly DeepSeek V4 Flash 0423 measured
Design Arena: UI components1165Not measuredOnly DeepSeek V4 Flash 0423 measured
Design Arena: game dev1197Not measuredOnly DeepSeek V4 Flash 0423 measured
Design Arena: data viz1127Not measuredOnly DeepSeek V4 Flash 0423 measured
Design Arena: 3D1189Not 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 index172
General benchmarks for DeepSeek V4 Flash 0423 and GPT-5.4 Mini
BenchmarkDeepSeek V4 Flash 0423GPT-5.4 MiniLeader
SAGE (Vals AI)Not measured50.8%Only GPT-5.4 Mini measured
Vals Multimodal IndexNot measured54.2%Only GPT-5.4 Mini measured
IFBenchNot measured73.3%Only GPT-5.4 Mini measured
Long context reasoning (AA-LCR)Not measured77.0%Only GPT-5.4 Mini measured
DTBench86.4%80.0%DeepSeek V4 Flash 0423
LMCA35.9%40.8%GPT-5.4 Mini
LMArena Text14321412DeepSeek V4 Flash 0423
LMArena Text: instruction following14211405DeepSeek V4 Flash 0423
LMArena Text: creative writing14031370DeepSeek V4 Flash 0423
LMArena VisionNot measured1245Only GPT-5.4 Mini measured
LMArena Text: English14411412DeepSeek V4 Flash 0423
LMArena Text: non-English14191405DeepSeek V4 Flash 0423
LMArena Text: Chinese14631446DeepSeek V4 Flash 0423
LMArena Text: German14191408DeepSeek V4 Flash 0423
LMArena Text: Japanese13891375DeepSeek V4 Flash 0423
LMArena Text: Korean13831370DeepSeek V4 Flash 0423
LMArena Text: French14391441GPT-5.4 Mini
LMArena Text: Spanish14361405DeepSeek V4 Flash 0423
LMArena Text: Russian14271417DeepSeek V4 Flash 0423
LMArena Text: Polish14361415DeepSeek V4 Flash 0423
LMArena Text: multi-turn14491429DeepSeek V4 Flash 0423
LMArena Text: longer queries14341408DeepSeek V4 Flash 0423
LMArena Text: writing and language14101393DeepSeek V4 Flash 0423
LMArena Text: entertainment and media14001373DeepSeek V4 Flash 0423
LMArena Vision: EnglishNot measured1244Only GPT-5.4 Mini measured
LMArena Vision: ChineseNot measured1286Only GPT-5.4 Mini measured
LMArena Vision: reading textNot measured1253Only GPT-5.4 Mini measured
LMArena Vision: humorNot measured1235Only GPT-5.4 Mini measured
LMArena Vision: recognizing thingsNot measured1218Only GPT-5.4 Mini measured
LMArena Vision: creative writingNot measured1222Only GPT-5.4 Mini measured
Neither model has a result on the other 16 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 GPT-5.4 Mini
BenchmarkDeepSeek V4 Flash 0423GPT-5.4 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
GPT-5.4 Mini$0.0030Fits in one request

DeepSeek V4 Flash 0423 costs less

Repository review

50K input + 3K output tokens

DeepSeek V4 Flash 0423$0.0073Fits in one request
GPT-5.4 Mini$0.051Fits in one request

DeepSeek V4 Flash 0423 costs less

Agent loop

200K input + 10K output tokens

DeepSeek V4 Flash 0423$0.029Fits in one request
GPT-5.4 Mini$0.195Fits 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 GPT-5.4 Mini
SpecificationDeepSeek V4 Flash 0423OpenAI GPT-5.4 Mini
MakerDeepSeekOpenAI
WeightsOpen weightsNo public weights listed
ReleasedApril 24, 2026March 17, 2026
Context window1.05M400K
Input $/Mtok$0.13$0.75
Output $/Mtok$0.28$4.50
Coding indexNot benchmarked35.8
Independent measurements behind it15
Cost per solved taskNot computable$0.70
SourceOpenRouter listingOpenRouter listing

Questions

Is DeepSeek V4 Flash 0423 better than GPT-5.4 Mini for coding?

Only GPT-5.4 Mini has a coding score, 35.8 on the Vibe Coding Index; DeepSeek V4 Flash 0423 has none, so the two cannot be ranked on coding. Pick DeepSeek V4 Flash 0423 for output tokens 16.1x cheaper ($0.28 vs $4.50 per million) and a larger context window (1.05M against 400K tokens).

Which is cheaper, DeepSeek V4 Flash 0423 or GPT-5.4 Mini?

DeepSeek V4 Flash 0423 costs $0.13 per million input tokens and $0.28 per million output tokens; GPT-5.4 Mini costs $0.75 and $4.50. Cost per solved task is known for GPT-5.4 Mini only.

Which has the bigger context window, DeepSeek V4 Flash 0423 or GPT-5.4 Mini?

DeepSeek V4 Flash 0423, with 1.05M tokens against 400K.

How many benchmarks is the DeepSeek V4 Flash 0423 vs GPT-5.4 Mini comparison based on?

40 benchmarks have a result for both models as of October 21, 2026. DeepSeek V4 Flash 0423's coding index rests on 1 independent benchmark and GPT-5.4 Mini's on 5. Where only one model has a result, the page says so instead of naming a winner.

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