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DeepSeek V4 Flash 0423 vs GPT-5.4 Nano

DeepSeek V4 Flash 0423 leads GPT-5.4 Nano on the Artificial Analysis Intelligence Index, 24.4 to 20.7, and DeepSeek V4 Flash 0423 costs 4.5x less per output token ($0.28 vs $1.25 per million). Updated October 21, 2026; 37 benchmarks have a result for both.

Replace DeepSeek V4 Flash 0423 Replace GPT-5.4 Nano
DeepSeek V4 Flash 0423DeepSeek
Coding
No data
Overall
No data
Output $/M
$0.28
33
GPT-5.4 NanoOpenAI
Coding
44.8
Overall
45.7
Output $/M
$1.25
4
vs boards won of 37 shared

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

Only GPT-5.4 Nano has a coding score, 44.8 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 4.5x cheaper ($0.28 vs $1.25 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 NanoOpenAI44.8/1002 independent benchmarks$0.14 per solved task
Shared results
37
DeepSeek V4 Flash 0423 only
12
GPT-5.4 Nano only
48
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 Nano 44.8 from 2 benchmarks.
Widest category
Knowledge, 11.7 points apart on average over 4 shared benchmarks.
Widest single gap
LMArena Text: creative writing: DeepSeek V4 Flash 0423 1403 against GPT-5.4 Nano 1315, 14.8 points apart on a 0 to 100 scale.
Output price
DeepSeek V4 Flash 0423 $0.28 against GPT-5.4 Nano $1.25 per million output tokens, 4.5x apart.
Context window
DeepSeek V4 Flash 0423 takes 1.05M tokens, GPT-5.4 Nano 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 NanoTies
Coding23
Intelligence20
Agentic work10
Reasoning40
Math20
Knowledge40
General181
All shared boards334
CodingLike-for-likeSix of these boards feed the Vibe Coding Index23
Coding benchmarks for DeepSeek V4 Flash 0423 and GPT-5.4 Nano
BenchmarkDeepSeek V4 Flash 0423GPT-5.4 NanoLeader
LMArena WebDev1582Not measuredOnly DeepSeek V4 Flash 0423 measured
AA Coding Index52.056.1GPT-5.4 Nano
LiveCodeBench (Vals AI)Not measured84.0%Only GPT-5.4 Nano measured
SWE-bench Verified (Vals AI)Not measured69.8%Only GPT-5.4 Nano measured
Vibe Code Bench (Vals AI)Not measured26.1%Only GPT-5.4 Nano measured
Code migration (Vals AI)Not measured14.5%Only GPT-5.4 Nano measured
Terminal-Bench 2.1 (Vals AI)Not measured41.6%Only GPT-5.4 Nano measured
SciCodeNot measured47.2%Only GPT-5.4 Nano measured
Terminal-Bench Hard (Artificial Analysis run)Not measured42.4%Only GPT-5.4 Nano measured
WeirdML45.6%49.2%GPT-5.4 Nano
ALE-Bench678.21004.5GPT-5.4 Nano
LMArena Text: coding14571404DeepSeek V4 Flash 0423
LMArena Text: software and IT14531402DeepSeek V4 Flash 0423
LMArena WebDev: React1585Not measuredOnly DeepSeek V4 Flash 0423 measured
LMArena WebDev: HTML1558Not measuredOnly DeepSeek V4 Flash 0423 measured
Neither model has a result on the other 24 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index20
Intelligence benchmarks for DeepSeek V4 Flash 0423 and GPT-5.4 Nano
BenchmarkDeepSeek V4 Flash 0423GPT-5.4 NanoLeader
AA Intelligence Index24.420.7DeepSeek V4 Flash 0423
Epoch Capabilities Index146.1146.0DeepSeek V4 Flash 0423
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 Nano
BenchmarkDeepSeek V4 Flash 0423GPT-5.4 NanoLeader
AA Agentic Index26.316.0DeepSeek V4 Flash 0423
Finance Agent (Vals AI)Not measured38.2%Only GPT-5.4 Nano measured
Tax Agent Bench (Vals AI)Not measured5.0%Only GPT-5.4 Nano measured
Legal Research Bench (Vals AI)Not measured6.3%Only GPT-5.4 Nano measured
Excel Modeling Benchmark (Vals AI)Not measured44.8%Only GPT-5.4 Nano measured
τ²-Bench TelecomNot measured76.0%Only GPT-5.4 Nano measured
Neither model has a result on the other 35 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 Nano
BenchmarkDeepSeek V4 Flash 0423GPT-5.4 NanoLeader
GPQA DiamondNot measured77.5%Only GPT-5.4 Nano measured
MMMU Pro (Vals AI)Not measured73.6%Only GPT-5.4 Nano measured
GPQA Diamond (Artificial Analysis run)Not measured81.7%Only GPT-5.4 Nano measured
Humanity's Last Exam (Artificial Analysis run)Not measured28.3%Only GPT-5.4 Nano measured
GPQA Diamond (Epoch AI run)Not measured78.5%Only GPT-5.4 Nano measured
ARC-AGINot measured51.5%Only GPT-5.4 Nano measured
ARC-AGI-2Not measured5.7%Only GPT-5.4 Nano measured
SimpleBench46.3%Not measuredOnly DeepSeek V4 Flash 0423 measured
Chess puzzlesNot measured45.0%Only GPT-5.4 Nano measured
Mystery game puzzlesNot measured9.0%Only GPT-5.4 Nano measured
LMArena Text: hard prompts14441381DeepSeek V4 Flash 0423
LMArena Text: expert14411396DeepSeek V4 Flash 0423
LMArena Text: hard prompts in English14491387DeepSeek V4 Flash 0423
LMArena Vision: diagramsNot measured1210Only GPT-5.4 Nano measured
LMArena Vision: homeworkNot measured1225Only GPT-5.4 Nano measured
Kagi LLM Benchmark52.2%39.7%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 Nano
BenchmarkDeepSeek V4 Flash 0423GPT-5.4 NanoLeader
AIMENot measured88.8%Only GPT-5.4 Nano measured
OTIS Mock AIMENot measured87.8%Only GPT-5.4 Nano measured
FrontierMath, tiers 1 to 3Not measured44.9%Only GPT-5.4 Nano measured
FrontierMath, tier 4Not measured12.2%Only GPT-5.4 Nano measured
ProofBenchNot measured5.0%Only GPT-5.4 Nano measured
LMArena Text: math14261405DeepSeek V4 Flash 0423
LMArena Text: mathematical work14321409DeepSeek 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 Nano
BenchmarkDeepSeek V4 Flash 0423GPT-5.4 NanoLeader
MMLU ProNot measured77.2%Only GPT-5.4 Nano measured
LegalBench (Vals AI)Not measured77.9%Only GPT-5.4 Nano measured
CaseLaw (Vals AI)Not measured51.9%Only GPT-5.4 Nano measured
CorpFin (Vals AI)Not measured61.2%Only GPT-5.4 Nano measured
TaxEval (Vals AI)Not measured67.4%Only GPT-5.4 Nano measured
MortgageTax (Vals AI)Not measured59.1%Only GPT-5.4 Nano measured
MedCode (Vals AI)Not measured41.0%Only GPT-5.4 Nano measured
SimpleQA VerifiedNot measured11.7%Only GPT-5.4 Nano measured
LMArena Text: science14461374DeepSeek V4 Flash 0423
LMArena Text: medicine and healthcare14481369DeepSeek V4 Flash 0423
LMArena Text: legal and government14391368DeepSeek V4 Flash 0423
LMArena Text: business and finance14251366DeepSeek V4 Flash 0423
Neither model has a result on the other 6 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 Nano
BenchmarkDeepSeek V4 Flash 0423GPT-5.4 NanoLeader
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 index181
General benchmarks for DeepSeek V4 Flash 0423 and GPT-5.4 Nano
BenchmarkDeepSeek V4 Flash 0423GPT-5.4 NanoLeader
SAGE (Vals AI)Not measured38.1%Only GPT-5.4 Nano measured
MedScribe (Vals AI)Not measured77.1%Only GPT-5.4 Nano measured
Vals Multimodal IndexNot measured47.6%Only GPT-5.4 Nano measured
IFBenchNot measured75.9%Only GPT-5.4 Nano measured
Long context reasoning (AA-LCR)Not measured76.7%Only GPT-5.4 Nano measured
DTBench86.4%80.3%DeepSeek V4 Flash 0423
LMCA35.9%36.9%GPT-5.4 Nano
LMArena Text14321372DeepSeek V4 Flash 0423
LMArena Text: instruction following14211362DeepSeek V4 Flash 0423
LMArena Text: creative writing14031315DeepSeek V4 Flash 0423
LMArena VisionNot measured1196Only GPT-5.4 Nano measured
LMArena Text: English14411381DeepSeek V4 Flash 0423
LMArena Text: non-English14191359DeepSeek V4 Flash 0423
LMArena Text: Chinese14631391DeepSeek V4 Flash 0423
LMArena Text: German14191368DeepSeek V4 Flash 0423
LMArena Text: Japanese13891343DeepSeek V4 Flash 0423
LMArena Text: Korean13831321DeepSeek V4 Flash 0423
LMArena Text: French14391395DeepSeek V4 Flash 0423
LMArena Text: Spanish14361371DeepSeek V4 Flash 0423
LMArena Text: Russian14271363DeepSeek V4 Flash 0423
LMArena Text: Polish14361366DeepSeek V4 Flash 0423
LMArena Text: multi-turn14491382DeepSeek V4 Flash 0423
LMArena Text: longer queries14341365DeepSeek V4 Flash 0423
LMArena Text: writing and language14101338DeepSeek V4 Flash 0423
LMArena Text: entertainment and media14001325DeepSeek V4 Flash 0423
LMArena Vision: EnglishNot measured1202Only GPT-5.4 Nano measured
LMArena Vision: ChineseNot measured1232Only GPT-5.4 Nano measured
LMArena Vision: reading textNot measured1204Only GPT-5.4 Nano measured
LMArena Vision: humorNot measured1161Only GPT-5.4 Nano measured
LMArena Vision: recognizing thingsNot measured1141Only GPT-5.4 Nano measured
LMArena Vision: creative writingNot measured1159Only GPT-5.4 Nano measured
Neither model has a result on the other 15 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 Nano
BenchmarkDeepSeek V4 Flash 0423GPT-5.4 NanoLeader
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 Nano$0.0008Fits 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 Nano$0.014Fits 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 Nano$0.052Fits 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 Nano
SpecificationDeepSeek V4 Flash 0423OpenAI GPT-5.4 Nano
MakerDeepSeekOpenAI
WeightsOpen weightsNo public weights listed
ReleasedApril 24, 2026March 17, 2026
Context window1.05M400K
Input $/Mtok$0.13$0.20
Output $/Mtok$0.28$1.25
Coding indexNot benchmarked44.8
Independent measurements behind it12
Cost per solved taskNot computable$0.14
SourceOpenRouter listingOpenRouter listing

Questions

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

Only GPT-5.4 Nano has a coding score, 44.8 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 4.5x cheaper ($0.28 vs $1.25 per million) and a larger context window (1.05M against 400K tokens).

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

DeepSeek V4 Flash 0423 costs $0.13 per million input tokens and $0.28 per million output tokens; GPT-5.4 Nano costs $0.20 and $1.25. Cost per solved task is known for GPT-5.4 Nano only.

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

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

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

37 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 Nano's on 2. Where only one model has a result, the page says so instead of naming a winner.

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