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DeepSeek V4 Flash 0423 vs Grok 4.3

Grok 4.3 leads DeepSeek V4 Flash 0423 on the Artificial Analysis Intelligence Index, 24.9 to 24.4, and DeepSeek V4 Flash 0423 costs 8.9x less per output token ($0.28 vs $2.50 per million). Updated October 22, 2026; 46 benchmarks have a result for both.

Replace DeepSeek V4 Flash 0423 Replace Grok 4.3
DeepSeek V4 Flash 0423DeepSeek
Coding
No data
Overall
No data
Output $/M
$0.28
38
Grok 4.3xAI
Coding
37.4
Overall
53.1
Output $/M
$2.50
8
vs boards won of 46 shared

DeepSeek V4 Flash 0423 or Grok 4.3: which to pick

Only Grok 4.3 has a coding score, 37.4 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 8.9x cheaper ($0.28 vs $2.50 per million) and a larger context window (1.05M against 1M tokens).

Model ADeepSeek V4 Flash 0423DeepSeekNot benchmarked1 independent benchmarkNo cost per solved taskModel BGrok 4.3xAI37.4/1003 independent benchmarks$0.31 per solved task
Shared results
46
DeepSeek V4 Flash 0423 only
3
Grok 4.3 only
59
Like-for-like categories
8 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, Grok 4.3 37.4 from 3 benchmarks.
Widest category
Coding, 17.3 points apart on average over 8 shared benchmarks.
Widest single gap
LMArena WebDev: React: DeepSeek V4 Flash 0423 1585 against Grok 4.3 1353, 38.6 points apart on a 0 to 100 scale.
Output price
DeepSeek V4 Flash 0423 $0.28 against Grok 4.3 $2.50 per million output tokens, 8.9x apart.
Context window
DeepSeek V4 Flash 0423 takes 1.05M tokens, Grok 4.3 1M.

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 0423BarsGrok 4.3Ties
Coding62
Intelligence01
Agentic work10
Reasoning30
Math20
Knowledge40
Web design53
General172
All shared boards388
CodingLike-for-likeSix of these boards feed the Vibe Coding Index62
Coding benchmarks for DeepSeek V4 Flash 0423 and Grok 4.3
BenchmarkDeepSeek V4 Flash 0423Grok 4.3Leader
LMArena WebDev15821358DeepSeek V4 Flash 0423
AA Coding Index52.042.2DeepSeek V4 Flash 0423
LiveCodeBench (Vals AI)Not measured84.5%Only Grok 4.3 measured
SWE-bench Verified (Vals AI)Not measured71.4%Only Grok 4.3 measured
Vibe Code Bench (Vals AI)Not measured19.4%Only Grok 4.3 measured
Code migration (Vals AI)Not measured6.8%Only Grok 4.3 measured
ProgramBench (Vals AI)Not measured0.0%Only Grok 4.3 measured
Terminal-Bench 2.1 (Vals AI)Not measured42.0%Only Grok 4.3 measured
SkillsBench (Vals AI)Not measured40.6%Only Grok 4.3 measured
SciCodeNot measured48.3%Only Grok 4.3 measured
Terminal-Bench Hard (Artificial Analysis run)Not measured37.9%Only Grok 4.3 measured
WeirdML45.6%49.9%Grok 4.3
ALE-Bench678.2944.2Grok 4.3
LMArena Text: coding14571415DeepSeek V4 Flash 0423
LMArena Text: software and IT14531416DeepSeek V4 Flash 0423
LMArena WebDev: React15851353DeepSeek V4 Flash 0423
LMArena WebDev: HTML15581367DeepSeek V4 Flash 0423
LMArena WebDev: from an imageNot measured1375Only Grok 4.3 measured
Neither model has a result on the other 21 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index01
Intelligence benchmarks for DeepSeek V4 Flash 0423 and Grok 4.3
BenchmarkDeepSeek V4 Flash 0423Grok 4.3Leader
AA Intelligence Index24.424.9Grok 4.3
Epoch Capabilities Index146.1Not measuredOnly DeepSeek V4 Flash 0423 measured
Agentic workLike-for-likePublic boards, shown as published, kept out of the index10
Agentic work benchmarks for DeepSeek V4 Flash 0423 and Grok 4.3
BenchmarkDeepSeek V4 Flash 0423Grok 4.3Leader
AA Agentic Index26.315.5DeepSeek V4 Flash 0423
Design Arena: agents building web appsNot measured1126Only Grok 4.3 measured
Design Arena: agents building full-stack appsNot measured1006Only Grok 4.3 measured
Design Arena: agents building mobile appsNot measured1058Only Grok 4.3 measured
Design Arena: agents building Android appsNot measured962Only Grok 4.3 measured
Design Arena: agents building Godot gamesNot measured914Only Grok 4.3 measured
Design Arena: agents building gamesNot measured1007Only Grok 4.3 measured
Design Arena: HTML slidesNot measured959Only Grok 4.3 measured
Design Arena: PowerPoint slidesNot measured988Only Grok 4.3 measured
Design Arena: spreadsheetsNot measured879Only Grok 4.3 measured
Finance Agent (Vals AI)Not measured37.7%Only Grok 4.3 measured
Tax Agent Bench (Vals AI)Not measured6.2%Only Grok 4.3 measured
Legal Research Bench (Vals AI)Not measured15.4%Only Grok 4.3 measured
Excel Modeling Benchmark (Vals AI)Not measured18.4%Only Grok 4.3 measured
τ²-Bench TelecomNot measured97.7%Only Grok 4.3 measured
Vending-Bench 2Not measured$35Only Grok 4.3 measured
LMArena SearchNot measured1166Only Grok 4.3 measured
Neither model has a result on the other 24 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index30
Reasoning benchmarks for DeepSeek V4 Flash 0423 and Grok 4.3
BenchmarkDeepSeek V4 Flash 0423Grok 4.3Leader
GPQA DiamondNot measured91.4%Only Grok 4.3 measured
MMMU Pro (Vals AI)Not measured83.1%Only Grok 4.3 measured
GPQA Diamond (Artificial Analysis run)Not measured90.1%Only Grok 4.3 measured
Humanity's Last Exam (Artificial Analysis run)Not measured37.2%Only Grok 4.3 measured
GPQA Diamond (Epoch AI run)Not measured88.8%Only Grok 4.3 measured
SimpleBench46.3%Not measuredOnly DeepSeek V4 Flash 0423 measured
Chess puzzlesNot measured18.0%Only Grok 4.3 measured
LMArena Text: hard prompts14441396DeepSeek V4 Flash 0423
LMArena Text: expert14411384DeepSeek V4 Flash 0423
LMArena Text: hard prompts in English14491402DeepSeek V4 Flash 0423
LMArena Vision: diagramsNot measured1241Only Grok 4.3 measured
LMArena Vision: homeworkNot measured1241Only Grok 4.3 measured
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 Grok 4.3
BenchmarkDeepSeek V4 Flash 0423Grok 4.3Leader
OTIS Mock AIMENot measured93.3%Only Grok 4.3 measured
FrontierMath, tiers 1 to 3Not measured42.8%Only Grok 4.3 measured
FrontierMath, tier 4Not measured14.6%Only Grok 4.3 measured
ProofBenchNot measured11.0%Only Grok 4.3 measured
LMArena Text: math14261387DeepSeek V4 Flash 0423
LMArena Text: mathematical work14321396DeepSeek V4 Flash 0423
Neither model has a result on the other 7 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index40
Knowledge benchmarks for DeepSeek V4 Flash 0423 and Grok 4.3
BenchmarkDeepSeek V4 Flash 0423Grok 4.3Leader
MMLU ProNot measured85.8%Only Grok 4.3 measured
LegalBench (Vals AI)Not measured84.5%Only Grok 4.3 measured
CaseLaw (Vals AI)Not measured79.3%Only Grok 4.3 measured
CorpFin (Vals AI)Not measured68.5%Only Grok 4.3 measured
TaxEval (Vals AI)Not measured70.8%Only Grok 4.3 measured
MortgageTax (Vals AI)Not measured48.3%Only Grok 4.3 measured
MedCode (Vals AI)Not measured38.1%Only Grok 4.3 measured
SimpleQA VerifiedNot measured33.2%Only Grok 4.3 measured
LMArena Text: science14461399DeepSeek V4 Flash 0423
LMArena Text: medicine and healthcare14481384DeepSeek V4 Flash 0423
LMArena Text: legal and government14391386DeepSeek V4 Flash 0423
LMArena Text: business and finance14251381DeepSeek V4 Flash 0423
Neither model has a result on the other 6 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index53
Web design benchmarks for DeepSeek V4 Flash 0423 and Grok 4.3
BenchmarkDeepSeek V4 Flash 0423Grok 4.3Leader
Design Arena: websites12071196DeepSeek V4 Flash 0423
Design Arena: UI components11621190Grok 4.3
Design Arena: game dev11961173DeepSeek V4 Flash 0423
Design Arena: data viz11271179Grok 4.3
Design Arena: 3D11881124DeepSeek V4 Flash 0423
Design Arena: all code categories12051186DeepSeek V4 Flash 0423
Design Arena: SVG11551080DeepSeek V4 Flash 0423
Design Arena: ASCII art11091125Grok 4.3
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 Grok 4.3
BenchmarkDeepSeek V4 Flash 0423Grok 4.3Leader
Public Benefits Bench (Vals AI)Not measured51.7%Only Grok 4.3 measured
SAGE (Vals AI)Not measured19.7%Only Grok 4.3 measured
MedScribe (Vals AI)Not measured74.4%Only Grok 4.3 measured
Vals Multimodal IndexNot measured43.3%Only Grok 4.3 measured
IFBenchNot measured83.3%Only Grok 4.3 measured
Long context reasoning (AA-LCR)Not measured75.0%Only Grok 4.3 measured
DTBench86.4%90.7%Grok 4.3
LMCA35.9%38.3%Grok 4.3
LMArena Text14321397DeepSeek V4 Flash 0423
LMArena Text: instruction following14211366DeepSeek V4 Flash 0423
LMArena Text: creative writing14031380DeepSeek V4 Flash 0423
LMArena VisionNot measured1229Only Grok 4.3 measured
LMArena Text: English14411404DeepSeek V4 Flash 0423
LMArena Text: non-English14191385DeepSeek V4 Flash 0423
LMArena Text: Chinese14631422DeepSeek V4 Flash 0423
LMArena Text: German14191395DeepSeek V4 Flash 0423
LMArena Text: Japanese13891379DeepSeek V4 Flash 0423
LMArena Text: Korean13831354DeepSeek V4 Flash 0423
LMArena Text: French14391411DeepSeek V4 Flash 0423
LMArena Text: Spanish14361399DeepSeek V4 Flash 0423
LMArena Text: Russian14271399DeepSeek V4 Flash 0423
LMArena Text: Polish14361398DeepSeek V4 Flash 0423
LMArena Text: multi-turn14491406DeepSeek V4 Flash 0423
LMArena Text: longer queries14341393DeepSeek V4 Flash 0423
LMArena Text: writing and language14101385DeepSeek V4 Flash 0423
LMArena Text: entertainment and media14001370DeepSeek V4 Flash 0423
LMArena Vision: EnglishNot measured1235Only Grok 4.3 measured
LMArena Vision: ChineseNot measured1257Only Grok 4.3 measured
LMArena Vision: reading textNot measured1235Only Grok 4.3 measured
LMArena Vision: humorNot measured1222Only Grok 4.3 measured
LMArena Vision: recognizing thingsNot measured1217Only Grok 4.3 measured
LMArena Vision: creative writingNot measured1237Only Grok 4.3 measured
Neither model has a result on the other 14 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 Grok 4.3
BenchmarkDeepSeek V4 Flash 0423Grok 4.3Leader
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
Grok 4.3$0.0025Fits 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
Grok 4.3$0.070Fits 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
Grok 4.3$0.275Fits 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 Grok 4.3
SpecificationDeepSeek V4 Flash 0423SpaceXAI Grok 4.3
MakerDeepSeekxAI
WeightsOpen weightsNo public weights listed
ReleasedApril 24, 2026April 30, 2026
Context window1.05M1M
Input $/Mtok$0.14$1.25
Output $/Mtok$0.28$2.50
Coding indexNot benchmarked37.4
Independent measurements behind it13
Cost per solved taskNot computable$0.31
SourceOpenRouter listingOpenRouter listing

Questions

Is DeepSeek V4 Flash 0423 better than Grok 4.3 for coding?

Only Grok 4.3 has a coding score, 37.4 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 8.9x cheaper ($0.28 vs $2.50 per million) and a larger context window (1.05M against 1M tokens).

Which is cheaper, DeepSeek V4 Flash 0423 or Grok 4.3?

DeepSeek V4 Flash 0423 costs $0.14 per million input tokens and $0.28 per million output tokens; Grok 4.3 costs $1.25 and $2.50. Cost per solved task is known for Grok 4.3 only.

Which has the bigger context window, DeepSeek V4 Flash 0423 or Grok 4.3?

DeepSeek V4 Flash 0423, with 1.05M tokens against 1M.

How many benchmarks is the DeepSeek V4 Flash 0423 vs Grok 4.3 comparison based on?

46 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 Grok 4.3's on 3. Where only one model has a result, the page says so instead of naming a winner.

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