DeepSeek V4 Flash 0731 vs Grok 4.3

DeepSeek V4 Flash 0731 leads Grok 4.3 on coding, 51.8 to 37.4 on the Vibe Coding Index, and DeepSeek V4 Flash 0731 costs 8.9x less per output token ($0.28 vs $2.50 per million). Updated October 21, 2026; 44 benchmarks have a result for both.

Replace DeepSeek V4 Flash 0731 Replace Grok 4.3

DeepSeek V4 Flash 0731DeepSeek

Coding: 51.8
Overall: 55.2
Output $/M: $0.28

Grok 4.3xAI

Coding: 37.4
Overall: 53.1
Output $/M: $2.50

vs boards won of 44 shared, 1 tied

DeepSeek V4 Flash 0731 or Grok 4.3: which to pick

Pick DeepSeek V4 Flash 0731 for coding: it scores 51.8 on the Vibe Coding Index against 37.4 for Grok 4.3.

Pick Grok 4.3 for work measured by GPQA Diamond or LegalBench (Vals AI), where it leads.

Model ADeepSeek V4 Flash 0731DeepSeek51.8/1004 independent benchmarks$0.01 per solved task Model BGrok 4.3xAI37.4/1003 independent benchmarks$0.31 per solved task

441160

Shared results: 44
DeepSeek V4 Flash 0731 only: 11
Grok 4.3 only: 60
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.

Coding
Vibe Coding Index, six public coding benchmarks
DeepSeek V4 Flash 0731
DeepSeek V4 Flash 0731 scores 51.8 against 37.4.
4 and 3 benchmarks behind the scores
Intelligence
AA Intelligence Index
DeepSeek V4 Flash 0731
DeepSeek V4 Flash 0731 leads, 34.3 against 24.9.
Same board, both measured
Agentic work
AA Agentic Index
DeepSeek V4 Flash 0731
DeepSeek V4 Flash 0731 leads, 41.0 against 15.5.
Same board, both measured
Reasoning
GPQA Diamond
Grok 4.3
Grok 4.3 leads, 91.4% against 89.9%.
Same board, both measured
Knowledge
MMLU Pro
DeepSeek V4 Flash 0731
DeepSeek V4 Flash 0731 leads, 86.2% against 85.8%.
Same board, both measured
Web design
Design Arena: websites
DeepSeek V4 Flash 0731
DeepSeek V4 Flash 0731 leads, 1238 against 1196.
Same board, both measured
Long documents
Listed context window
DeepSeek V4 Flash 0731
DeepSeek V4 Flash 0731 takes 1.05M tokens against 1M.
Listed by OpenRouter
Everyday cost
1K input + 500 output tokens
DeepSeek V4 Flash 0731
DeepSeek V4 Flash 0731 $0.0003, Grok 4.3 $0.0025 per turn.
List prices
Cost per solved task
One SWE-bench Verified task, solved
DeepSeek V4 Flash 0731
DeepSeek V4 Flash 0731 $0.01, Grok 4.3 $0.31.
Published attempt cost and pass rate

At a glance

Coding index: DeepSeek V4 Flash 0731 51.8 from 4 benchmarks, Grok 4.3 37.4 from 3 benchmarks.
Widest category: Agentic work, 22.5 points apart on average over 5 shared benchmarks.
Widest single gap: Vibe Code Bench (Vals AI): DeepSeek V4 Flash 0731 74.7% against Grok 4.3 19.4%, 55.3 points apart on a 0 to 100 scale.
Output price: DeepSeek V4 Flash 0731 $0.28 against Grok 4.3 $2.50 per million output tokens, 8.9x apart.
Context window: DeepSeek V4 Flash 0731 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
Category	DeepSeek V4 Flash 0731	Grok 4.3	Ties
Coding	10	0	1 tie
Intelligence	1	0
Agentic work	5	0
Reasoning	4	1
Math	4	0
Knowledge	3	3
Web design	7	1
General	4	0
All shared boards	38	5	1 tie

CodingLike-for-likeSix of these boards feed the Vibe Coding Index100

Coding benchmarks for DeepSeek V4 Flash 0731 and Grok 4.3
Benchmark	DeepSeek V4 Flash 0731	Grok 4.3	Leader
LMArena WebDev	Not measured	1358	Only Grok 4.3 measured
AA Coding Index	69.1	42.2	DeepSeek V4 Flash 0731
LiveCodeBench (Vals AI)	87.3%	84.5%	DeepSeek V4 Flash 0731
SWE-bench Verified (Vals AI)	88.8%	71.4%	DeepSeek V4 Flash 0731
Terminal-Bench 4 (Vals AI)	18.7%	Not measured	Only DeepSeek V4 Flash 0731 measured
Vibe Code Bench (Vals AI)	74.7%	19.4%	DeepSeek V4 Flash 0731
Code migration (Vals AI)	38.6%	6.8%	DeepSeek V4 Flash 0731
ProgramBench (Vals AI)	0.0%	0.0%	Tie
IOI (Vals AI)	32.7%	Not measured	Only DeepSeek V4 Flash 0731 measured
Terminal-Bench 2.1 (Vals AI)	67.0%	42.0%	DeepSeek V4 Flash 0731
SkillsBench (Vals AI)	50.7%	40.6%	DeepSeek V4 Flash 0731
CyberBench (Vals AI)	72.1%	Not measured	Only DeepSeek V4 Flash 0731 measured
SciCode	50.3%	48.3%	DeepSeek V4 Flash 0731
Terminal-Bench Hard (Artificial Analysis run)	Not measured	37.9%	Only Grok 4.3 measured
FrontierCode	18.8%	Not measured	Only DeepSeek V4 Flash 0731 measured
WeirdML	63.0%	49.9%	DeepSeek V4 Flash 0731
ALE-Bench	1306.1	944.2	DeepSeek V4 Flash 0731
LMArena Text: coding	Not measured	1415	Only Grok 4.3 measured
LMArena Text: software and IT	Not measured	1416	Only Grok 4.3 measured
LMArena WebDev: React	Not measured	1353	Only Grok 4.3 measured
LMArena WebDev: HTML	Not measured	1367	Only Grok 4.3 measured
LMArena WebDev: from an image	Not measured	1375	Only Grok 4.3 measured
Neither model has a result on the other 17 boards here

IntelligenceLike-for-likePublic boards, shown as published, kept out of the index10

Intelligence benchmarks for DeepSeek V4 Flash 0731 and Grok 4.3
Benchmark	DeepSeek V4 Flash 0731	Grok 4.3	Leader
AA Intelligence Index	34.3	24.9	DeepSeek V4 Flash 0731
Epoch Capabilities Index	154.8	Not measured	Only DeepSeek V4 Flash 0731 measured

Agentic workLike-for-likePublic boards, shown as published, kept out of the index50

Agentic work benchmarks for DeepSeek V4 Flash 0731 and Grok 4.3
Benchmark	DeepSeek V4 Flash 0731	Grok 4.3	Leader
AA Agentic Index	41.0	15.5	DeepSeek V4 Flash 0731
Design Arena: agents building web apps	Not measured	1126	Only Grok 4.3 measured
Design Arena: agents building full-stack apps	Not measured	1006	Only Grok 4.3 measured
Design Arena: agents building mobile apps	Not measured	1059	Only Grok 4.3 measured
Design Arena: agents building Android apps	Not measured	961	Only Grok 4.3 measured
Design Arena: agents building Godot games	Not measured	914	Only Grok 4.3 measured
Design Arena: agents building games	Not measured	1007	Only Grok 4.3 measured
Design Arena: HTML slides	Not measured	1008	Only Grok 4.3 measured
Design Arena: PowerPoint slides	Not measured	1013	Only Grok 4.3 measured
Finance Agent (Vals AI)	49.5%	37.7%	DeepSeek V4 Flash 0731
Tax Agent Bench (Vals AI)	28.1%	6.2%	DeepSeek V4 Flash 0731
Legal Research Bench (Vals AI)	30.3%	15.4%	DeepSeek V4 Flash 0731
Excel Modeling Benchmark (Vals AI)	57.0%	18.4%	DeepSeek V4 Flash 0731
BioMysteryBench (Vals AI)	64.4%	Not measured	Only DeepSeek V4 Flash 0731 measured
Terminal-Bench-Science (Vals AI)	4.3%	Not measured	Only DeepSeek V4 Flash 0731 measured
τ²-Bench Telecom	Not measured	97.7%	Only Grok 4.3 measured
Vending-Bench 2	Not measured	$35	Only Grok 4.3 measured
LMArena Search	Not measured	1166	Only Grok 4.3 measured
Neither model has a result on the other 23 boards here

ReasoningLike-for-likePublic boards, shown as published, kept out of the index41

Reasoning benchmarks for DeepSeek V4 Flash 0731 and Grok 4.3
Benchmark	DeepSeek V4 Flash 0731	Grok 4.3	Leader
GPQA Diamond	89.9%	91.4%	Grok 4.3
MMMU Pro (Vals AI)	Not measured	83.1%	Only Grok 4.3 measured
GPQA Diamond (Artificial Analysis run)	90.8%	90.1%	DeepSeek V4 Flash 0731
Humanity's Last Exam (Artificial Analysis run)	38.6%	37.2%	DeepSeek V4 Flash 0731
GPQA Diamond (Epoch AI run)	91.0%	88.8%	DeepSeek V4 Flash 0731
ARC-AGI	89.0%	Not measured	Only DeepSeek V4 Flash 0731 measured
ARC-AGI-2	61.4%	Not measured	Only DeepSeek V4 Flash 0731 measured
SimpleBench	61.1%	Not measured	Only DeepSeek V4 Flash 0731 measured
Chess puzzles	32.0%	18.0%	DeepSeek V4 Flash 0731
Mystery game puzzles	34.0%	Not measured	Only DeepSeek V4 Flash 0731 measured
LMArena Text: hard prompts	Not measured	1396	Only Grok 4.3 measured
LMArena Text: expert	Not measured	1384	Only Grok 4.3 measured
LMArena Text: hard prompts in English	Not measured	1402	Only Grok 4.3 measured
LMArena Vision: diagrams	Not measured	1241	Only Grok 4.3 measured
LMArena Vision: homework	Not measured	1241	Only Grok 4.3 measured
Neither model has a result on the other 7 boards here

MathLike-for-likePublic boards, shown as published, kept out of the index40

Math benchmarks for DeepSeek V4 Flash 0731 and Grok 4.3
Benchmark	DeepSeek V4 Flash 0731	Grok 4.3	Leader
OTIS Mock AIME	94.4%	93.3%	DeepSeek V4 Flash 0731
FrontierMath, tiers 1 to 3	57.5%	42.8%	DeepSeek V4 Flash 0731
FrontierMath, tier 4	24.4%	14.6%	DeepSeek V4 Flash 0731
ProofBench	56.0%	11.0%	DeepSeek V4 Flash 0731
LMArena Text: math	Not measured	1387	Only Grok 4.3 measured
LMArena Text: mathematical work	Not measured	1396	Only Grok 4.3 measured
Neither model has a result on the other 7 boards here

KnowledgeLike-for-likePublic boards, shown as published, kept out of the index33

Knowledge benchmarks for DeepSeek V4 Flash 0731 and Grok 4.3
Benchmark	DeepSeek V4 Flash 0731	Grok 4.3	Leader
MMLU Pro	86.2%	85.8%	DeepSeek V4 Flash 0731
LegalBench (Vals AI)	77.7%	84.5%	Grok 4.3
CaseLaw (Vals AI)	Not measured	79.3%	Only Grok 4.3 measured
CorpFin (Vals AI)	61.9%	68.5%	Grok 4.3
TaxEval (Vals AI)	70.7%	70.8%	Grok 4.3
MortgageTax (Vals AI)	Not measured	48.3%	Only Grok 4.3 measured
MedCode (Vals AI)	41.4%	38.1%	DeepSeek V4 Flash 0731
SimpleQA Verified	33.6%	33.2%	DeepSeek V4 Flash 0731
LMArena Text: science	Not measured	1399	Only Grok 4.3 measured
LMArena Text: medicine and healthcare	Not measured	1384	Only Grok 4.3 measured
LMArena Text: legal and government	Not measured	1386	Only Grok 4.3 measured
LMArena Text: business and finance	Not measured	1381	Only Grok 4.3 measured
Neither model has a result on the other 6 boards here

Web designLike-for-likePublic boards, shown as published, kept out of the index71

Web design benchmarks for DeepSeek V4 Flash 0731 and Grok 4.3
Benchmark	DeepSeek V4 Flash 0731	Grok 4.3	Leader
Design Arena: websites	1238	1196	DeepSeek V4 Flash 0731
Design Arena: UI components	1235	1192	DeepSeek V4 Flash 0731
Design Arena: game dev	1208	1174	DeepSeek V4 Flash 0731
Design Arena: data viz	1180	1179	DeepSeek V4 Flash 0731
Design Arena: 3D	1209	1125	DeepSeek V4 Flash 0731
Design Arena: all code categories	1230	1187	DeepSeek V4 Flash 0731
Design Arena: SVG	1185	1081	DeepSeek V4 Flash 0731
Design Arena: ASCII art	1090	1125	Grok 4.3
Neither model has a result on the other 1 board here

GeneralLike-for-likePublic boards, shown as published, kept out of the index40

General benchmarks for DeepSeek V4 Flash 0731 and Grok 4.3
Benchmark	DeepSeek V4 Flash 0731	Grok 4.3	Leader
Public Benefits Bench (Vals AI)	Not measured	51.7%	Only Grok 4.3 measured
SAGE (Vals AI)	Not measured	19.7%	Only Grok 4.3 measured
MedScribe (Vals AI)	80.4%	74.4%	DeepSeek V4 Flash 0731
Vals Multimodal Index	Not measured	43.3%	Only Grok 4.3 measured
IFBench	Not measured	83.3%	Only Grok 4.3 measured
Long context reasoning (AA-LCR)	79.7%	75.0%	DeepSeek V4 Flash 0731
DTBench	90.9%	90.7%	DeepSeek V4 Flash 0731
LMCA	41.7%	38.3%	DeepSeek V4 Flash 0731
LMArena Text	Not measured	1397	Only Grok 4.3 measured
LMArena Text: instruction following	Not measured	1366	Only Grok 4.3 measured
LMArena Text: creative writing	Not measured	1380	Only Grok 4.3 measured
LMArena Vision	Not measured	1229	Only Grok 4.3 measured
LMArena Text: English	Not measured	1404	Only Grok 4.3 measured
LMArena Text: non-English	Not measured	1385	Only Grok 4.3 measured
LMArena Text: Chinese	Not measured	1422	Only Grok 4.3 measured
LMArena Text: German	Not measured	1395	Only Grok 4.3 measured
LMArena Text: Japanese	Not measured	1379	Only Grok 4.3 measured
LMArena Text: Korean	Not measured	1354	Only Grok 4.3 measured
LMArena Text: French	Not measured	1411	Only Grok 4.3 measured
LMArena Text: Spanish	Not measured	1399	Only Grok 4.3 measured
LMArena Text: Russian	Not measured	1399	Only Grok 4.3 measured
LMArena Text: Polish	Not measured	1398	Only Grok 4.3 measured
LMArena Text: multi-turn	Not measured	1406	Only Grok 4.3 measured
LMArena Text: longer queries	Not measured	1393	Only Grok 4.3 measured
LMArena Text: writing and language	Not measured	1385	Only Grok 4.3 measured
LMArena Text: entertainment and media	Not measured	1370	Only Grok 4.3 measured
LMArena Vision: English	Not measured	1235	Only Grok 4.3 measured
LMArena Vision: Chinese	Not measured	1257	Only Grok 4.3 measured
LMArena Vision: reading text	Not measured	1235	Only Grok 4.3 measured
LMArena Vision: humor	Not measured	1222	Only Grok 4.3 measured
LMArena Vision: recognizing things	Not measured	1217	Only Grok 4.3 measured
LMArena Vision: creative writing	Not measured	1237	Only 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 0731 and Grok 4.3
Benchmark	DeepSeek V4 Flash 0731	Grok 4.3	Leader
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 0731$0.0003Fits in one request

Grok 4.3$0.0025Fits in one request

DeepSeek V4 Flash 0731 costs less

Repository review

50K input + 3K output tokens

DeepSeek V4 Flash 0731$0.0078Fits in one request

Grok 4.3$0.070Fits in one request

DeepSeek V4 Flash 0731 costs less

Agent loop

200K input + 10K output tokens

DeepSeek V4 Flash 0731$0.031Fits in one request

Grok 4.3$0.275Fits in one request

DeepSeek V4 Flash 0731 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 0731 and Grok 4.3
Specification	DeepSeek V4 Flash 0731	SpaceXAI Grok 4.3
Maker	DeepSeek	xAI
Weights	Open weights	No public weights listed
Released	July 31, 2026	April 30, 2026
Context window	1.05M	1M
Input $/Mtok	$0.14	$1.25
Output $/Mtok	$0.28	$2.50
Coding index	51.8	37.4
Independent measurements behind it	4	3
Cost per solved task	$0.01	$0.31
Source	OpenRouter listing	OpenRouter listing

Questions

Is DeepSeek V4 Flash 0731 better than Grok 4.3 for coding?

Pick DeepSeek V4 Flash 0731 for coding: it scores 51.8 on the Vibe Coding Index against 37.4 for Grok 4.3. Pick Grok 4.3 for work measured by GPQA Diamond or LegalBench (Vals AI), where it leads.

Which is cheaper, DeepSeek V4 Flash 0731 or Grok 4.3?

DeepSeek V4 Flash 0731 costs $0.14 per million input tokens and $0.28 per million output tokens; Grok 4.3 costs $1.25 and $2.50. Per solved SWE-bench Verified task, DeepSeek V4 Flash 0731 costs $0.01 and Grok 4.3 $0.31.

Which has the bigger context window, DeepSeek V4 Flash 0731 or Grok 4.3?

DeepSeek V4 Flash 0731, with 1.05M tokens against 1M.

How many benchmarks is the DeepSeek V4 Flash 0731 vs Grok 4.3 comparison based on?

44 benchmarks have a result for both models as of October 21, 2026. DeepSeek V4 Flash 0731's coding index rests on 4 independent benchmarks 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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DeepSeek V4 Flash 0731 or Grok 4.3: which to pick

Which one for your work

Coding

Intelligence

Agentic work

Reasoning

Knowledge

Web design

Long documents

Everyday cost

Cost per solved task

At a glance

Benchmark by benchmark

What each workload costs

Chat turn

Repository review

Agent loop

Specification differences

Questions

Compare next