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DeepSeek V3.1 vs DeepSeek V4 Flash 0731

DeepSeek V4 Flash 0731 leads DeepSeek V3.1 on the Artificial Analysis Intelligence Index, 34.3 to 13.7, and DeepSeek V4 Flash 0731 costs 5.4x less per output token ($0.28 vs $1.50 per million). Updated October 21, 2026; 10 benchmarks have a result for both.

Replace DeepSeek V3.1 Replace DeepSeek V4 Flash 0731
DeepSeek V3.1DeepSeek
Coding
No data
Overall
No data
Output $/M
$1.50
0
DeepSeek V4 Flash 0731DeepSeek
Coding
51.8
Overall
55.2
Output $/M
$0.28
10
vs boards won of 10 shared

DeepSeek V3.1 or DeepSeek V4 Flash 0731: which to pick

Only DeepSeek V4 Flash 0731 has a coding score, 51.8 on the Vibe Coding Index; DeepSeek V3.1 has none, so the two cannot be ranked on coding.

Compare them on price, context and the boards below.

Model ADeepSeek V3.1DeepSeekNot benchmarkedNo coding benchmarkNo cost per solved taskModel BDeepSeek V4 Flash 0731DeepSeek51.8/1004 independent benchmarks$0.01 per solved task
Shared results
10
DeepSeek V3.1 only
1
DeepSeek V4 Flash 0731 only
45
Like-for-like categories
3 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 V3.1 not benchmarked, DeepSeek V4 Flash 0731 51.8 from 4 benchmarks.
Widest category
Intelligence, 20.6 points apart on average over 1 shared benchmark.
Widest single gap
Design Arena: SVG: DeepSeek V3.1 967 against DeepSeek V4 Flash 0731 1185, 27.2 points apart on a 0 to 100 scale.
Output price
DeepSeek V3.1 $1.50 against DeepSeek V4 Flash 0731 $0.28 per million output tokens, 5.4x apart.
Context window
DeepSeek V3.1 takes 164K tokens, DeepSeek V4 Flash 0731 1.05M.

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 V3.1BarsDeepSeek V4 Flash 0731Ties
Intelligence01
Web design07
General02
All shared boards010
CodingDirectional onlySix of these boards feed the Vibe Coding Index15 boards, none shared
Coding benchmarks for DeepSeek V3.1 and DeepSeek V4 Flash 0731
BenchmarkDeepSeek V3.1DeepSeek V4 Flash 0731Leader
AA Coding IndexNot measured69.1Only DeepSeek V4 Flash 0731 measured
LiveCodeBench (Vals AI)Not measured87.3%Only DeepSeek V4 Flash 0731 measured
SWE-bench Verified (Vals AI)Not measured88.8%Only DeepSeek V4 Flash 0731 measured
Terminal-Bench 4 (Vals AI)Not measured18.7%Only DeepSeek V4 Flash 0731 measured
Vibe Code Bench (Vals AI)Not measured74.7%Only DeepSeek V4 Flash 0731 measured
Code migration (Vals AI)Not measured38.6%Only DeepSeek V4 Flash 0731 measured
ProgramBench (Vals AI)Not measured0.0%Only DeepSeek V4 Flash 0731 measured
IOI (Vals AI)Not measured32.7%Only DeepSeek V4 Flash 0731 measured
Terminal-Bench 2.1 (Vals AI)Not measured67.0%Only DeepSeek V4 Flash 0731 measured
SkillsBench (Vals AI)Not measured50.7%Only DeepSeek V4 Flash 0731 measured
CyberBench (Vals AI)Not measured72.1%Only DeepSeek V4 Flash 0731 measured
SciCodeNot measured50.3%Only DeepSeek V4 Flash 0731 measured
FrontierCodeNot measured18.8%Only DeepSeek V4 Flash 0731 measured
WeirdMLNot measured63.0%Only DeepSeek V4 Flash 0731 measured
ALE-BenchNot measured1306.1Only DeepSeek V4 Flash 0731 measured
Neither model has a result on the other 24 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index01
Intelligence benchmarks for DeepSeek V3.1 and DeepSeek V4 Flash 0731
BenchmarkDeepSeek V3.1DeepSeek V4 Flash 0731Leader
AA Intelligence Index13.734.3DeepSeek V4 Flash 0731
Epoch Capabilities IndexNot measured154.8Only DeepSeek V4 Flash 0731 measured
Agentic workDirectional onlyPublic boards, shown as published, kept out of the index7 boards, none shared
Agentic work benchmarks for DeepSeek V3.1 and DeepSeek V4 Flash 0731
BenchmarkDeepSeek V3.1DeepSeek V4 Flash 0731Leader
AA Agentic IndexNot measured41.0Only DeepSeek V4 Flash 0731 measured
Finance Agent (Vals AI)Not measured49.5%Only DeepSeek V4 Flash 0731 measured
Tax Agent Bench (Vals AI)Not measured28.1%Only DeepSeek V4 Flash 0731 measured
Legal Research Bench (Vals AI)Not measured30.3%Only DeepSeek V4 Flash 0731 measured
Excel Modeling Benchmark (Vals AI)Not measured57.0%Only DeepSeek V4 Flash 0731 measured
BioMysteryBench (Vals AI)Not measured64.4%Only DeepSeek V4 Flash 0731 measured
Terminal-Bench-Science (Vals AI)Not measured4.3%Only DeepSeek V4 Flash 0731 measured
Neither model has a result on the other 34 boards here
ReasoningDirectional onlyPublic boards, shown as published, kept out of the index10 boards, none shared
Reasoning benchmarks for DeepSeek V3.1 and DeepSeek V4 Flash 0731
BenchmarkDeepSeek V3.1DeepSeek V4 Flash 0731Leader
GPQA DiamondNot measured89.9%Only DeepSeek V4 Flash 0731 measured
GPQA Diamond (Artificial Analysis run)Not measured90.8%Only DeepSeek V4 Flash 0731 measured
Humanity's Last Exam (Artificial Analysis run)Not measured38.6%Only DeepSeek V4 Flash 0731 measured
GPQA Diamond (Epoch AI run)Not measured91.0%Only DeepSeek V4 Flash 0731 measured
ARC-AGINot measured89.0%Only DeepSeek V4 Flash 0731 measured
ARC-AGI-2Not measured61.4%Only DeepSeek V4 Flash 0731 measured
SimpleBenchNot measured61.1%Only DeepSeek V4 Flash 0731 measured
Chess puzzlesNot measured32.0%Only DeepSeek V4 Flash 0731 measured
Mystery game puzzlesNot measured34.0%Only DeepSeek V4 Flash 0731 measured
Kagi LLM Benchmark53.2%Not measuredOnly DeepSeek V3.1 measured
Neither model has a result on the other 12 boards here
MathDirectional onlyPublic boards, shown as published, kept out of the index4 boards, none shared
Math benchmarks for DeepSeek V3.1 and DeepSeek V4 Flash 0731
BenchmarkDeepSeek V3.1DeepSeek V4 Flash 0731Leader
OTIS Mock AIMENot measured94.4%Only DeepSeek V4 Flash 0731 measured
FrontierMath, tiers 1 to 3Not measured57.5%Only DeepSeek V4 Flash 0731 measured
FrontierMath, tier 4Not measured24.4%Only DeepSeek V4 Flash 0731 measured
ProofBenchNot measured56.0%Only DeepSeek V4 Flash 0731 measured
Neither model has a result on the other 9 boards here
KnowledgeDirectional onlyPublic boards, shown as published, kept out of the index6 boards, none shared
Knowledge benchmarks for DeepSeek V3.1 and DeepSeek V4 Flash 0731
BenchmarkDeepSeek V3.1DeepSeek V4 Flash 0731Leader
MMLU ProNot measured86.2%Only DeepSeek V4 Flash 0731 measured
LegalBench (Vals AI)Not measured77.7%Only DeepSeek V4 Flash 0731 measured
CorpFin (Vals AI)Not measured61.9%Only DeepSeek V4 Flash 0731 measured
TaxEval (Vals AI)Not measured70.7%Only DeepSeek V4 Flash 0731 measured
MedCode (Vals AI)Not measured41.4%Only DeepSeek V4 Flash 0731 measured
SimpleQA VerifiedNot measured33.6%Only DeepSeek V4 Flash 0731 measured
Neither model has a result on the other 12 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index07
Web design benchmarks for DeepSeek V3.1 and DeepSeek V4 Flash 0731
BenchmarkDeepSeek V3.1DeepSeek V4 Flash 0731Leader
Design Arena: websites11231238DeepSeek V4 Flash 0731
Design Arena: UI components10851235DeepSeek V4 Flash 0731
Design Arena: game dev10841208DeepSeek V4 Flash 0731
Design Arena: data viz10951180DeepSeek V4 Flash 0731
Design Arena: 3D10771209DeepSeek V4 Flash 0731
Design Arena: all code categories11121230DeepSeek V4 Flash 0731
Design Arena: SVG9671185DeepSeek V4 Flash 0731
Design Arena: ASCII artNot measured1090Only DeepSeek V4 Flash 0731 measured
Neither model has a result on the other 1 board here
GeneralLike-for-likePublic boards, shown as published, kept out of the index02
General benchmarks for DeepSeek V3.1 and DeepSeek V4 Flash 0731
BenchmarkDeepSeek V3.1DeepSeek V4 Flash 0731Leader
MedScribe (Vals AI)Not measured80.4%Only DeepSeek V4 Flash 0731 measured
Long context reasoning (AA-LCR)Not measured79.7%Only DeepSeek V4 Flash 0731 measured
DTBench82.7%90.9%DeepSeek V4 Flash 0731
LMCA24.3%41.7%DeepSeek V4 Flash 0731
Neither model has a result on the other 42 boards here
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
Image generation benchmarks for DeepSeek V3.1 and DeepSeek V4 Flash 0731
BenchmarkDeepSeek V3.1DeepSeek V4 Flash 0731Leader
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 V3.1$0.0013Fits in one request
DeepSeek V4 Flash 0731$0.0003Fits in one request

DeepSeek V4 Flash 0731 costs less

Repository review

50K input + 3K output tokens

DeepSeek V3.1$0.032Fits in one request
DeepSeek V4 Flash 0731$0.0078Fits in one request

DeepSeek V4 Flash 0731 costs less

Agent loop

200K input + 10K output tokens

DeepSeek V3.1$0.125Exceeds the context window
DeepSeek V4 Flash 0731$0.031Fits 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 V3.1 and DeepSeek V4 Flash 0731
SpecificationDeepSeek V3.1DeepSeek V4 Flash 0731
MakerDeepSeekDeepSeek
WeightsOpen weightsOpen weights
ReleasedAugust 21, 2025July 31, 2026
Context window164K1.05M
Input $/Mtok$0.55$0.14
Output $/Mtok$1.50$0.28
Coding indexNot benchmarked51.8
Independent measurements behind it04
Cost per solved taskNot computable$0.01
SourceOpenRouter listingOpenRouter listing

Questions

Is DeepSeek V3.1 better than DeepSeek V4 Flash 0731 for coding?

Only DeepSeek V4 Flash 0731 has a coding score, 51.8 on the Vibe Coding Index; DeepSeek V3.1 has none, so the two cannot be ranked on coding. Compare them on price, context and the boards below.

Which is cheaper, DeepSeek V3.1 or DeepSeek V4 Flash 0731?

DeepSeek V3.1 costs $0.55 per million input tokens and $1.50 per million output tokens; DeepSeek V4 Flash 0731 costs $0.14 and $0.28. Cost per solved task is known for DeepSeek V4 Flash 0731 only.

Which has the bigger context window, DeepSeek V3.1 or DeepSeek V4 Flash 0731?

DeepSeek V4 Flash 0731, with 1.05M tokens against 164K.

How many benchmarks is the DeepSeek V3.1 vs DeepSeek V4 Flash 0731 comparison based on?

10 benchmarks have a result for both models as of October 21, 2026. DeepSeek V3.1's coding index rests on 0 independent benchmarks and DeepSeek V4 Flash 0731's on 4. Where only one model has a result, the page says so instead of naming a winner.

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