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DeepSeek V3.1 Terminus vs DeepSeek V4 Flash 0423

Updated October 21, 2026. 33 benchmarks have a result for both. Coding is ranked on the Vibe Coding Index; every other board is shown as published.

Replace DeepSeek V3.1 Terminus Replace DeepSeek V4 Flash 0423
DeepSeek V3.1 TerminusDeepSeek
Coding
No data
Overall
14.8
Output $/M
$1.0142
8
DeepSeek V4 Flash 0423DeepSeek
Coding
No data
Overall
24.4
Output $/M
$0.28
25
vs boards won of 33 shared

Decision reading

Neither model has a coding score yet, so the two cannot be ranked on coding.

DeepSeek V3.1 Terminus has the edge where what matters is AA Coding Index or LMArena Text: coding, where it leads.

Model ADeepSeek V3.1 TerminusDeepSeekNot benchmarkedNo coding benchmarkNo cost per solved taskModel BDeepSeek V4 Flash 0423DeepSeekNot benchmarked1 independent benchmarkNo cost per solved task
Shared results
33
DeepSeek V3.1 Terminus only
11
DeepSeek V4 Flash 0423 only
15
Like-for-like categories
8 of 9

Shared results can support a head-to-head reading. Results only one model has describe coverage, not superiority.

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 Terminus not benchmarked, DeepSeek V4 Flash 0423 not benchmarked.
Widest category
Agentic work, 19.5 points apart on average over 1 shared benchmark.
Widest single gap
AA Agentic Index: DeepSeek V3.1 Terminus 6.8 against DeepSeek V4 Flash 0423 26.3, 19.5 points apart on a 0 to 100 scale.
Output price
DeepSeek V3.1 Terminus $1.0142 against DeepSeek V4 Flash 0423 $0.28 per million output tokens, 3.6x apart.
Context window
DeepSeek V3.1 Terminus takes 164K tokens, DeepSeek V4 Flash 0423 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 V3.1 TerminusBarsDeepSeek V4 Flash 0423Ties
Coding13
Intelligence01
Agentic work01
Reasoning02
Math01
Knowledge31
Web design25
General211
All shared boards825
CodingLike-for-likeSix of these boards feed the Vibe Coding Index13
Coding benchmarks for DeepSeek V3.1 Terminus and DeepSeek V4 Flash 0423
BenchmarkDeepSeek V3.1 TerminusDeepSeek V4 Flash 0423Leader
LMArena WebDevNot measured1582Only DeepSeek V4 Flash 0423 measured
AA Coding Index43.552.0DeepSeek V4 Flash 0423
LiveCodeBench (Artificial Analysis run)79.8%Not measuredOnly DeepSeek V3.1 Terminus measured
SciCode38.0%Not measuredOnly DeepSeek V3.1 Terminus measured
Terminal-Bench Hard (Artificial Analysis run)31.8%Not measuredOnly DeepSeek V3.1 Terminus measured
WeirdMLNot measured45.6%Only DeepSeek V4 Flash 0423 measured
ALE-Bench745.2678.2DeepSeek V3.1 Terminus
LMArena Text: coding14251457DeepSeek V4 Flash 0423
LMArena Text: software and IT14261453DeepSeek V4 Flash 0423
LMArena WebDev: ReactNot measured1585Only DeepSeek V4 Flash 0423 measured
LMArena WebDev: HTMLNot measured1558Only DeepSeek V4 Flash 0423 measured
Neither model has a result on the other 27 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index01
Intelligence benchmarks for DeepSeek V3.1 Terminus and DeepSeek V4 Flash 0423
BenchmarkDeepSeek V3.1 TerminusDeepSeek V4 Flash 0423Leader
AA Intelligence Index14.824.4DeepSeek V4 Flash 0423
Epoch Capabilities IndexNot measured146.1Only DeepSeek V4 Flash 0423 measured
Agentic workLike-for-likePublic boards, shown as published, kept out of the index01
Agentic work benchmarks for DeepSeek V3.1 Terminus and DeepSeek V4 Flash 0423
BenchmarkDeepSeek V3.1 TerminusDeepSeek V4 Flash 0423Leader
AA Agentic Index6.826.3DeepSeek V4 Flash 0423
τ²-Bench Telecom37.1%Not measuredOnly DeepSeek V3.1 Terminus measured
Neither model has a result on the other 37 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index02
Reasoning benchmarks for DeepSeek V3.1 Terminus and DeepSeek V4 Flash 0423
BenchmarkDeepSeek V3.1 TerminusDeepSeek V4 Flash 0423Leader
GPQA Diamond (Artificial Analysis run)79.2%Not measuredOnly DeepSeek V3.1 Terminus measured
Humanity's Last Exam (Artificial Analysis run)16.4%Not measuredOnly DeepSeek V3.1 Terminus measured
SimpleBenchNot measured46.3%Only DeepSeek V4 Flash 0423 measured
LMArena Text: hard prompts14261444DeepSeek V4 Flash 0423
LMArena Text: expertNot measured1441Only DeepSeek V4 Flash 0423 measured
LMArena Text: hard prompts in English14321449DeepSeek V4 Flash 0423
Neither model has a result on the other 15 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index01
Math benchmarks for DeepSeek V3.1 Terminus and DeepSeek V4 Flash 0423
BenchmarkDeepSeek V3.1 TerminusDeepSeek V4 Flash 0423Leader
AA Math Index89.7Not measuredOnly DeepSeek V3.1 Terminus measured
AIME 2025 (Artificial Analysis run)89.7%Not measuredOnly DeepSeek V3.1 Terminus measured
LMArena Text: math14021426DeepSeek V4 Flash 0423
LMArena Text: mathematical workNot measured1432Only DeepSeek V4 Flash 0423 measured
Neither model has a result on the other 9 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index31
Knowledge benchmarks for DeepSeek V3.1 Terminus and DeepSeek V4 Flash 0423
BenchmarkDeepSeek V3.1 TerminusDeepSeek V4 Flash 0423Leader
MMLU Pro (Artificial Analysis run)85.1%Not measuredOnly DeepSeek V3.1 Terminus measured
LMArena Text: science14511446DeepSeek V3.1 Terminus
LMArena Text: medicine and healthcare14681448DeepSeek V3.1 Terminus
LMArena Text: legal and government14571439DeepSeek V3.1 Terminus
LMArena Text: business and finance14141425DeepSeek V4 Flash 0423
Neither model has a result on the other 12 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index25
Web design benchmarks for DeepSeek V3.1 Terminus and DeepSeek V4 Flash 0423
BenchmarkDeepSeek V3.1 TerminusDeepSeek V4 Flash 0423Leader
Design Arena: websites11871208DeepSeek V4 Flash 0423
Design Arena: UI components11821165DeepSeek V3.1 Terminus
Design Arena: game dev11311197DeepSeek V4 Flash 0423
Design Arena: data viz11671127DeepSeek V3.1 Terminus
Design Arena: 3D11411189DeepSeek V4 Flash 0423
Design Arena: all code categories11751205DeepSeek V4 Flash 0423
Design Arena: SVG10651155DeepSeek V4 Flash 0423
Design Arena: ASCII artNot measured1109Only 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 index211
General benchmarks for DeepSeek V3.1 Terminus and DeepSeek V4 Flash 0423
BenchmarkDeepSeek V3.1 TerminusDeepSeek V4 Flash 0423Leader
IFBench57.0%Not measuredOnly DeepSeek V3.1 Terminus measured
Long context reasoning (AA-LCR)69.3%Not measuredOnly DeepSeek V3.1 Terminus measured
DTBench81.3%86.4%DeepSeek V4 Flash 0423
LMCA28.6%35.9%DeepSeek V4 Flash 0423
LMArena Text14191432DeepSeek V4 Flash 0423
LMArena Text: instruction following14041421DeepSeek V4 Flash 0423
LMArena Text: creative writing14031403DeepSeek V3.1 Terminus
LMArena Text: English14291441DeepSeek V4 Flash 0423
LMArena Text: non-English14081419DeepSeek V4 Flash 0423
LMArena Text: ChineseNot measured1463Only DeepSeek V4 Flash 0423 measured
LMArena Text: GermanNot measured1419Only DeepSeek V4 Flash 0423 measured
LMArena Text: JapaneseNot measured1389Only DeepSeek V4 Flash 0423 measured
LMArena Text: KoreanNot measured1383Only DeepSeek V4 Flash 0423 measured
LMArena Text: FrenchNot measured1439Only DeepSeek V4 Flash 0423 measured
LMArena Text: SpanishNot measured1436Only DeepSeek V4 Flash 0423 measured
LMArena Text: Russian14351427DeepSeek V3.1 Terminus
LMArena Text: Polish14271436DeepSeek V4 Flash 0423
LMArena Text: multi-turn14111449DeepSeek V4 Flash 0423
LMArena Text: longer queries14221434DeepSeek V4 Flash 0423
LMArena Text: writing and language14091410DeepSeek V4 Flash 0423
LMArena Text: entertainment and media13911400DeepSeek V4 Flash 0423
Neither model has a result on the other 25 boards here
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
Image generation benchmarks for DeepSeek V3.1 Terminus and DeepSeek V4 Flash 0423
BenchmarkDeepSeek V3.1 TerminusDeepSeek V4 Flash 0423Leader
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 Terminus$0.0008Fits in one request
DeepSeek V4 Flash 0423$0.0003Fits in one request

DeepSeek V4 Flash 0423 costs less

Repository review

50K input + 3K output tokens

DeepSeek V3.1 Terminus$0.018Fits in one request
DeepSeek V4 Flash 0423$0.0078Fits in one request

DeepSeek V4 Flash 0423 costs less

Agent loop

200K input + 10K output tokens

DeepSeek V3.1 Terminus$0.071Exceeds the context window
DeepSeek V4 Flash 0423$0.031Fits 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 V3.1 Terminus and DeepSeek V4 Flash 0423
SpecificationDeepSeek V3.1 TerminusDeepSeek V4 Flash 0423
MakerDeepSeekDeepSeek
WeightsOpen weightsOpen weights
ReleasedSeptember 22, 2025April 24, 2026
Context window164K1.05M
Input $/Mtok$0.3063$0.14
Output $/Mtok$1.0142$0.28
Coding indexNot benchmarkedNot benchmarked
Independent measurements behind it01
Cost per solved taskNot computableNot computable
SourceOpenRouter listingOpenRouter listing

Questions

Is DeepSeek V3.1 Terminus better than DeepSeek V4 Flash 0423 for coding?

Neither model has a coding score yet, so the two cannot be ranked on coding. DeepSeek V3.1 Terminus has the edge where what matters is AA Coding Index or LMArena Text: coding, where it leads.

Which is cheaper, DeepSeek V3.1 Terminus or DeepSeek V4 Flash 0423?

DeepSeek V3.1 Terminus costs $0.3063 per million input tokens and $1.0142 per million output tokens; DeepSeek V4 Flash 0423 costs $0.14 and $0.28. Cost per solved task is known for neither of them.

Which has the bigger context window, DeepSeek V3.1 Terminus or DeepSeek V4 Flash 0423?

DeepSeek V4 Flash 0423, with 1.05M tokens against 164K.

How many benchmarks is the DeepSeek V3.1 Terminus vs DeepSeek V4 Flash 0423 comparison based on?

33 benchmarks have a result for both models as of October 21, 2026. DeepSeek V3.1 Terminus's coding index rests on 0 independent benchmarks and DeepSeek V4 Flash 0423's on 1. Where only one model has a result, the page says so instead of naming a winner.

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