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DeepSeek V3.1 Terminus vs o4 Mini

Updated October 21, 2026. 39 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 o4 Mini
DeepSeek V3.1 TerminusDeepSeek
Coding
No data
Overall
14.8
Output $/M
$1.0142
32
o4 MiniOpenAI
Coding
No data
Overall
16.7
Output $/M
$4.40
7
vs boards won of 39 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 output tokens cost 4.3x less, and where what matters is LiveCodeBench (Artificial Analysis run) or AA Intelligence Index, where it leads.

Model ADeepSeek V3.1 TerminusDeepSeekNot benchmarkedNo coding benchmarkNo cost per solved taskModel Bo4 MiniOpenAINot benchmarkedNo coding benchmarkNo cost per solved task
Shared results
39
DeepSeek V3.1 Terminus only
5
o4 Mini only
55
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, o4 Mini not benchmarked.
Widest category
Web design, 24.8 points apart on average over 6 shared benchmarks.
Widest single gap
Design Arena: 3D: DeepSeek V3.1 Terminus 1141 against o4 Mini 854, 35.9 points apart on a 0 to 100 scale.
Output price
DeepSeek V3.1 Terminus $1.0142 against o4 Mini $4.40 per million output tokens, 4.3x apart.
Context window
DeepSeek V3.1 Terminus takes 164K tokens, o4 Mini 200K.

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 TerminusBarso4 MiniTies
Coding31
Intelligence01
Agentic work01
Reasoning31
Math12
Knowledge50
Web design60
General141
All shared boards327
CodingLike-for-likeSix of these boards feed the Vibe Coding Index31
Coding benchmarks for DeepSeek V3.1 Terminus and o4 Mini
BenchmarkDeepSeek V3.1 Terminuso4 MiniLeader
Aider polyglotNot measured72.0%Only o4 Mini measured
SWE-bench VerifiedNot measured64.6%Only o4 Mini measured
SWE-bench MultimodalNot measured33.9%Only o4 Mini measured
AA Coding Index43.5Not measuredOnly DeepSeek V3.1 Terminus measured
LiveCodeBench (Vals AI)Not measured82.2%Only o4 Mini measured
LiveCodeBench (Artificial Analysis run)79.8%85.9%o4 Mini
SciCode38.0%Not measuredOnly DeepSeek V3.1 Terminus measured
Terminal-Bench Hard (Artificial Analysis run)31.8%15.2%DeepSeek V3.1 Terminus
GSO-BenchNot measured3.6%Only o4 Mini measured
WeirdMLNot measured52.6%Only o4 Mini measured
ALE-Bench745.2Not measuredOnly DeepSeek V3.1 Terminus measured
LMArena Text: coding14251368DeepSeek V3.1 Terminus
LMArena Text: software and IT14261367DeepSeek V3.1 Terminus
Neither model has a result on the other 25 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index01
Intelligence benchmarks for DeepSeek V3.1 Terminus and o4 Mini
BenchmarkDeepSeek V3.1 Terminuso4 MiniLeader
AA Intelligence Index14.816.7o4 Mini
Epoch Capabilities IndexNot measured145.5Only o4 Mini measured
Agentic workLike-for-likePublic boards, shown as published, kept out of the index01
Agentic work benchmarks for DeepSeek V3.1 Terminus and o4 Mini
BenchmarkDeepSeek V3.1 Terminuso4 MiniLeader
AA Agentic Index6.8Not measuredOnly DeepSeek V3.1 Terminus measured
τ²-Bench Telecom37.1%55.6%o4 Mini
METR time horizonsNot measured63.9%Only o4 Mini measured
Neither model has a result on the other 36 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index31
Reasoning benchmarks for DeepSeek V3.1 Terminus and o4 Mini
BenchmarkDeepSeek V3.1 Terminuso4 MiniLeader
GPQA DiamondNot measured74.5%Only o4 Mini measured
MMMU Pro (Vals AI)Not measured79.7%Only o4 Mini measured
GPQA Diamond (Artificial Analysis run)79.2%78.4%DeepSeek V3.1 Terminus
Humanity's Last Exam (Artificial Analysis run)16.4%16.5%o4 Mini
GPQA Diamond (Epoch AI run)Not measured79.6%Only o4 Mini measured
ARC-AGINot measured58.7%Only o4 Mini measured
ARC-AGI-2Not measured6.1%Only o4 Mini measured
SimpleBenchNot measured38.7%Only o4 Mini measured
Chess puzzlesNot measured22.0%Only o4 Mini measured
Mystery game puzzlesNot measured5.0%Only o4 Mini measured
VPCTNot measured57.5%Only o4 Mini measured
LMArena Text: hard prompts14261351DeepSeek V3.1 Terminus
LMArena Text: expertNot measured1343Only o4 Mini measured
LMArena Text: hard prompts in English14321366DeepSeek V3.1 Terminus
LMArena Vision: diagramsNot measured1197Only o4 Mini measured
LMArena Vision: homeworkNot measured1234Only o4 Mini measured
Neither model has a result on the other 5 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index12
Math benchmarks for DeepSeek V3.1 Terminus and o4 Mini
BenchmarkDeepSeek V3.1 Terminuso4 MiniLeader
AIMENot measured83.7%Only o4 Mini measured
MATH 500 (Vals AI)Not measured94.2%Only o4 Mini measured
MGSM (Vals AI)Not measured93.4%Only o4 Mini measured
AA Math Index89.790.7o4 Mini
AIME 2025 (Artificial Analysis run)89.7%90.7%o4 Mini
OTIS Mock AIMENot measured81.7%Only o4 Mini measured
FrontierMath, tiers 1 to 3Not measured36.1%Only o4 Mini measured
FrontierMath, tier 4Not measured4.9%Only o4 Mini measured
MATH level 5Not measured97.8%Only o4 Mini measured
LMArena Text: math14021389DeepSeek V3.1 Terminus
LMArena Text: mathematical workNot measured1379Only o4 Mini measured
Neither model has a result on the other 2 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index50
Knowledge benchmarks for DeepSeek V3.1 Terminus and o4 Mini
BenchmarkDeepSeek V3.1 Terminuso4 MiniLeader
MMLU ProNot measured80.6%Only o4 Mini measured
LegalBench (Vals AI)Not measured79.2%Only o4 Mini measured
CorpFin (Vals AI)Not measured59.0%Only o4 Mini measured
TaxEval (Vals AI)Not measured74.8%Only o4 Mini measured
MortgageTax (Vals AI)Not measured64.8%Only o4 Mini measured
MedQA (Vals AI)Not measured96.0%Only o4 Mini measured
MedCode (Vals AI)Not measured33.8%Only o4 Mini measured
MMLU Pro (Artificial Analysis run)85.1%83.2%DeepSeek V3.1 Terminus
SimpleQA VerifiedNot measured19.6%Only o4 Mini measured
GeoBenchNot measured64.0%Only o4 Mini measured
LMArena Text: science14511354DeepSeek V3.1 Terminus
LMArena Text: medicine and healthcare14681361DeepSeek V3.1 Terminus
LMArena Text: legal and government14571350DeepSeek V3.1 Terminus
LMArena Text: business and finance14141325DeepSeek V3.1 Terminus
Neither model has a result on the other 3 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index60
Web design benchmarks for DeepSeek V3.1 Terminus and o4 Mini
BenchmarkDeepSeek V3.1 Terminuso4 MiniLeader
Design Arena: websites1187985DeepSeek V3.1 Terminus
Design Arena: UI components1182983DeepSeek V3.1 Terminus
Design Arena: game dev11311003DeepSeek V3.1 Terminus
Design Arena: data viz1167990DeepSeek V3.1 Terminus
Design Arena: 3D1141854DeepSeek V3.1 Terminus
Design Arena: all code categories1175976DeepSeek V3.1 Terminus
Design Arena: SVG1065Not measuredOnly DeepSeek V3.1 Terminus measured
Neither model has a result on the other 2 boards here
GeneralLike-for-likePublic boards, shown as published, kept out of the index141
General benchmarks for DeepSeek V3.1 Terminus and o4 Mini
BenchmarkDeepSeek V3.1 Terminuso4 MiniLeader
SAGE (Vals AI)Not measured41.1%Only o4 Mini measured
MedScribe (Vals AI)Not measured69.1%Only o4 Mini measured
IFBench57.0%68.7%o4 Mini
Long context reasoning (AA-LCR)69.3%61.0%DeepSeek V3.1 Terminus
DTBench81.3%77.6%DeepSeek V3.1 Terminus
LMCA28.6%26.5%DeepSeek V3.1 Terminus
Fiction.LiveBenchNot measured77.8%Only o4 Mini measured
Creative writing (Lech Mazur)Not measured75.0%Only o4 Mini measured
LMArena Text14191353DeepSeek V3.1 Terminus
LMArena Text: instruction following14041320DeepSeek V3.1 Terminus
LMArena Text: creative writing14031294DeepSeek V3.1 Terminus
LMArena VisionNot measured1194Only o4 Mini measured
LMArena Text: English14291367DeepSeek V3.1 Terminus
LMArena Text: non-English14081337DeepSeek V3.1 Terminus
LMArena Text: ChineseNot measured1354Only o4 Mini measured
LMArena Text: GermanNot measured1336Only o4 Mini measured
LMArena Text: JapaneseNot measured1308Only o4 Mini measured
LMArena Text: KoreanNot measured1312Only o4 Mini measured
LMArena Text: FrenchNot measured1364Only o4 Mini measured
LMArena Text: SpanishNot measured1346Only o4 Mini measured
LMArena Text: Russian14351334DeepSeek V3.1 Terminus
LMArena Text: Polish14271358DeepSeek V3.1 Terminus
LMArena Text: multi-turn14111350DeepSeek V3.1 Terminus
LMArena Text: longer queries14221315DeepSeek V3.1 Terminus
LMArena Text: writing and language14091316DeepSeek V3.1 Terminus
LMArena Text: entertainment and media13911308DeepSeek V3.1 Terminus
LMArena Vision: EnglishNot measured1200Only o4 Mini measured
LMArena Vision: ChineseNot measured1218Only o4 Mini measured
LMArena Vision: reading textNot measured1197Only o4 Mini measured
LMArena Vision: humorNot measured1199Only o4 Mini measured
LMArena Vision: captioningNot measured1204Only o4 Mini measured
LMArena Vision: recognizing thingsNot measured1218Only o4 Mini measured
LMArena Vision: creative writingNot measured1166Only o4 Mini measured
Neither model has a result on the other 13 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 o4 Mini
BenchmarkDeepSeek V3.1 Terminuso4 MiniLeader
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
o4 Mini$0.0033Fits in one request

DeepSeek V3.1 Terminus costs less

Repository review

50K input + 3K output tokens

DeepSeek V3.1 Terminus$0.018Fits in one request
o4 Mini$0.068Fits in one request

DeepSeek V3.1 Terminus costs less

Agent loop

200K input + 10K output tokens

DeepSeek V3.1 Terminus$0.071Exceeds the context window
o4 Mini$0.264Exceeds the context window

DeepSeek V3.1 Terminus 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 o4 Mini
SpecificationDeepSeek V3.1 TerminusOpenAI o4 Mini
MakerDeepSeekOpenAI
WeightsOpen weightsNo public weights listed
ReleasedSeptember 22, 2025April 16, 2025
Context window164K200K
Input $/Mtok$0.3063$1.10
Output $/Mtok$1.0142$4.40
Coding indexNot benchmarkedNot benchmarked
Independent measurements behind it00
Cost per solved taskNot computableNot computable
SourceOpenRouter listingOpenRouter listing

Questions

Is DeepSeek V3.1 Terminus better than o4 Mini 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 output tokens cost 4.3x less, and where what matters is LiveCodeBench (Artificial Analysis run) or AA Intelligence Index, where it leads.

Which is cheaper, DeepSeek V3.1 Terminus or o4 Mini?

DeepSeek V3.1 Terminus costs $0.3063 per million input tokens and $1.0142 per million output tokens; o4 Mini costs $1.10 and $4.40. Cost per solved task is known for neither of them.

Which has the bigger context window, DeepSeek V3.1 Terminus or o4 Mini?

o4 Mini, with 200K tokens against 164K.

How many benchmarks is the DeepSeek V3.1 Terminus vs o4 Mini comparison based on?

39 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 o4 Mini's on 0. Where only one model has a result, the page says so instead of naming a winner.

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