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DeepSeek V3.1 Terminus vs o3 Mini

DeepSeek V3.1 Terminus leads o3 Mini on the Artificial Analysis Intelligence Index, 14.8 to 12.5, and DeepSeek V3.1 Terminus costs 4.3x less per output token ($1.0142 vs $4.40 per million). Updated October 21, 2026; 32 benchmarks have a result for both.

Replace DeepSeek V3.1 Terminus Replace o3 Mini
DeepSeek V3.1 TerminusDeepSeek
Coding
No data
Overall
14.8
Output $/M
$1.0142
30
o3 MiniOpenAI
Coding
No data
Overall
12.5
Output $/M
$4.40
2
vs boards won of 32 shared

DeepSeek V3.1 Terminus or o3 Mini: which to pick

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

Pick DeepSeek V3.1 Terminus for output tokens 4.3x cheaper ($1.0142 vs $4.40 per million) and work measured by SciCode or IFBench, where it leads.

Model ADeepSeek V3.1 TerminusDeepSeekNot benchmarkedNo coding benchmarkNo cost per solved taskModel Bo3 MiniOpenAINot benchmarkedNo coding benchmarkNo cost per solved task
Shared results
32
DeepSeek V3.1 Terminus only
12
o3 Mini only
38
Like-for-like categories
7 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 Terminus not benchmarked, o3 Mini not benchmarked.
Widest category
Knowledge, 17.0 points apart on average over 5 shared benchmarks.
Widest single gap
Long context reasoning (AA-LCR): DeepSeek V3.1 Terminus 69.3% against o3 Mini 43.0%, 26.3 points apart on a 0 to 100 scale.
Output price
DeepSeek V3.1 Terminus $1.0142 against o3 Mini $4.40 per million output tokens, 4.3x apart.
Context window
DeepSeek V3.1 Terminus takes 164K tokens, o3 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 TerminusBarso3 MiniTies
Coding41
Intelligence10
Agentic work10
Reasoning40
Math10
Knowledge50
General141
All shared boards302
CodingLike-for-likeSix of these boards feed the Vibe Coding Index41
Coding benchmarks for DeepSeek V3.1 Terminus and o3 Mini
BenchmarkDeepSeek V3.1 Terminuso3 MiniLeader
Aider polyglotNot measured60.4%Only o3 Mini measured
SWE-bench VerifiedNot measured42.4%Only o3 Mini measured
SWE-bench LiteNot measured32.3%Only o3 Mini measured
AA Coding Index43.5Not measuredOnly DeepSeek V3.1 Terminus measured
LiveCodeBench (Vals AI)Not measured71.5%Only o3 Mini measured
LiveCodeBench (Artificial Analysis run)79.8%73.4%DeepSeek V3.1 Terminus
SciCode38.0%42.8%o3 Mini
Terminal-Bench Hard (Artificial Analysis run)31.8%6.8%DeepSeek V3.1 Terminus
GSO-BenchNot measured1.3%Only o3 Mini measured
WeirdMLNot measured43.7%Only o3 Mini measured
CybenchNot measured22.5%Only o3 Mini measured
ALE-Bench745.2Not measuredOnly DeepSeek V3.1 Terminus measured
LMArena Text: coding14251378DeepSeek V3.1 Terminus
LMArena Text: software and IT14261364DeepSeek V3.1 Terminus
Neither model has a result on the other 24 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index10
Intelligence benchmarks for DeepSeek V3.1 Terminus and o3 Mini
BenchmarkDeepSeek V3.1 Terminuso3 MiniLeader
AA Intelligence Index14.812.5DeepSeek V3.1 Terminus
Epoch Capabilities IndexNot measured140.2Only o3 Mini measured
Agentic workLike-for-likePublic boards, shown as published, kept out of the index10
Agentic work benchmarks for DeepSeek V3.1 Terminus and o3 Mini
BenchmarkDeepSeek V3.1 Terminuso3 MiniLeader
AA Agentic Index6.8Not measuredOnly DeepSeek V3.1 Terminus measured
τ²-Bench Telecom37.1%31.3%DeepSeek V3.1 Terminus
Neither model has a result on the other 37 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index40
Reasoning benchmarks for DeepSeek V3.1 Terminus and o3 Mini
BenchmarkDeepSeek V3.1 Terminuso3 MiniLeader
GPQA DiamondNot measured75.5%Only o3 Mini measured
GPQA Diamond (Artificial Analysis run)79.2%77.3%DeepSeek V3.1 Terminus
Humanity's Last Exam (Artificial Analysis run)16.4%12.0%DeepSeek V3.1 Terminus
GPQA Diamond (Epoch AI run)Not measured77.0%Only o3 Mini measured
ARC-AGINot measured34.5%Only o3 Mini measured
ARC-AGI-2Not measured3.0%Only o3 Mini measured
SimpleBenchNot measured22.8%Only o3 Mini measured
Chess puzzlesNot measured15.0%Only o3 Mini measured
Mystery game puzzlesNot measured7.0%Only o3 Mini measured
LMArena Text: hard prompts14261365DeepSeek V3.1 Terminus
LMArena Text: expertNot measured1364Only o3 Mini measured
LMArena Text: hard prompts in English14321375DeepSeek V3.1 Terminus
Neither model has a result on the other 9 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index10
Math benchmarks for DeepSeek V3.1 Terminus and o3 Mini
BenchmarkDeepSeek V3.1 Terminuso3 MiniLeader
AIMENot measured86.5%Only o3 Mini measured
MATH 500 (Vals AI)Not measured91.8%Only o3 Mini measured
MGSM (Vals AI)Not measured91.3%Only o3 Mini measured
AA Math Index89.7Not measuredOnly DeepSeek V3.1 Terminus measured
AIME 2025 (Artificial Analysis run)89.7%Not measuredOnly DeepSeek V3.1 Terminus measured
OTIS Mock AIMENot measured76.9%Only o3 Mini measured
FrontierMath, tiers 1 to 3Not measured18.6%Only o3 Mini measured
FrontierMath, tier 4Not measured0.0%Only o3 Mini measured
MATH level 5Not measured96.5%Only o3 Mini measured
LMArena Text: math14021396DeepSeek V3.1 Terminus
LMArena Text: mathematical workNot measured1399Only o3 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 o3 Mini
BenchmarkDeepSeek V3.1 Terminuso3 MiniLeader
MMLU ProNot measured78.7%Only o3 Mini measured
LegalBench (Vals AI)Not measured71.5%Only o3 Mini measured
CorpFin (Vals AI)Not measured45.3%Only o3 Mini measured
TaxEval (Vals AI)Not measured69.4%Only o3 Mini measured
MedQA (Vals AI)Not measured94.8%Only o3 Mini measured
MMLU Pro (Artificial Analysis run)85.1%80.2%DeepSeek V3.1 Terminus
SimpleQA VerifiedNot measured15.3%Only o3 Mini measured
LMArena Text: science14511339DeepSeek V3.1 Terminus
LMArena Text: medicine and healthcare14681330DeepSeek V3.1 Terminus
LMArena Text: legal and government14571328DeepSeek V3.1 Terminus
LMArena Text: business and finance14141313DeepSeek V3.1 Terminus
Neither model has a result on the other 6 boards here
Web designDirectional onlyPublic boards, shown as published, kept out of the index7 boards, none shared
Web design benchmarks for DeepSeek V3.1 Terminus and o3 Mini
BenchmarkDeepSeek V3.1 Terminuso3 MiniLeader
Design Arena: websites1187Not measuredOnly DeepSeek V3.1 Terminus measured
Design Arena: UI components1182Not measuredOnly DeepSeek V3.1 Terminus measured
Design Arena: game dev1131Not measuredOnly DeepSeek V3.1 Terminus measured
Design Arena: data viz1167Not measuredOnly DeepSeek V3.1 Terminus measured
Design Arena: 3D1141Not measuredOnly DeepSeek V3.1 Terminus measured
Design Arena: all code categories1175Not measuredOnly DeepSeek V3.1 Terminus measured
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 o3 Mini
BenchmarkDeepSeek V3.1 Terminuso3 MiniLeader
IFBench57.0%67.1%o3 Mini
Long context reasoning (AA-LCR)69.3%43.0%DeepSeek V3.1 Terminus
DTBench81.3%68.8%DeepSeek V3.1 Terminus
LMCA28.6%19.0%DeepSeek V3.1 Terminus
Fiction.LiveBenchNot measured50.0%Only o3 Mini measured
Creative writing (Lech Mazur)Not measured61.7%Only o3 Mini measured
LMArena Text14191337DeepSeek V3.1 Terminus
LMArena Text: instruction following14041337DeepSeek V3.1 Terminus
LMArena Text: creative writing14031286DeepSeek V3.1 Terminus
LMArena Text: English14291351DeepSeek V3.1 Terminus
LMArena Text: non-English14081319DeepSeek V3.1 Terminus
LMArena Text: ChineseNot measured1379Only o3 Mini measured
LMArena Text: GermanNot measured1303Only o3 Mini measured
LMArena Text: JapaneseNot measured1286Only o3 Mini measured
LMArena Text: KoreanNot measured1313Only o3 Mini measured
LMArena Text: FrenchNot measured1334Only o3 Mini measured
LMArena Text: SpanishNot measured1321Only o3 Mini measured
LMArena Text: Russian14351304DeepSeek V3.1 Terminus
LMArena Text: Polish14271294DeepSeek V3.1 Terminus
LMArena Text: multi-turn14111320DeepSeek V3.1 Terminus
LMArena Text: longer queries14221343DeepSeek V3.1 Terminus
LMArena Text: writing and language14091313DeepSeek V3.1 Terminus
LMArena Text: entertainment and media13911283DeepSeek V3.1 Terminus
Neither model has a result on the other 23 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 o3 Mini
BenchmarkDeepSeek V3.1 Terminuso3 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
o3 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
o3 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
o3 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 o3 Mini
SpecificationDeepSeek V3.1 TerminusOpenAI o3 Mini
MakerDeepSeekOpenAI
WeightsOpen weightsNo public weights listed
ReleasedSeptember 22, 2025January 31, 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 o3 Mini for coding?

Neither model has a coding score yet, so the two cannot be ranked on coding. Pick DeepSeek V3.1 Terminus for output tokens 4.3x cheaper ($1.0142 vs $4.40 per million) and work measured by SciCode or IFBench, where it leads.

Which is cheaper, DeepSeek V3.1 Terminus or o3 Mini?

DeepSeek V3.1 Terminus costs $0.3063 per million input tokens and $1.0142 per million output tokens; o3 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 o3 Mini?

o3 Mini, with 200K tokens against 164K.

How many benchmarks is the DeepSeek V3.1 Terminus vs o3 Mini comparison based on?

32 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 o3 Mini's on 0. Where only one model has a result, the page says so instead of naming a winner.

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