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DeepSeek V3.1 Terminus vs o3

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 o3
DeepSeek V3.1 TerminusDeepSeek
Coding
No data
Overall
14.8
Output $/M
$1.0142
24
o3OpenAI
Coding
No data
Overall
20.2
Output $/M
$8.00
15
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 7.9x less, and where what matters is LiveCodeBench (Artificial Analysis run) or Terminal-Bench Hard (Artificial Analysis run), where it leads.

Model ADeepSeek V3.1 TerminusDeepSeekNot benchmarkedNo coding benchmarkNo cost per solved taskModel Bo3OpenAINot benchmarkedNo coding benchmark$0.571 per solved task
Shared results
39
DeepSeek V3.1 Terminus only
5
o3 only
58
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, o3 not benchmarked.
Widest category
Agentic work, 43.6 points apart on average over 1 shared benchmark.
Widest single gap
τ²-Bench Telecom: DeepSeek V3.1 Terminus 37.1% against o3 80.7%, 43.6 points apart on a 0 to 100 scale.
Output price
DeepSeek V3.1 Terminus $1.0142 against o3 $8.00 per million output tokens, 7.9x apart.
Context window
DeepSeek V3.1 Terminus takes 164K tokens, o3 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 TerminusBarso3Ties
Coding23
Intelligence01
Agentic work01
Reasoning22
Math21
Knowledge41
Web design41
General105
All shared boards2415
CodingLike-for-likeSix of these boards feed the Vibe Coding Index23
Coding benchmarks for DeepSeek V3.1 Terminus and o3
BenchmarkDeepSeek V3.1 Terminuso3Leader
Aider polyglotNot measured81.3%Only o3 measured
SWE-bench VerifiedNot measured58.4%Only o3 measured
SWE-bench MultimodalNot measured36.0%Only o3 measured
AA Coding Index43.5Not measuredOnly DeepSeek V3.1 Terminus measured
LiveCodeBench (Vals AI)Not measured83.9%Only o3 measured
LiveCodeBench (Artificial Analysis run)79.8%80.8%o3
SciCode38.0%Not measuredOnly DeepSeek V3.1 Terminus measured
Terminal-Bench Hard (Artificial Analysis run)31.8%37.1%o3
GSO-BenchNot measured8.8%Only o3 measured
WeirdMLNot measured52.4%Only o3 measured
ALE-Bench745.2933.5o3
LMArena Text: coding14251407DeepSeek V3.1 Terminus
LMArena Text: software and IT14261415DeepSeek 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 o3
BenchmarkDeepSeek V3.1 Terminuso3Leader
AA Intelligence Index14.820.2o3
Epoch Capabilities IndexNot measured146.7Only o3 measured
Agentic workLike-for-likePublic boards, shown as published, kept out of the index01
Agentic work benchmarks for DeepSeek V3.1 Terminus and o3
BenchmarkDeepSeek V3.1 Terminuso3Leader
AA Agentic Index6.8Not measuredOnly DeepSeek V3.1 Terminus measured
τ²-Bench Telecom37.1%80.7%o3
METR time horizonsNot measured65.4%Only o3 measured
GDPvalNot measured30.8%Only o3 measured
DeepResearch BenchNot measured45.2%Only o3 measured
OSWorldNot measured23.0%Only o3 measured
Neither model has a result on the other 33 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index22
Reasoning benchmarks for DeepSeek V3.1 Terminus and o3
BenchmarkDeepSeek V3.1 Terminuso3Leader
GPQA DiamondNot measured84.1%Only o3 measured
MMMU Pro (Vals AI)Not measured80.4%Only o3 measured
GPQA Diamond (Artificial Analysis run)79.2%82.7%o3
Humanity's Last Exam (Artificial Analysis run)16.4%20.1%o3
GPQA Diamond (Epoch AI run)Not measured81.8%Only o3 measured
ARC-AGINot measured60.8%Only o3 measured
ARC-AGI-2Not measured6.5%Only o3 measured
SimpleBenchNot measured53.1%Only o3 measured
Chess puzzlesNot measured37.0%Only o3 measured
Mystery game puzzlesNot measured29.0%Only o3 measured
VPCTNot measured52.0%Only o3 measured
LMArena Text: hard prompts14261402DeepSeek V3.1 Terminus
LMArena Text: expertNot measured1402Only o3 measured
LMArena Text: hard prompts in English14321411DeepSeek V3.1 Terminus
LMArena Vision: diagramsNot measured1220Only o3 measured
LMArena Vision: homeworkNot measured1234Only o3 measured
Neither model has a result on the other 5 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index21
Math benchmarks for DeepSeek V3.1 Terminus and o3
BenchmarkDeepSeek V3.1 Terminuso3Leader
AIMENot measured85.3%Only o3 measured
MATH 500 (Vals AI)Not measured94.6%Only o3 measured
MGSM (Vals AI)Not measured91.8%Only o3 measured
AA Math Index89.788.3DeepSeek V3.1 Terminus
AIME 2025 (Artificial Analysis run)89.7%88.3%DeepSeek V3.1 Terminus
OTIS Mock AIMENot measured84.4%Only o3 measured
FrontierMath, tiers 1 to 3Not measured33.3%Only o3 measured
MATH level 5Not measured97.8%Only o3 measured
LMArena Text: math14021426o3
LMArena Text: mathematical workNot measured1423Only o3 measured
Neither model has a result on the other 3 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index41
Knowledge benchmarks for DeepSeek V3.1 Terminus and o3
BenchmarkDeepSeek V3.1 Terminuso3Leader
MMLU ProNot measured85.6%Only o3 measured
LegalBench (Vals AI)Not measured83.8%Only o3 measured
CorpFin (Vals AI)Not measured59.7%Only o3 measured
TaxEval (Vals AI)Not measured74.6%Only o3 measured
MortgageTax (Vals AI)Not measured65.7%Only o3 measured
MedQA (Vals AI)Not measured96.1%Only o3 measured
MedCode (Vals AI)Not measured47.3%Only o3 measured
MMLU Pro (Artificial Analysis run)85.1%85.3%o3
SimpleQA VerifiedNot measured49.4%Only o3 measured
GeoBenchNot measured74.0%Only o3 measured
LMArena Text: science14511429DeepSeek V3.1 Terminus
LMArena Text: medicine and healthcare14681448DeepSeek V3.1 Terminus
LMArena Text: legal and government14571428DeepSeek V3.1 Terminus
LMArena Text: business and finance14141393DeepSeek 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 index41
Web design benchmarks for DeepSeek V3.1 Terminus and o3
BenchmarkDeepSeek V3.1 Terminuso3Leader
Design Arena: websites11871036DeepSeek V3.1 Terminus
Design Arena: UI components11821017DeepSeek V3.1 Terminus
Design Arena: game dev11311034DeepSeek V3.1 Terminus
Design Arena: data viz11671200o3
Design Arena: 3D1141Not measuredOnly DeepSeek V3.1 Terminus measured
Design Arena: all code categories11751020DeepSeek 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 index105
General benchmarks for DeepSeek V3.1 Terminus and o3
BenchmarkDeepSeek V3.1 Terminuso3Leader
SAGE (Vals AI)Not measured41.8%Only o3 measured
MedScribe (Vals AI)Not measured76.7%Only o3 measured
IFBench57.0%71.4%o3
Long context reasoning (AA-LCR)69.3%74.7%o3
DTBench81.3%84.8%o3
LMCA28.6%39.7%o3
Fiction.LiveBenchNot measured88.9%Only o3 measured
Creative writing (Lech Mazur)Not measured83.9%Only o3 measured
CL-benchNot measured17.8%Only o3 measured
LMArena Text14191410DeepSeek V3.1 Terminus
LMArena Text: instruction following14041368DeepSeek V3.1 Terminus
LMArena Text: creative writing14031359DeepSeek V3.1 Terminus
LMArena VisionNot measured1214Only o3 measured
LMArena Text: English14291417DeepSeek V3.1 Terminus
LMArena Text: non-English14081401DeepSeek V3.1 Terminus
LMArena Text: ChineseNot measured1437Only o3 measured
LMArena Text: GermanNot measured1420Only o3 measured
LMArena Text: JapaneseNot measured1403Only o3 measured
LMArena Text: KoreanNot measured1370Only o3 measured
LMArena Text: FrenchNot measured1430Only o3 measured
LMArena Text: SpanishNot measured1395Only o3 measured
LMArena Text: Russian14351406DeepSeek V3.1 Terminus
LMArena Text: Polish14271438o3
LMArena Text: multi-turn14111405DeepSeek V3.1 Terminus
LMArena Text: longer queries14221372DeepSeek V3.1 Terminus
LMArena Text: writing and language14091372DeepSeek V3.1 Terminus
LMArena Text: entertainment and media13911373DeepSeek V3.1 Terminus
LMArena Vision: EnglishNot measured1221Only o3 measured
LMArena Vision: ChineseNot measured1237Only o3 measured
LMArena Vision: reading textNot measured1218Only o3 measured
LMArena Vision: humorNot measured1222Only o3 measured
LMArena Vision: captioningNot measured1210Only o3 measured
LMArena Vision: recognizing thingsNot measured1234Only o3 measured
LMArena Vision: creative writingNot measured1201Only o3 measured
Neither model has a result on the other 12 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
BenchmarkDeepSeek V3.1 Terminuso3Leader
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$0.0060Fits 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$0.124Fits 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$0.480Exceeds 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
SpecificationDeepSeek V3.1 TerminusOpenAI o3
MakerDeepSeekOpenAI
WeightsOpen weightsNo public weights listed
ReleasedSeptember 22, 2025April 16, 2025
Context window164K200K
Input $/Mtok$0.3063$2.00
Output $/Mtok$1.0142$8.00
Coding indexNot benchmarkedNot benchmarked
Independent measurements behind it00
Cost per solved taskNot computable$0.571
SourceOpenRouter listingOpenRouter listing

Questions

Is DeepSeek V3.1 Terminus better than o3 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 7.9x less, and where what matters is LiveCodeBench (Artificial Analysis run) or Terminal-Bench Hard (Artificial Analysis run), where it leads.

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

DeepSeek V3.1 Terminus costs $0.3063 per million input tokens and $1.0142 per million output tokens; o3 costs $2.00 and $8.00. Cost per solved task is known for o3 only.

Which has the bigger context window, DeepSeek V3.1 Terminus or o3?

o3, with 200K tokens against 164K.

How many benchmarks is the DeepSeek V3.1 Terminus vs o3 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 o3's on 0. Where only one model has a result, the page says so instead of naming a winner.

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