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DeepSeek V3.1 Terminus vs Phi 4

Updated October 21, 2026. 30 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 Phi 4
DeepSeek V3.1 TerminusDeepSeek
Coding
No data
Overall
14.8
Output $/M
$1.0142
30
Phi 4Microsoft
Coding
No data
Overall
5.9
Output $/M
$0.14
0
vs boards won of 30 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 the context window is larger, 164K against 16K tokens.

Model ADeepSeek V3.1 TerminusDeepSeekNot benchmarkedNo coding benchmarkNo cost per solved taskModel BPhi 4MicrosoftNot benchmarkedNo coding benchmarkNo cost per solved task
Shared results
30
DeepSeek V3.1 Terminus only
14
Phi 4 only
15
Like-for-like categories
7 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, Phi 4 not benchmarked.
Widest category
Math, 56.5 points apart on average over 3 shared benchmarks.
Widest single gap
AA Math Index: DeepSeek V3.1 Terminus 89.7 against Phi 4 18.0, 71.7 points apart on a 0 to 100 scale.
Output price
DeepSeek V3.1 Terminus $1.0142 against Phi 4 $0.14 per million output tokens, 7.2x apart.
Context window
DeepSeek V3.1 Terminus takes 164K tokens, Phi 4 16K.

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 TerminusBarsPhi 4Ties
Coding40
Intelligence10
Agentic work10
Reasoning40
Math30
Knowledge50
General120
All shared boards300
CodingLike-for-likeSix of these boards feed the Vibe Coding Index40
Coding benchmarks for DeepSeek V3.1 Terminus and Phi 4
BenchmarkDeepSeek V3.1 TerminusPhi 4Leader
AA Coding Index43.5Not measuredOnly DeepSeek V3.1 Terminus measured
LiveCodeBench (Artificial Analysis run)79.8%23.1%DeepSeek V3.1 Terminus
SciCode38.0%Not measuredOnly DeepSeek V3.1 Terminus measured
Terminal-Bench Hard (Artificial Analysis run)31.8%3.8%DeepSeek V3.1 Terminus
ALE-Bench745.2Not measuredOnly DeepSeek V3.1 Terminus measured
LMArena Text: coding14251231DeepSeek V3.1 Terminus
LMArena Text: software and IT14261228DeepSeek V3.1 Terminus
Neither model has a result on the other 31 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index10
Intelligence benchmarks for DeepSeek V3.1 Terminus and Phi 4
BenchmarkDeepSeek V3.1 TerminusPhi 4Leader
AA Intelligence Index14.85.9DeepSeek V3.1 Terminus
Epoch Capabilities IndexNot measured130.5Only Phi 4 measured
Agentic workLike-for-likePublic boards, shown as published, kept out of the index10
Agentic work benchmarks for DeepSeek V3.1 Terminus and Phi 4
BenchmarkDeepSeek V3.1 TerminusPhi 4Leader
AA Agentic Index6.8Not measuredOnly DeepSeek V3.1 Terminus measured
τ²-Bench Telecom37.1%0.0%DeepSeek V3.1 Terminus
BALROGNot measured11.6%Only Phi 4 measured
Neither model has a result on the other 36 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index40
Reasoning benchmarks for DeepSeek V3.1 Terminus and Phi 4
BenchmarkDeepSeek V3.1 TerminusPhi 4Leader
GPQA Diamond (Artificial Analysis run)79.2%57.5%DeepSeek V3.1 Terminus
Humanity's Last Exam (Artificial Analysis run)16.4%3.8%DeepSeek V3.1 Terminus
GPQA Diamond (Epoch AI run)Not measured56.1%Only Phi 4 measured
LMArena Text: hard prompts14261220DeepSeek V3.1 Terminus
LMArena Text: expertNot measured1203Only Phi 4 measured
LMArena Text: hard prompts in English14321230DeepSeek V3.1 Terminus
Neither model has a result on the other 15 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index30
Math benchmarks for DeepSeek V3.1 Terminus and Phi 4
BenchmarkDeepSeek V3.1 TerminusPhi 4Leader
AA Math Index89.718.0DeepSeek V3.1 Terminus
AIME 2025 (Artificial Analysis run)89.7%18.0%DeepSeek V3.1 Terminus
OTIS Mock AIMENot measured13.8%Only Phi 4 measured
MATH level 5Not measured64.9%Only Phi 4 measured
LMArena Text: math14021246DeepSeek V3.1 Terminus
LMArena Text: mathematical workNot measured1254Only Phi 4 measured
Neither model has a result on the other 7 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index50
Knowledge benchmarks for DeepSeek V3.1 Terminus and Phi 4
BenchmarkDeepSeek V3.1 TerminusPhi 4Leader
MMLU Pro (Artificial Analysis run)85.1%71.4%DeepSeek V3.1 Terminus
MMLUNot measured84.8%Only Phi 4 measured
LMArena Text: science14511206DeepSeek V3.1 Terminus
LMArena Text: medicine and healthcare14681202DeepSeek V3.1 Terminus
LMArena Text: legal and government14571241DeepSeek V3.1 Terminus
LMArena Text: business and finance14141199DeepSeek V3.1 Terminus
Neither model has a result on the other 11 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 Phi 4
BenchmarkDeepSeek V3.1 TerminusPhi 4Leader
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 index120
General benchmarks for DeepSeek V3.1 Terminus and Phi 4
BenchmarkDeepSeek V3.1 TerminusPhi 4Leader
IFBench57.0%23.5%DeepSeek V3.1 Terminus
Long context reasoning (AA-LCR)69.3%0.0%DeepSeek V3.1 Terminus
DTBench81.3%Not measuredOnly DeepSeek V3.1 Terminus measured
LMCA28.6%Not measuredOnly DeepSeek V3.1 Terminus measured
Creative writing (Lech Mazur)Not measured62.6%Only Phi 4 measured
LMArena Text14191217DeepSeek V3.1 Terminus
LMArena Text: instruction following14041201DeepSeek V3.1 Terminus
LMArena Text: creative writing14031181DeepSeek V3.1 Terminus
LMArena Text: English14291231DeepSeek V3.1 Terminus
LMArena Text: non-English14081197DeepSeek V3.1 Terminus
LMArena Text: ChineseNot measured1212Only Phi 4 measured
LMArena Text: GermanNot measured1222Only Phi 4 measured
LMArena Text: JapaneseNot measured1158Only Phi 4 measured
LMArena Text: KoreanNot measured1151Only Phi 4 measured
LMArena Text: FrenchNot measured1224Only Phi 4 measured
LMArena Text: SpanishNot measured1234Only Phi 4 measured
LMArena Text: Russian14351209DeepSeek V3.1 Terminus
LMArena Text: Polish1427Not measuredOnly DeepSeek V3.1 Terminus measured
LMArena Text: multi-turn14111206DeepSeek V3.1 Terminus
LMArena Text: longer queries14221217DeepSeek V3.1 Terminus
LMArena Text: writing and language14091198DeepSeek V3.1 Terminus
LMArena Text: entertainment and media13911162DeepSeek V3.1 Terminus
Neither model has a result on the other 24 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 Phi 4
BenchmarkDeepSeek V3.1 TerminusPhi 4Leader
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
Phi 4$0.0001Fits in one request

Phi 4 costs less

Repository review

50K input + 3K output tokens

DeepSeek V3.1 Terminus$0.018Fits in one request
Phi 4$0.0039Exceeds the context window

Phi 4 costs less

Agent loop

200K input + 10K output tokens

DeepSeek V3.1 Terminus$0.071Exceeds the context window
Phi 4$0.015Exceeds the context window

Phi 4 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 Phi 4
SpecificationDeepSeek V3.1 TerminusMicrosoft Phi 4
MakerDeepSeekMicrosoft
WeightsOpen weightsOpen weights
ReleasedSeptember 22, 2025January 10, 2025
Context window164K16K
Input $/Mtok$0.3063$0.07
Output $/Mtok$1.0142$0.14
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 Phi 4 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 the context window is larger, 164K against 16K tokens.

Which is cheaper, DeepSeek V3.1 Terminus or Phi 4?

DeepSeek V3.1 Terminus costs $0.3063 per million input tokens and $1.0142 per million output tokens; Phi 4 costs $0.07 and $0.14. Cost per solved task is known for neither of them.

Which has the bigger context window, DeepSeek V3.1 Terminus or Phi 4?

DeepSeek V3.1 Terminus, with 164K tokens against 16K.

How many benchmarks is the DeepSeek V3.1 Terminus vs Phi 4 comparison based on?

30 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 Phi 4's on 0. Where only one model has a result, the page says so instead of naming a winner.

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