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DeepSeek V3.1 Terminus vs GPT-4.1

DeepSeek V3.1 Terminus leads GPT-4.1 on the Artificial Analysis Intelligence Index, 14.8 to 12.7, and DeepSeek V3.1 Terminus costs 7.9x less per output token ($1.0142 vs $8.00 per million). Updated October 22, 2026; 41 benchmarks have a result for both.

Replace DeepSeek V3.1 Terminus Replace GPT-4.1
DeepSeek V3.1 TerminusDeepSeek
Coding
No data
Overall
No data
Output $/M
$1.0142
40
GPT-4.1OpenAI
Coding
No data
Overall
36.5
Output $/M
$8.00
1
vs boards won of 41 shared

DeepSeek V3.1 Terminus or GPT-4.1: 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 7.9x cheaper ($1.0142 vs $8.00 per million) and work measured by τ²-Bench Telecom, where it leads.

Model ADeepSeek V3.1 TerminusDeepSeekNot benchmarkedNo coding benchmarkNo cost per solved taskModel BGPT-4.1OpenAINot benchmarkedNo coding benchmark$0.37 per solved task
Shared results
41
DeepSeek V3.1 Terminus only
4
GPT-4.1 only
51
Like-for-like categories
8 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, GPT-4.1 not benchmarked.
Widest category
Math, 38.5 points apart on average over 3 shared benchmarks.
Widest single gap
AA Math Index: DeepSeek V3.1 Terminus 89.7 against GPT-4.1 34.7, 55.0 points apart on a 0 to 100 scale.
Output price
DeepSeek V3.1 Terminus $1.0142 against GPT-4.1 $8.00 per million output tokens, 7.9x apart.
Context window
DeepSeek V3.1 Terminus takes 164K tokens, GPT-4.1 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 TerminusBarsGPT-4.1Ties
Coding50
Intelligence10
Agentic work01
Reasoning50
Math30
Knowledge50
Web design60
General150
All shared boards401
CodingLike-for-likeSix of these boards feed the Vibe Coding Index50
Coding benchmarks for DeepSeek V3.1 Terminus and GPT-4.1
BenchmarkDeepSeek V3.1 TerminusGPT-4.1Leader
Aider polyglotNot measured52.4%Only GPT-4.1 measured
SWE-bench VerifiedNot measured39.6%Only GPT-4.1 measured
SWE-bench MultimodalNot measured31.1%Only GPT-4.1 measured
AA Coding Index43.5Not measuredOnly DeepSeek V3.1 Terminus measured
LiveCodeBench (Vals AI)Not measured54.7%Only GPT-4.1 measured
LiveCodeBench (Artificial Analysis run)79.8%45.7%DeepSeek V3.1 Terminus
SciCode38.0%Not measuredOnly DeepSeek V3.1 Terminus measured
Terminal-Bench Hard (Artificial Analysis run)31.8%13.6%DeepSeek V3.1 Terminus
WeirdMLNot measured39.0%Only GPT-4.1 measured
ALE-Bench745.2558.1DeepSeek V3.1 Terminus
LMArena Text: coding14251390DeepSeek V3.1 Terminus
LMArena Text: software and IT14261391DeepSeek V3.1 Terminus
SciCodeNot measured4.6%Only GPT-4.1 measured
Neither model has a result on the other 26 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index10
Intelligence benchmarks for DeepSeek V3.1 Terminus and GPT-4.1
BenchmarkDeepSeek V3.1 TerminusGPT-4.1Leader
AA Intelligence Index14.812.7DeepSeek V3.1 Terminus
Epoch Capabilities IndexNot measured136.7Only GPT-4.1 measured
Agentic workLike-for-likePublic boards, shown as published, kept out of the index01
Agentic work benchmarks for DeepSeek V3.1 Terminus and GPT-4.1
BenchmarkDeepSeek V3.1 TerminusGPT-4.1Leader
AA Agentic Index6.8Not measuredOnly DeepSeek V3.1 Terminus measured
τ²-Bench Telecom37.1%47.1%GPT-4.1
Berkeley Function Calling Leaderboard (BFCL)Not measured54.0%Only GPT-4.1 measured
BrowseComp-PlusNot measured36.4%Only GPT-4.1 measured
Neither model has a result on the other 37 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index50
Reasoning benchmarks for DeepSeek V3.1 Terminus and GPT-4.1
BenchmarkDeepSeek V3.1 TerminusGPT-4.1Leader
GPQA DiamondNot measured65.4%Only GPT-4.1 measured
MMMU Pro (Vals AI)Not measured72.4%Only GPT-4.1 measured
GPQA Diamond (Artificial Analysis run)79.2%66.6%DeepSeek V3.1 Terminus
Humanity's Last Exam (Artificial Analysis run)16.4%4.2%DeepSeek V3.1 Terminus
GPQA Diamond (Epoch AI run)Not measured66.9%Only GPT-4.1 measured
ARC-AGINot measured5.5%Only GPT-4.1 measured
ARC-AGI-2Not measured0.4%Only GPT-4.1 measured
SimpleBenchNot measured27.0%Only GPT-4.1 measured
Chess puzzlesNot measured3.0%Only GPT-4.1 measured
LMArena Text: hard prompts14261384DeepSeek V3.1 Terminus
LMArena Text: expertNot measured1364Only GPT-4.1 measured
LMArena Text: hard prompts in English14321393DeepSeek V3.1 Terminus
LMArena Vision: diagramsNot measured1215Only GPT-4.1 measured
LMArena Vision: homeworkNot measured1248Only GPT-4.1 measured
Kagi LLM Benchmark57.4%52.3%DeepSeek V3.1 Terminus
Neither model has a result on the other 7 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index30
Math benchmarks for DeepSeek V3.1 Terminus and GPT-4.1
BenchmarkDeepSeek V3.1 TerminusGPT-4.1Leader
AIMENot measured39.6%Only GPT-4.1 measured
MATH 500 (Vals AI)Not measured87.2%Only GPT-4.1 measured
MGSM (Vals AI)Not measured87.7%Only GPT-4.1 measured
AA Math Index89.734.7DeepSeek V3.1 Terminus
AIME 2025 (Artificial Analysis run)89.7%34.7%DeepSeek V3.1 Terminus
OTIS Mock AIMENot measured38.3%Only GPT-4.1 measured
FrontierMath, tiers 1 to 3Not measured6.0%Only GPT-4.1 measured
MATH level 5Not measured83.0%Only GPT-4.1 measured
LMArena Text: math14021369DeepSeek V3.1 Terminus
LMArena Text: mathematical workNot measured1360Only GPT-4.1 measured
Neither model has a result on the other 3 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index50
Knowledge benchmarks for DeepSeek V3.1 Terminus and GPT-4.1
BenchmarkDeepSeek V3.1 TerminusGPT-4.1Leader
MMLU ProNot measured80.5%Only GPT-4.1 measured
LegalBench (Vals AI)Not measured83.1%Only GPT-4.1 measured
CaseLaw (Vals AI)Not measured69.9%Only GPT-4.1 measured
CorpFin (Vals AI)Not measured63.0%Only GPT-4.1 measured
TaxEval (Vals AI)Not measured75.1%Only GPT-4.1 measured
MortgageTax (Vals AI)Not measured65.9%Only GPT-4.1 measured
MedQA (Vals AI)Not measured91.2%Only GPT-4.1 measured
MMLU Pro (Artificial Analysis run)85.1%80.6%DeepSeek V3.1 Terminus
SimpleQA VerifiedNot measured31.1%Only GPT-4.1 measured
GeoBenchNot measured72.0%Only GPT-4.1 measured
LMArena Text: science14511382DeepSeek V3.1 Terminus
LMArena Text: medicine and healthcare14681379DeepSeek V3.1 Terminus
LMArena Text: legal and government14571399DeepSeek V3.1 Terminus
LMArena Text: business and finance14141369DeepSeek V3.1 Terminus
FACTS Benchmark SuiteNot measured45.8%Only GPT-4.1 measured
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 GPT-4.1
BenchmarkDeepSeek V3.1 TerminusGPT-4.1Leader
Design Arena: websites11871038DeepSeek V3.1 Terminus
Design Arena: UI components1182997DeepSeek V3.1 Terminus
Design Arena: game dev11311079DeepSeek V3.1 Terminus
Design Arena: data viz11681104DeepSeek V3.1 Terminus
Design Arena: 3D1141849DeepSeek V3.1 Terminus
Design Arena: all code categories11751025DeepSeek 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 index150
General benchmarks for DeepSeek V3.1 Terminus and GPT-4.1
BenchmarkDeepSeek V3.1 TerminusGPT-4.1Leader
IFBench57.0%43.0%DeepSeek V3.1 Terminus
Long context reasoning (AA-LCR)69.3%68.3%DeepSeek V3.1 Terminus
DTBench81.3%68.3%DeepSeek V3.1 Terminus
LMCA28.6%25.6%DeepSeek V3.1 Terminus
Fiction.LiveBenchNot measured63.9%Only GPT-4.1 measured
LMArena Text14191383DeepSeek V3.1 Terminus
LMArena Text: instruction following14041367DeepSeek V3.1 Terminus
LMArena Text: creative writing14031363DeepSeek V3.1 Terminus
LMArena VisionNot measured1210Only GPT-4.1 measured
LMArena Text: English14291392DeepSeek V3.1 Terminus
LMArena Text: non-English14081370DeepSeek V3.1 Terminus
LMArena Text: ChineseNot measured1382Only GPT-4.1 measured
LMArena Text: GermanNot measured1381Only GPT-4.1 measured
LMArena Text: JapaneseNot measured1319Only GPT-4.1 measured
LMArena Text: KoreanNot measured1338Only GPT-4.1 measured
LMArena Text: FrenchNot measured1382Only GPT-4.1 measured
LMArena Text: SpanishNot measured1376Only GPT-4.1 measured
LMArena Text: Russian14351377DeepSeek V3.1 Terminus
LMArena Text: Polish14271389DeepSeek V3.1 Terminus
LMArena Text: multi-turn14111397DeepSeek V3.1 Terminus
LMArena Text: longer queries14221385DeepSeek V3.1 Terminus
LMArena Text: writing and language14091371DeepSeek V3.1 Terminus
LMArena Text: entertainment and media13911365DeepSeek V3.1 Terminus
LMArena Vision: EnglishNot measured1209Only GPT-4.1 measured
LMArena Vision: ChineseNot measured1226Only GPT-4.1 measured
LMArena Vision: reading textNot measured1218Only GPT-4.1 measured
LMArena Vision: humorNot measured1196Only GPT-4.1 measured
LMArena Vision: captioningNot measured1207Only GPT-4.1 measured
LMArena Vision: recognizing thingsNot measured1208Only GPT-4.1 measured
LMArena Vision: creative writingNot measured1210Only GPT-4.1 measured
Neither model has a result on the other 16 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 GPT-4.1
BenchmarkDeepSeek V3.1 TerminusGPT-4.1Leader
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
GPT-4.1$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
GPT-4.1$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
GPT-4.1$0.480Fits in one request

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 GPT-4.1
SpecificationDeepSeek V3.1 TerminusOpenAI GPT-4.1
MakerDeepSeekOpenAI
WeightsOpen weightsNo public weights listed
ReleasedSeptember 22, 2025April 14, 2025
Context window164K1.05M
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$0.37
SourceOpenRouter listingOpenRouter listing

Questions

Is DeepSeek V3.1 Terminus better than GPT-4.1 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 7.9x cheaper ($1.0142 vs $8.00 per million) and work measured by τ²-Bench Telecom, where it leads.

Which is cheaper, DeepSeek V3.1 Terminus or GPT-4.1?

DeepSeek V3.1 Terminus costs $0.3063 per million input tokens and $1.0142 per million output tokens; GPT-4.1 costs $2.00 and $8.00. Cost per solved task is known for GPT-4.1 only.

Which has the bigger context window, DeepSeek V3.1 Terminus or GPT-4.1?

GPT-4.1, with 1.05M tokens against 164K.

How many benchmarks is the DeepSeek V3.1 Terminus vs GPT-4.1 comparison based on?

41 benchmarks have a result for both models as of October 22, 2026. DeepSeek V3.1 Terminus's coding index rests on 0 independent benchmarks and GPT-4.1's on 0. Where only one model has a result, the page says so instead of naming a winner.

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