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DeepSeek V3.1 Terminus vs GPT-4.1 Nano

DeepSeek V3.1 Terminus leads GPT-4.1 Nano on the Artificial Analysis Intelligence Index, 14.8 to 7.8, and GPT-4.1 Nano costs 2.5x less per output token ($0.40 vs $1.0142 per million). Updated October 22, 2026; 40 benchmarks have a result for both.

Replace DeepSeek V3.1 Terminus Replace GPT-4.1 Nano
DeepSeek V3.1 TerminusDeepSeek
Coding
No data
Overall
No data
Output $/M
$1.0142
40
GPT-4.1 NanoOpenAI
Coding
No data
Overall
24.7
Output $/M
$0.40
0
vs boards won of 40 shared

DeepSeek V3.1 Terminus or GPT-4.1 Nano: which to pick

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

Compare them on price, context and the boards below.

Model ADeepSeek V3.1 TerminusDeepSeekNot benchmarkedNo coding benchmarkNo cost per solved taskModel BGPT-4.1 NanoOpenAINot benchmarkedNo coding benchmarkNo cost per solved task
Shared results
40
DeepSeek V3.1 Terminus only
5
GPT-4.1 Nano only
31
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 Nano not benchmarked.
Widest category
Math, 50.9 points apart on average over 3 shared benchmarks.
Widest single gap
AA Math Index: DeepSeek V3.1 Terminus 89.7 against GPT-4.1 Nano 24.0, 65.7 points apart on a 0 to 100 scale.
Output price
DeepSeek V3.1 Terminus $1.0142 against GPT-4.1 Nano $0.40 per million output tokens, 2.5x apart.
Context window
DeepSeek V3.1 Terminus takes 164K tokens, GPT-4.1 Nano 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-4.1 NanoTies
Coding50
Intelligence10
Agentic work10
Reasoning50
Math30
Knowledge50
Web design60
General140
All shared boards400
CodingLike-for-likeSix of these boards feed the Vibe Coding Index50
Coding benchmarks for DeepSeek V3.1 Terminus and GPT-4.1 Nano
BenchmarkDeepSeek V3.1 TerminusGPT-4.1 NanoLeader
Aider polyglotNot measured8.9%Only GPT-4.1 Nano measured
AA Coding Index43.511.1DeepSeek V3.1 Terminus
LiveCodeBench (Vals AI)Not measured42.7%Only GPT-4.1 Nano measured
LiveCodeBench (Artificial Analysis run)79.8%32.6%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
WeirdMLNot measured19.0%Only GPT-4.1 Nano measured
ALE-Bench745.2Not measuredOnly DeepSeek V3.1 Terminus measured
LMArena Text: coding14251306DeepSeek V3.1 Terminus
LMArena Text: software and IT14261305DeepSeek V3.1 Terminus
Neither model has a result on the other 29 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 Nano
BenchmarkDeepSeek V3.1 TerminusGPT-4.1 NanoLeader
AA Intelligence Index14.87.8DeepSeek V3.1 Terminus
Epoch Capabilities IndexNot measured129.5Only GPT-4.1 Nano measured
Agentic workLike-for-likePublic boards, shown as published, kept out of the index10
Agentic work benchmarks for DeepSeek V3.1 Terminus and GPT-4.1 Nano
BenchmarkDeepSeek V3.1 TerminusGPT-4.1 NanoLeader
AA Agentic Index6.8Not measuredOnly DeepSeek V3.1 Terminus measured
τ²-Bench Telecom37.1%17.3%DeepSeek V3.1 Terminus
Berkeley Function Calling Leaderboard (BFCL)Not measured33.1%Only GPT-4.1 Nano measured
Neither model has a result on the other 38 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 Nano
BenchmarkDeepSeek V3.1 TerminusGPT-4.1 NanoLeader
GPQA DiamondNot measured50.8%Only GPT-4.1 Nano measured
MMMU Pro (Vals AI)Not measured55.0%Only GPT-4.1 Nano measured
GPQA Diamond (Artificial Analysis run)79.2%51.2%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 measured48.9%Only GPT-4.1 Nano measured
ARC-AGINot measured0.0%Only GPT-4.1 Nano measured
ARC-AGI-2Not measured0.0%Only GPT-4.1 Nano measured
Chess puzzlesNot measured0.0%Only GPT-4.1 Nano measured
LMArena Text: hard prompts14261286DeepSeek V3.1 Terminus
LMArena Text: expertNot measured1271Only GPT-4.1 Nano measured
LMArena Text: hard prompts in English14321293DeepSeek V3.1 Terminus
Kagi LLM Benchmark57.4%33.3%DeepSeek V3.1 Terminus
Neither model has a result on the other 10 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 Nano
BenchmarkDeepSeek V3.1 TerminusGPT-4.1 NanoLeader
AIMENot measured26.5%Only GPT-4.1 Nano measured
MATH 500 (Vals AI)Not measured80.2%Only GPT-4.1 Nano measured
MGSM (Vals AI)Not measured69.3%Only GPT-4.1 Nano measured
AA Math Index89.724.0DeepSeek V3.1 Terminus
AIME 2025 (Artificial Analysis run)89.7%24.0%DeepSeek V3.1 Terminus
OTIS Mock AIMENot measured28.9%Only GPT-4.1 Nano measured
MATH level 5Not measured70.0%Only GPT-4.1 Nano measured
LMArena Text: math14021274DeepSeek V3.1 Terminus
LMArena Text: mathematical workNot measured1274Only GPT-4.1 Nano measured
Neither model has a result on the other 4 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 Nano
BenchmarkDeepSeek V3.1 TerminusGPT-4.1 NanoLeader
MMLU ProNot measured63.5%Only GPT-4.1 Nano measured
LegalBench (Vals AI)Not measured61.1%Only GPT-4.1 Nano measured
CorpFin (Vals AI)Not measured42.1%Only GPT-4.1 Nano measured
TaxEval (Vals AI)Not measured60.8%Only GPT-4.1 Nano measured
MortgageTax (Vals AI)Not measured52.8%Only GPT-4.1 Nano measured
MedQA (Vals AI)Not measured68.2%Only GPT-4.1 Nano measured
MMLU Pro (Artificial Analysis run)85.1%65.7%DeepSeek V3.1 Terminus
SimpleQA VerifiedNot measured6.0%Only GPT-4.1 Nano measured
LMArena Text: science14511297DeepSeek V3.1 Terminus
LMArena Text: medicine and healthcare14681276DeepSeek V3.1 Terminus
LMArena Text: legal and government14571300DeepSeek V3.1 Terminus
LMArena Text: business and finance14141267DeepSeek V3.1 Terminus
Neither model has a result on the other 6 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 Nano
BenchmarkDeepSeek V3.1 TerminusGPT-4.1 NanoLeader
Design Arena: websites1187972DeepSeek V3.1 Terminus
Design Arena: UI components1182913DeepSeek V3.1 Terminus
Design Arena: game dev1131970DeepSeek V3.1 Terminus
Design Arena: data viz1168891DeepSeek V3.1 Terminus
Design Arena: 3D1141924DeepSeek V3.1 Terminus
Design Arena: all code categories1175962DeepSeek 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 index140
General benchmarks for DeepSeek V3.1 Terminus and GPT-4.1 Nano
BenchmarkDeepSeek V3.1 TerminusGPT-4.1 NanoLeader
IFBench57.0%32.0%DeepSeek V3.1 Terminus
Long context reasoning (AA-LCR)69.3%20.3%DeepSeek V3.1 Terminus
DTBench81.3%52.5%DeepSeek V3.1 Terminus
LMCA28.6%5.5%DeepSeek V3.1 Terminus
Fiction.LiveBenchNot measured25.0%Only GPT-4.1 Nano measured
LMArena Text14191285DeepSeek V3.1 Terminus
LMArena Text: instruction following14041266DeepSeek V3.1 Terminus
LMArena Text: creative writing14031260DeepSeek V3.1 Terminus
LMArena VisionNot measured1063Only GPT-4.1 Nano measured
LMArena Text: English14291303DeepSeek V3.1 Terminus
LMArena Text: non-English14081260DeepSeek V3.1 Terminus
LMArena Text: ChineseNot measured1270Only GPT-4.1 Nano measured
LMArena Text: GermanNot measured1288Only GPT-4.1 Nano measured
LMArena Text: JapaneseNot measured1198Only GPT-4.1 Nano measured
LMArena Text: Russian14351261DeepSeek V3.1 Terminus
LMArena Text: Polish1427Not measuredOnly DeepSeek V3.1 Terminus measured
LMArena Text: multi-turn14111277DeepSeek V3.1 Terminus
LMArena Text: longer queries14221283DeepSeek V3.1 Terminus
LMArena Text: writing and language14091261DeepSeek V3.1 Terminus
LMArena Text: entertainment and media13911243DeepSeek V3.1 Terminus
LMArena Vision: EnglishNot measured1101Only GPT-4.1 Nano measured
Neither model has a result on the other 25 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 Nano
BenchmarkDeepSeek V3.1 TerminusGPT-4.1 NanoLeader
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 Nano$0.0003Fits in one request

GPT-4.1 Nano costs less

Repository review

50K input + 3K output tokens

DeepSeek V3.1 Terminus$0.018Fits in one request
GPT-4.1 Nano$0.0062Fits in one request

GPT-4.1 Nano costs less

Agent loop

200K input + 10K output tokens

DeepSeek V3.1 Terminus$0.071Exceeds the context window
GPT-4.1 Nano$0.024Fits in one request

GPT-4.1 Nano 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 Nano
SpecificationDeepSeek V3.1 TerminusOpenAI GPT-4.1 Nano
MakerDeepSeekOpenAI
WeightsOpen weightsNo public weights listed
ReleasedSeptember 22, 2025April 14, 2025
Context window164K1.05M
Input $/Mtok$0.3063$0.10
Output $/Mtok$1.0142$0.40
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 GPT-4.1 Nano for coding?

Neither model has a coding score yet, so the two cannot be ranked on coding. Compare them on price, context and the boards below.

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

DeepSeek V3.1 Terminus costs $0.3063 per million input tokens and $1.0142 per million output tokens; GPT-4.1 Nano costs $0.10 and $0.40. Cost per solved task is known for neither of them.

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

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

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

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

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