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DeepSeek V3.1 Terminus vs gpt-oss-120b

DeepSeek V3.1 Terminus leads gpt-oss-120b on the Artificial Analysis Intelligence Index, 14.8 to 11.6, and gpt-oss-120b costs 2.0x less per output token ($0.50 vs $1.0142 per million). Updated October 22, 2026; 44 benchmarks have a result for both.

Replace DeepSeek V3.1 Terminus Replace gpt-oss-120b
DeepSeek V3.1 TerminusDeepSeek
Coding
No data
Overall
No data
Output $/M
$1.0142
37
gpt-oss-120bOpenAI
Coding
No data
Overall
50.0
Output $/M
$0.50
7
vs boards won of 44 shared

DeepSeek V3.1 Terminus or gpt-oss-120b: which to pick

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

Pick DeepSeek V3.1 Terminus for a larger context window (164K against 131K tokens) and work measured by LiveCodeBench (Artificial Analysis run) or τ²-Bench Telecom, where it leads.

Model ADeepSeek V3.1 TerminusDeepSeekNot benchmarkedNo coding benchmarkNo cost per solved taskModel Bgpt-oss-120bOpenAINot benchmarked1 independent benchmark$0.51 per solved task
Shared results
44
DeepSeek V3.1 Terminus only
1
gpt-oss-120b only
41
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-oss-120b not benchmarked.
Widest category
Web design, 26.0 points apart on average over 6 shared benchmarks.
Widest single gap
Design Arena: UI components: DeepSeek V3.1 Terminus 1180 against gpt-oss-120b 924, 32.0 points apart on a 0 to 100 scale.
Output price
DeepSeek V3.1 Terminus $1.0142 against gpt-oss-120b $0.50 per million output tokens, 2.0x apart.
Context window
DeepSeek V3.1 Terminus takes 164K tokens, gpt-oss-120b 131K.

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-oss-120bTies
Coding61
Intelligence10
Agentic work11
Reasoning32
Math12
Knowledge50
Web design60
General141
All shared boards377
CodingLike-for-likeSix of these boards feed the Vibe Coding Index61
Coding benchmarks for DeepSeek V3.1 Terminus and gpt-oss-120b
BenchmarkDeepSeek V3.1 Terminusgpt-oss-120bLeader
Aider polyglotNot measured41.8%Only gpt-oss-120b measured
SWE-bench VerifiedNot measured26.0%Only gpt-oss-120b measured
AA Coding Index43.530.4DeepSeek V3.1 Terminus
LiveCodeBench (Vals AI)Not measured83.2%Only gpt-oss-120b measured
SWE-bench Verified (Vals AI)Not measured33.6%Only gpt-oss-120b measured
LiveCodeBench (Artificial Analysis run)79.8%87.8%gpt-oss-120b
SciCode38.0%34.0%DeepSeek V3.1 Terminus
Terminal-Bench Hard (Artificial Analysis run)31.8%23.5%DeepSeek V3.1 Terminus
Terminal-BenchNot measured18.7%Only gpt-oss-120b measured
WeirdMLNot measured48.2%Only gpt-oss-120b measured
ALE-Bench745.2575.6DeepSeek V3.1 Terminus
LMArena Text: coding14251379DeepSeek V3.1 Terminus
LMArena Text: software and IT14261387DeepSeek V3.1 Terminus
SciCodeNot measured7.7%Only gpt-oss-120b measured
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-oss-120b
BenchmarkDeepSeek V3.1 Terminusgpt-oss-120bLeader
AA Intelligence Index14.811.6DeepSeek V3.1 Terminus
Epoch Capabilities IndexNot measured139.8Only gpt-oss-120b measured
Agentic workLike-for-likePublic boards, shown as published, kept out of the index11
Agentic work benchmarks for DeepSeek V3.1 Terminus and gpt-oss-120b
BenchmarkDeepSeek V3.1 Terminusgpt-oss-120bLeader
AA Agentic Index6.83.7DeepSeek V3.1 Terminus
τ²-Bench Telecom37.1%65.8%gpt-oss-120b
APEX-AgentsNot measured4.4%Only gpt-oss-120b measured
METR time horizonsNot measured56.6%Only gpt-oss-120b measured
Vending-Bench 2Not measured-$22Only gpt-oss-120b measured
BrowseComp-PlusNot measured67.0%Only gpt-oss-120b measured
Neither model has a result on the other 36 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index32
Reasoning benchmarks for DeepSeek V3.1 Terminus and gpt-oss-120b
BenchmarkDeepSeek V3.1 Terminusgpt-oss-120bLeader
GPQA DiamondNot measured78.5%Only gpt-oss-120b measured
GPQA Diamond (Artificial Analysis run)79.2%78.2%DeepSeek V3.1 Terminus
Humanity's Last Exam (Artificial Analysis run)16.4%19.6%gpt-oss-120b
GPQA Diamond (Epoch AI run)Not measured75.8%Only gpt-oss-120b measured
SimpleBenchNot measured22.1%Only gpt-oss-120b measured
Mystery game puzzlesNot measured2.0%Only gpt-oss-120b measured
LMArena Text: hard prompts14261364DeepSeek V3.1 Terminus
LMArena Text: expertNot measured1356Only gpt-oss-120b measured
LMArena Text: hard prompts in English14321368DeepSeek V3.1 Terminus
Kagi LLM Benchmark57.4%58.6%gpt-oss-120b
Neither model has a result on the other 13 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index12
Math benchmarks for DeepSeek V3.1 Terminus and gpt-oss-120b
BenchmarkDeepSeek V3.1 Terminusgpt-oss-120bLeader
AIMENot measured92.6%Only gpt-oss-120b measured
MATH 500 (Vals AI)Not measured94.8%Only gpt-oss-120b measured
MGSM (Vals AI)Not measured92.0%Only gpt-oss-120b measured
AA Math Index89.793.4gpt-oss-120b
AIME 2025 (Artificial Analysis run)89.7%93.4%gpt-oss-120b
OTIS Mock AIMENot measured88.9%Only gpt-oss-120b measured
LMArena Text: math14021389DeepSeek V3.1 Terminus
LMArena Text: mathematical workNot measured1386Only gpt-oss-120b measured
MathArenaNot measured15.1%Only gpt-oss-120b measured
Neither model has a result on the other 5 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index50
Knowledge benchmarks for DeepSeek V3.1 Terminus and gpt-oss-120b
BenchmarkDeepSeek V3.1 Terminusgpt-oss-120bLeader
MMLU ProNot measured79.2%Only gpt-oss-120b measured
LegalBench (Vals AI)Not measured75.9%Only gpt-oss-120b measured
CaseLaw (Vals AI)Not measured48.8%Only gpt-oss-120b measured
CorpFin (Vals AI)Not measured58.2%Only gpt-oss-120b measured
TaxEval (Vals AI)Not measured71.6%Only gpt-oss-120b measured
MedQA (Vals AI)Not measured91.4%Only gpt-oss-120b measured
MMLU Pro (Artificial Analysis run)85.1%80.8%DeepSeek V3.1 Terminus
LMArena Text: science14511382DeepSeek V3.1 Terminus
LMArena Text: medicine and healthcare14681388DeepSeek V3.1 Terminus
LMArena Text: legal and government14571355DeepSeek V3.1 Terminus
LMArena Text: business and finance14141359DeepSeek V3.1 Terminus
PRBench FinanceNot measured43.8%Only gpt-oss-120b measured
PRBench LegalNot measured40.2%Only gpt-oss-120b measured
Neither model has a result on the other 7 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-oss-120b
BenchmarkDeepSeek V3.1 Terminusgpt-oss-120bLeader
Design Arena: websites1187968DeepSeek V3.1 Terminus
Design Arena: UI components1180924DeepSeek V3.1 Terminus
Design Arena: game dev1131991DeepSeek V3.1 Terminus
Design Arena: data viz1168987DeepSeek V3.1 Terminus
Design Arena: 3D1141901DeepSeek 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 index141
General benchmarks for DeepSeek V3.1 Terminus and gpt-oss-120b
BenchmarkDeepSeek V3.1 Terminusgpt-oss-120bLeader
IFBench57.0%69.0%gpt-oss-120b
Long context reasoning (AA-LCR)69.3%52.0%DeepSeek V3.1 Terminus
DTBench81.3%76.3%DeepSeek V3.1 Terminus
LMCA28.6%22.1%DeepSeek V3.1 Terminus
Fiction.LiveBenchNot measured44.4%Only gpt-oss-120b measured
Creative writing (Lech Mazur)Not measured77.1%Only gpt-oss-120b measured
Surface Evolver BenchNot measured25.0%Only gpt-oss-120b measured
LMArena Text14191366DeepSeek V3.1 Terminus
LMArena Text: instruction following14041318DeepSeek V3.1 Terminus
LMArena Text: creative writing14031274DeepSeek V3.1 Terminus
LMArena Text: English14291375DeepSeek V3.1 Terminus
LMArena Text: non-English14081351DeepSeek V3.1 Terminus
LMArena Text: ChineseNot measured1385Only gpt-oss-120b measured
LMArena Text: GermanNot measured1353Only gpt-oss-120b measured
LMArena Text: JapaneseNot measured1331Only gpt-oss-120b measured
LMArena Text: KoreanNot measured1282Only gpt-oss-120b measured
LMArena Text: FrenchNot measured1370Only gpt-oss-120b measured
LMArena Text: SpanishNot measured1389Only gpt-oss-120b measured
LMArena Text: Russian14351343DeepSeek V3.1 Terminus
LMArena Text: Polish14271353DeepSeek V3.1 Terminus
LMArena Text: multi-turn14111340DeepSeek V3.1 Terminus
LMArena Text: longer queries14221319DeepSeek V3.1 Terminus
LMArena Text: writing and language14091306DeepSeek V3.1 Terminus
LMArena Text: entertainment and media13911292DeepSeek V3.1 Terminus
MultiChallengeNot measured45.3%Only gpt-oss-120b measured
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 gpt-oss-120b
BenchmarkDeepSeek V3.1 Terminusgpt-oss-120bLeader
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-oss-120b$0.0003Fits in one request

gpt-oss-120b costs less

Repository review

50K input + 3K output tokens

DeepSeek V3.1 Terminus$0.018Fits in one request
gpt-oss-120b$0.0065Fits in one request

gpt-oss-120b costs less

Agent loop

200K input + 10K output tokens

DeepSeek V3.1 Terminus$0.071Exceeds the context window
gpt-oss-120b$0.025Exceeds the context window

gpt-oss-120b 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-oss-120b
SpecificationDeepSeek V3.1 TerminusOpenAI gpt-oss-120b
MakerDeepSeekOpenAI
WeightsOpen weightsOpen weights
ReleasedSeptember 22, 2025August 5, 2025
Context window164K131K
Input $/Mtok$0.3063$0.10
Output $/Mtok$1.0142$0.50
Coding indexNot benchmarkedNot benchmarked
Independent measurements behind it01
Cost per solved taskNot computable$0.51
SourceOpenRouter listingOpenRouter listing

Questions

Is DeepSeek V3.1 Terminus better than gpt-oss-120b for coding?

Neither model has a coding score yet, so the two cannot be ranked on coding. Pick DeepSeek V3.1 Terminus for a larger context window (164K against 131K tokens) and work measured by LiveCodeBench (Artificial Analysis run) or τ²-Bench Telecom, where it leads.

Which is cheaper, DeepSeek V3.1 Terminus or gpt-oss-120b?

DeepSeek V3.1 Terminus costs $0.3063 per million input tokens and $1.0142 per million output tokens; gpt-oss-120b costs $0.10 and $0.50. Cost per solved task is known for gpt-oss-120b only.

Which has the bigger context window, DeepSeek V3.1 Terminus or gpt-oss-120b?

DeepSeek V3.1 Terminus, with 164K tokens against 131K.

How many benchmarks is the DeepSeek V3.1 Terminus vs gpt-oss-120b comparison based on?

44 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-oss-120b's on 1. Where only one model has a result, the page says so instead of naming a winner.

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