Enter opens the highlighted result. Esc closes.

DeepSeek V3.1 Terminus vs gpt-oss-20b

DeepSeek V3.1 Terminus leads gpt-oss-20b on the Artificial Analysis Intelligence Index, 14.8 to 10.0, and gpt-oss-20b costs 6.8x less per output token ($0.15 vs $1.0142 per million). Updated October 22, 2026; 38 benchmarks have a result for both.

Replace DeepSeek V3.1 Terminus Replace gpt-oss-20b
DeepSeek V3.1 TerminusDeepSeek
Coding
No data
Overall
No data
Output $/M
$1.0142
35
gpt-oss-20bOpenAI
Coding
No data
Overall
38.5
Output $/M
$0.15
3
vs boards won of 38 shared

DeepSeek V3.1 Terminus or gpt-oss-20b: 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 SciCode or τ²-Bench Telecom, where it leads.

Model ADeepSeek V3.1 TerminusDeepSeekNot benchmarkedNo coding benchmarkNo cost per solved taskModel Bgpt-oss-20bOpenAINot benchmarkedNo coding benchmarkNo cost per solved task
Shared results
38
DeepSeek V3.1 Terminus only
7
gpt-oss-20b only
24
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-20b not benchmarked.
Widest category
Web design, 35.6 points apart on average over 2 shared benchmarks.
Widest single gap
Design Arena: websites: DeepSeek V3.1 Terminus 1187 against gpt-oss-20b 852, 41.9 points apart on a 0 to 100 scale.
Output price
DeepSeek V3.1 Terminus $1.0142 against gpt-oss-20b $0.15 per million output tokens, 6.8x apart.
Context window
DeepSeek V3.1 Terminus takes 164K tokens, gpt-oss-20b 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-20bTies
Coding51
Intelligence10
Agentic work01
Reasoning50
Math30
Knowledge50
Web design20
General141
All shared boards353
CodingLike-for-likeSix of these boards feed the Vibe Coding Index51
Coding benchmarks for DeepSeek V3.1 Terminus and gpt-oss-20b
BenchmarkDeepSeek V3.1 Terminusgpt-oss-20bLeader
AA Coding Index43.5Not measuredOnly DeepSeek V3.1 Terminus measured
LiveCodeBench (Vals AI)Not measured80.4%Only gpt-oss-20b measured
LiveCodeBench (Artificial Analysis run)79.8%77.7%DeepSeek V3.1 Terminus
SciCode38.0%38.9%gpt-oss-20b
Terminal-Bench Hard (Artificial Analysis run)31.8%10.6%DeepSeek V3.1 Terminus
Terminal-BenchNot measured3.4%Only gpt-oss-20b measured
WeirdMLNot measured40.9%Only gpt-oss-20b measured
ALE-Bench745.2566.0DeepSeek V3.1 Terminus
LMArena Text: coding14251307DeepSeek V3.1 Terminus
LMArena Text: software and IT14261311DeepSeek 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-oss-20b
BenchmarkDeepSeek V3.1 Terminusgpt-oss-20bLeader
AA Intelligence Index14.810.0DeepSeek V3.1 Terminus
Epoch Capabilities IndexNot measured137.7Only gpt-oss-20b measured
Agentic workLike-for-likePublic boards, shown as published, kept out of the index01
Agentic work benchmarks for DeepSeek V3.1 Terminus and gpt-oss-20b
BenchmarkDeepSeek V3.1 Terminusgpt-oss-20bLeader
AA Agentic Index6.8Not measuredOnly DeepSeek V3.1 Terminus measured
τ²-Bench Telecom37.1%60.2%gpt-oss-20b
BrowseComp-PlusNot measured50.6%Only gpt-oss-20b 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-oss-20b
BenchmarkDeepSeek V3.1 Terminusgpt-oss-20bLeader
GPQA DiamondNot measured68.9%Only gpt-oss-20b measured
GPQA Diamond (Artificial Analysis run)79.2%68.8%DeepSeek V3.1 Terminus
Humanity's Last Exam (Artificial Analysis run)16.4%11.0%DeepSeek V3.1 Terminus
GPQA Diamond (Epoch AI run)Not measured60.8%Only gpt-oss-20b measured
LMArena Text: hard prompts14261274DeepSeek V3.1 Terminus
LMArena Text: expertNot measured1258Only gpt-oss-20b measured
LMArena Text: hard prompts in English14321292DeepSeek V3.1 Terminus
Kagi LLM Benchmark57.4%53.2%DeepSeek V3.1 Terminus
Neither model has a result on the other 14 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index30
Math benchmarks for DeepSeek V3.1 Terminus and gpt-oss-20b
BenchmarkDeepSeek V3.1 Terminusgpt-oss-20bLeader
AIMENot measured86.0%Only gpt-oss-20b measured
MATH 500 (Vals AI)Not measured94.2%Only gpt-oss-20b measured
MGSM (Vals AI)Not measured89.0%Only gpt-oss-20b measured
AA Math Index89.789.3DeepSeek V3.1 Terminus
AIME 2025 (Artificial Analysis run)89.7%89.3%DeepSeek V3.1 Terminus
OTIS Mock AIMENot measured65.3%Only gpt-oss-20b measured
LMArena Text: math14021317DeepSeek V3.1 Terminus
LMArena Text: mathematical workNot measured1305Only gpt-oss-20b 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-20b
BenchmarkDeepSeek V3.1 Terminusgpt-oss-20bLeader
MMLU ProNot measured71.6%Only gpt-oss-20b measured
LegalBench (Vals AI)Not measured70.8%Only gpt-oss-20b measured
CaseLaw (Vals AI)Not measured43.8%Only gpt-oss-20b measured
CorpFin (Vals AI)Not measured53.1%Only gpt-oss-20b measured
TaxEval (Vals AI)Not measured63.7%Only gpt-oss-20b measured
MedQA (Vals AI)Not measured82.9%Only gpt-oss-20b measured
MMLU Pro (Artificial Analysis run)85.1%74.8%DeepSeek V3.1 Terminus
LMArena Text: science14511296DeepSeek V3.1 Terminus
LMArena Text: medicine and healthcare14681310DeepSeek V3.1 Terminus
LMArena Text: legal and government14571280DeepSeek V3.1 Terminus
LMArena Text: business and finance14141284DeepSeek V3.1 Terminus
Neither model has a result on the other 7 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index20
Web design benchmarks for DeepSeek V3.1 Terminus and gpt-oss-20b
BenchmarkDeepSeek V3.1 Terminusgpt-oss-20bLeader
Design Arena: websites1187852DeepSeek V3.1 Terminus
Design Arena: UI components1182Not measuredOnly DeepSeek V3.1 Terminus measured
Design Arena: game dev1131Not measuredOnly DeepSeek V3.1 Terminus measured
Design Arena: data viz1168933DeepSeek V3.1 Terminus
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 index141
General benchmarks for DeepSeek V3.1 Terminus and gpt-oss-20b
BenchmarkDeepSeek V3.1 Terminusgpt-oss-20bLeader
IFBench57.0%65.1%gpt-oss-20b
Long context reasoning (AA-LCR)69.3%34.7%DeepSeek V3.1 Terminus
DTBench81.3%68.0%DeepSeek V3.1 Terminus
LMCA28.6%14.5%DeepSeek V3.1 Terminus
LMArena Text14191288DeepSeek V3.1 Terminus
LMArena Text: instruction following14041236DeepSeek V3.1 Terminus
LMArena Text: creative writing14031201DeepSeek V3.1 Terminus
LMArena Text: English14291303DeepSeek V3.1 Terminus
LMArena Text: non-English14081269DeepSeek V3.1 Terminus
LMArena Text: ChineseNot measured1315Only gpt-oss-20b measured
LMArena Text: GermanNot measured1255Only gpt-oss-20b measured
LMArena Text: JapaneseNot measured1244Only gpt-oss-20b measured
LMArena Text: KoreanNot measured1236Only gpt-oss-20b measured
LMArena Text: SpanishNot measured1267Only gpt-oss-20b measured
LMArena Text: Russian14351278DeepSeek V3.1 Terminus
LMArena Text: Polish14271252DeepSeek V3.1 Terminus
LMArena Text: multi-turn14111268DeepSeek V3.1 Terminus
LMArena Text: longer queries14221250DeepSeek V3.1 Terminus
LMArena Text: writing and language14091238DeepSeek V3.1 Terminus
LMArena Text: entertainment and media13911216DeepSeek V3.1 Terminus
Neither model has a result on the other 26 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-20b
BenchmarkDeepSeek V3.1 Terminusgpt-oss-20bLeader
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-20b$0.0001Fits in one request

gpt-oss-20b costs less

Repository review

50K input + 3K output tokens

DeepSeek V3.1 Terminus$0.018Fits in one request
gpt-oss-20b$0.0019Fits in one request

gpt-oss-20b costs less

Agent loop

200K input + 10K output tokens

DeepSeek V3.1 Terminus$0.071Exceeds the context window
gpt-oss-20b$0.0075Exceeds the context window

gpt-oss-20b 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-20b
SpecificationDeepSeek V3.1 TerminusOpenAI gpt-oss-20b
MakerDeepSeekOpenAI
WeightsOpen weightsOpen weights
ReleasedSeptember 22, 2025August 5, 2025
Context window164K131K
Input $/Mtok$0.3063$0.03
Output $/Mtok$1.0142$0.15
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-oss-20b 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 SciCode or τ²-Bench Telecom, where it leads.

Which is cheaper, DeepSeek V3.1 Terminus or gpt-oss-20b?

DeepSeek V3.1 Terminus costs $0.3063 per million input tokens and $1.0142 per million output tokens; gpt-oss-20b costs $0.03 and $0.15. Cost per solved task is known for neither of them.

Which has the bigger context window, DeepSeek V3.1 Terminus or gpt-oss-20b?

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

How many benchmarks is the DeepSeek V3.1 Terminus vs gpt-oss-20b comparison based on?

38 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-20b's on 0. Where only one model has a result, the page says so instead of naming a winner.

Compare next