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gpt-oss-120b vs Kimi K2 0711

Kimi K2 0711 leads gpt-oss-120b on the Artificial Analysis Intelligence Index, 12.7 to 11.6, and gpt-oss-120b costs 4.6x less per output token ($0.50 vs $2.30 per million). Updated October 21, 2026; 35 benchmarks have a result for both.

Replace gpt-oss-120b Replace Kimi K2 0711
gpt-oss-120bOpenAI
Coding
No data
Overall
50.0
Output $/M
$0.50
18
Kimi K2 0711Moonshot AI
Coding
No data
Overall
No data
Output $/M
$2.30
17
vs boards won of 35 shared

gpt-oss-120b or Kimi K2 0711: which to pick

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

Pick gpt-oss-120b for output tokens 4.6x cheaper ($0.50 vs $2.30 per million) and work measured by Aider polyglot or SWE-bench Verified, where it leads.

Model Agpt-oss-120bOpenAINot benchmarked1 independent benchmark$0.51 per solved taskModel BKimi K2 0711Moonshot AINot benchmarkedNo coding benchmarkNo cost per solved task
Shared results
35
gpt-oss-120b only
46
Kimi K2 0711 only
2
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
gpt-oss-120b not benchmarked, Kimi K2 0711 not benchmarked.
Widest category
Math, 20.9 points apart on average over 5 shared benchmarks.
Widest single gap
SWE-bench Verified: gpt-oss-120b 26.0% against Kimi K2 0711 71.2%, 45.2 points apart on a 0 to 100 scale.
Output price
gpt-oss-120b $0.50 against Kimi K2 0711 $2.30 per million output tokens, 4.6x apart.
Context window
Both take 131K tokens.

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
Categorygpt-oss-120bBarsKimi K2 0711Ties
Coding43
Intelligence02
Agentic work10
Reasoning32
Math50
Knowledge33
Web design14
General13
All shared boards1817
CodingLike-for-likeSix of these boards feed the Vibe Coding Index43
Coding benchmarks for gpt-oss-120b and Kimi K2 0711
Benchmarkgpt-oss-120bKimi K2 0711Leader
Aider polyglot41.8%59.1%Kimi K2 0711
SWE-bench Verified26.0%71.2%Kimi K2 0711
AA Coding Index30.4Not measuredOnly gpt-oss-120b measured
LiveCodeBench (Vals AI)83.2%70.5%gpt-oss-120b
SWE-bench Verified (Vals AI)33.6%Not measuredOnly gpt-oss-120b measured
LiveCodeBench (Artificial Analysis run)87.8%55.6%gpt-oss-120b
SciCode34.0%Not measuredOnly gpt-oss-120b measured
Terminal-Bench Hard (Artificial Analysis run)23.5%15.9%gpt-oss-120b
Terminal-Bench18.7%27.8%Kimi K2 0711
GSO-BenchNot measured4.9%Only Kimi K2 0711 measured
WeirdML48.2%39.4%gpt-oss-120b
ALE-Bench575.6Not measuredOnly gpt-oss-120b measured
LMArena Text: coding1379Not measuredOnly gpt-oss-120b measured
LMArena Text: software and IT1387Not measuredOnly gpt-oss-120b measured
SciCode7.7%Not measuredOnly gpt-oss-120b measured
Neither model has a result on the other 24 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index02
Intelligence benchmarks for gpt-oss-120b and Kimi K2 0711
Benchmarkgpt-oss-120bKimi K2 0711Leader
AA Intelligence Index11.612.7Kimi K2 0711
Epoch Capabilities Index139.8140.0Kimi K2 0711
Agentic workLike-for-likePublic boards, shown as published, kept out of the index10
Agentic work benchmarks for gpt-oss-120b and Kimi K2 0711
Benchmarkgpt-oss-120bKimi K2 0711Leader
AA Agentic Index3.7Not measuredOnly gpt-oss-120b measured
τ²-Bench Telecom65.8%61.1%gpt-oss-120b
APEX-Agents4.4%Not measuredOnly gpt-oss-120b measured
METR time horizons56.6%Not measuredOnly gpt-oss-120b measured
Vending-Bench 2-$22Not measuredOnly gpt-oss-120b measured
BrowseComp-Plus67.0%Not measuredOnly gpt-oss-120b measured
Neither model has a result on the other 35 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index32
Reasoning benchmarks for gpt-oss-120b and Kimi K2 0711
Benchmarkgpt-oss-120bKimi K2 0711Leader
GPQA Diamond78.5%71.5%gpt-oss-120b
GPQA Diamond (Artificial Analysis run)78.2%76.6%gpt-oss-120b
Humanity's Last Exam (Artificial Analysis run)19.6%7.4%gpt-oss-120b
GPQA Diamond (Epoch AI run)75.8%Not measuredOnly gpt-oss-120b measured
SimpleBench22.1%26.3%Kimi K2 0711
Mystery game puzzles2.0%Not measuredOnly gpt-oss-120b measured
LMArena Text: hard prompts1364Not measuredOnly gpt-oss-120b measured
LMArena Text: expert1356Not measuredOnly gpt-oss-120b measured
LMArena Text: hard prompts in English1368Not measuredOnly gpt-oss-120b measured
Kagi LLM Benchmark58.6%64.4%Kimi K2 0711
Neither model has a result on the other 12 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index50
Math benchmarks for gpt-oss-120b and Kimi K2 0711
Benchmarkgpt-oss-120bKimi K2 0711Leader
AIME92.6%62.7%gpt-oss-120b
MATH 500 (Vals AI)94.8%94.2%gpt-oss-120b
MGSM (Vals AI)92.0%91.0%gpt-oss-120b
AA Math Index93.457.0gpt-oss-120b
AIME 2025 (Artificial Analysis run)93.4%57.0%gpt-oss-120b
OTIS Mock AIME88.9%Not measuredOnly gpt-oss-120b measured
LMArena Text: math1389Not measuredOnly gpt-oss-120b measured
LMArena Text: mathematical work1386Not measuredOnly 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 index33
Knowledge benchmarks for gpt-oss-120b and Kimi K2 0711
Benchmarkgpt-oss-120bKimi K2 0711Leader
MMLU Pro79.2%79.4%Kimi K2 0711
LegalBench (Vals AI)75.9%81.5%Kimi K2 0711
CaseLaw (Vals AI)48.8%Not measuredOnly gpt-oss-120b measured
CorpFin (Vals AI)58.2%50.4%gpt-oss-120b
TaxEval (Vals AI)71.6%70.2%gpt-oss-120b
MedQA (Vals AI)91.4%84.0%gpt-oss-120b
MMLU Pro (Artificial Analysis run)80.8%82.4%Kimi K2 0711
LMArena Text: science1382Not measuredOnly gpt-oss-120b measured
LMArena Text: medicine and healthcare1388Not measuredOnly gpt-oss-120b measured
LMArena Text: legal and government1355Not measuredOnly gpt-oss-120b measured
LMArena Text: business and finance1359Not measuredOnly 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 index14
Web design benchmarks for gpt-oss-120b and Kimi K2 0711
Benchmarkgpt-oss-120bKimi K2 0711Leader
Design Arena: websites9681050Kimi K2 0711
Design Arena: UI components9271030Kimi K2 0711
Design Arena: game dev992974gpt-oss-120b
Design Arena: data viz9871018Kimi K2 0711
Design Arena: 3D901Not measuredOnly gpt-oss-120b measured
Design Arena: all code categories9631033Kimi K2 0711
Neither model has a result on the other 3 boards here
GeneralLike-for-likePublic boards, shown as published, kept out of the index13
General benchmarks for gpt-oss-120b and Kimi K2 0711
Benchmarkgpt-oss-120bKimi K2 0711Leader
IFBench69.0%41.5%gpt-oss-120b
Long context reasoning (AA-LCR)52.0%53.0%Kimi K2 0711
DTBench76.3%Not measuredOnly gpt-oss-120b measured
LMCA22.1%Not measuredOnly gpt-oss-120b measured
Fiction.LiveBench44.4%61.1%Kimi K2 0711
Creative writing (Lech Mazur)77.1%85.6%Kimi K2 0711
CL-benchNot measured11.9%Only Kimi K2 0711 measured
Surface Evolver Bench25.0%Not measuredOnly gpt-oss-120b measured
LMArena Text1366Not measuredOnly gpt-oss-120b measured
LMArena Text: instruction following1318Not measuredOnly gpt-oss-120b measured
LMArena Text: creative writing1274Not measuredOnly gpt-oss-120b measured
LMArena Text: English1375Not measuredOnly gpt-oss-120b measured
LMArena Text: non-English1351Not measuredOnly gpt-oss-120b measured
LMArena Text: Chinese1385Not measuredOnly gpt-oss-120b measured
LMArena Text: German1353Not measuredOnly gpt-oss-120b measured
LMArena Text: Japanese1331Not measuredOnly gpt-oss-120b measured
LMArena Text: Korean1282Not measuredOnly gpt-oss-120b measured
LMArena Text: French1370Not measuredOnly gpt-oss-120b measured
LMArena Text: Spanish1389Not measuredOnly gpt-oss-120b measured
LMArena Text: Russian1343Not measuredOnly gpt-oss-120b measured
LMArena Text: Polish1353Not measuredOnly gpt-oss-120b measured
LMArena Text: multi-turn1340Not measuredOnly gpt-oss-120b measured
LMArena Text: longer queries1319Not measuredOnly gpt-oss-120b measured
LMArena Text: writing and language1306Not measuredOnly gpt-oss-120b measured
LMArena Text: entertainment and media1292Not measuredOnly gpt-oss-120b measured
Neither model has a result on the other 21 boards here
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
Image generation benchmarks for gpt-oss-120b and Kimi K2 0711
Benchmarkgpt-oss-120bKimi K2 0711Leader
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

gpt-oss-120b$0.0003Fits in one request
Kimi K2 0711$0.0017Fits in one request

gpt-oss-120b costs less

Repository review

50K input + 3K output tokens

gpt-oss-120b$0.0065Fits in one request
Kimi K2 0711$0.035Fits in one request

gpt-oss-120b costs less

Agent loop

200K input + 10K output tokens

gpt-oss-120b$0.025Exceeds the context window
Kimi K2 0711$0.137Exceeds 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 gpt-oss-120b and Kimi K2 0711
SpecificationOpenAI gpt-oss-120bMoonshotAI Kimi K2 0711
MakerOpenAIMoonshot AI
WeightsOpen weightsOpen weights
ReleasedAugust 5, 2025July 11, 2025
Context window131K131K
Input $/Mtok$0.10$0.57
Output $/Mtok$0.50$2.30
Coding indexNot benchmarkedNot benchmarked
Independent measurements behind it10
Cost per solved task$0.51Not computable
SourceOpenRouter listingOpenRouter listing

Questions

Is gpt-oss-120b better than Kimi K2 0711 for coding?

Neither model has a coding score yet, so the two cannot be ranked on coding. Pick gpt-oss-120b for output tokens 4.6x cheaper ($0.50 vs $2.30 per million) and work measured by Aider polyglot or SWE-bench Verified, where it leads.

Which is cheaper, gpt-oss-120b or Kimi K2 0711?

gpt-oss-120b costs $0.10 per million input tokens and $0.50 per million output tokens; Kimi K2 0711 costs $0.57 and $2.30. Cost per solved task is known for gpt-oss-120b only.

Which has the bigger context window, gpt-oss-120b or Kimi K2 0711?

Neither: both take 131K tokens.

How many benchmarks is the gpt-oss-120b vs Kimi K2 0711 comparison based on?

35 benchmarks have a result for both models as of October 21, 2026. gpt-oss-120b's coding index rests on 1 independent benchmark and Kimi K2 0711's on 0. Where only one model has a result, the page says so instead of naming a winner.

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