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gpt-oss-120b vs Granite 4.2 8B

gpt-oss-120b leads Granite 4.2 8B on the Artificial Analysis Intelligence Index, 11.6 to 11.1, and Granite 4.2 8B costs 2.5x less per output token ($0.20 vs $0.50 per million). Updated October 22, 2026; 27 benchmarks have a result for both.

Replace gpt-oss-120b Replace Granite 4.2 8B
gpt-oss-120bOpenAI
Coding
No data
Overall
50.0
Output $/M
$0.50
25
Granite 4.2 8BIBM Granite
Coding
No data
Overall
No data
Output $/M
$0.20
2
vs boards won of 27 shared

gpt-oss-120b or Granite 4.2 8B: which to pick

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

Pick gpt-oss-120b for work measured by LMArena Text: expert or LMArena Text: longer queries, where it leads.

Model Agpt-oss-120bOpenAINot benchmarked1 independent benchmark$0.51 per solved taskModel BGranite 4.2 8BIBM GraniteNot benchmarkedNo coding benchmarkNo cost per solved task
Shared results
27
gpt-oss-120b only
58
Granite 4.2 8B only
0
Like-for-like categories
6 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, Granite 4.2 8B not benchmarked.
Widest category
Reasoning, 8.0 points apart on average over 5 shared benchmarks.
Widest single gap
GPQA Diamond (Artificial Analysis run): gpt-oss-120b 78.2% against Granite 4.2 8B 63.1%, 15.1 points apart on a 0 to 100 scale.
Output price
gpt-oss-120b $0.50 against Granite 4.2 8B $0.20 per million output tokens, 2.5x 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-120bBarsGranite 4.2 8BTies
Coding40
Intelligence10
Agentic work10
Reasoning41
Knowledge40
General111
All shared boards252
CodingLike-for-likeSix of these boards feed the Vibe Coding Index40
Coding benchmarks for gpt-oss-120b and Granite 4.2 8B
Benchmarkgpt-oss-120bGranite 4.2 8BLeader
Aider polyglot41.8%Not measuredOnly gpt-oss-120b measured
SWE-bench Verified26.0%Not measuredOnly gpt-oss-120b measured
AA Coding Index30.422.4gpt-oss-120b
LiveCodeBench (Vals AI)83.2%Not measuredOnly gpt-oss-120b measured
SWE-bench Verified (Vals AI)33.6%Not measuredOnly gpt-oss-120b measured
LiveCodeBench (Artificial Analysis run)87.8%Not measuredOnly gpt-oss-120b measured
SciCode34.0%31.5%gpt-oss-120b
Terminal-Bench Hard (Artificial Analysis run)23.5%Not measuredOnly gpt-oss-120b measured
Terminal-Bench18.7%Not measuredOnly gpt-oss-120b measured
WeirdML48.2%Not measuredOnly gpt-oss-120b measured
ALE-Bench575.6Not measuredOnly gpt-oss-120b measured
LMArena Text: coding13791378gpt-oss-120b
LMArena Text: software and IT13871367gpt-oss-120b
SciCode7.7%Not measuredOnly 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 gpt-oss-120b and Granite 4.2 8B
Benchmarkgpt-oss-120bGranite 4.2 8BLeader
AA Intelligence Index11.611.1gpt-oss-120b
Epoch Capabilities Index139.8Not measuredOnly gpt-oss-120b measured
Agentic workLike-for-likePublic boards, shown as published, kept out of the index10
Agentic work benchmarks for gpt-oss-120b and Granite 4.2 8B
Benchmarkgpt-oss-120bGranite 4.2 8BLeader
AA Agentic Index3.71.3gpt-oss-120b
τ²-Bench Telecom65.8%Not measuredOnly gpt-oss-120b measured
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 36 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index41
Reasoning benchmarks for gpt-oss-120b and Granite 4.2 8B
Benchmarkgpt-oss-120bGranite 4.2 8BLeader
GPQA Diamond78.5%Not measuredOnly gpt-oss-120b measured
GPQA Diamond (Artificial Analysis run)78.2%63.1%gpt-oss-120b
Humanity's Last Exam (Artificial Analysis run)19.6%9.7%gpt-oss-120b
GPQA Diamond (Epoch AI run)75.8%Not measuredOnly gpt-oss-120b measured
SimpleBench22.1%Not measuredOnly gpt-oss-120b measured
Mystery game puzzles2.0%Not measuredOnly gpt-oss-120b measured
LMArena Text: hard prompts13641327gpt-oss-120b
LMArena Text: expert13561386Granite 4.2 8B
LMArena Text: hard prompts in English13681345gpt-oss-120b
Kagi LLM Benchmark58.6%Not measuredOnly gpt-oss-120b measured
Neither model has a result on the other 13 boards here
MathDirectional onlyPublic boards, shown as published, kept out of the index9 boards, none shared
Math benchmarks for gpt-oss-120b and Granite 4.2 8B
Benchmarkgpt-oss-120bGranite 4.2 8BLeader
AIME92.6%Not measuredOnly gpt-oss-120b measured
MATH 500 (Vals AI)94.8%Not measuredOnly gpt-oss-120b measured
MGSM (Vals AI)92.0%Not measuredOnly gpt-oss-120b measured
AA Math Index93.4Not measuredOnly gpt-oss-120b measured
AIME 2025 (Artificial Analysis run)93.4%Not measuredOnly gpt-oss-120b measured
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
MathArena15.1%Not 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 index40
Knowledge benchmarks for gpt-oss-120b and Granite 4.2 8B
Benchmarkgpt-oss-120bGranite 4.2 8BLeader
MMLU Pro79.2%Not measuredOnly gpt-oss-120b measured
LegalBench (Vals AI)75.9%Not measuredOnly gpt-oss-120b measured
CaseLaw (Vals AI)48.8%Not measuredOnly gpt-oss-120b measured
CorpFin (Vals AI)58.2%Not measuredOnly gpt-oss-120b measured
TaxEval (Vals AI)71.6%Not measuredOnly gpt-oss-120b measured
MedQA (Vals AI)91.4%Not measuredOnly gpt-oss-120b measured
MMLU Pro (Artificial Analysis run)80.8%Not measuredOnly gpt-oss-120b measured
LMArena Text: science13821336gpt-oss-120b
LMArena Text: medicine and healthcare13881336gpt-oss-120b
LMArena Text: legal and government13551327gpt-oss-120b
LMArena Text: business and finance13591322gpt-oss-120b
PRBench Finance43.8%Not measuredOnly gpt-oss-120b measured
PRBench Legal40.2%Not measuredOnly gpt-oss-120b measured
Neither model has a result on the other 7 boards here
Web designDirectional onlyPublic boards, shown as published, kept out of the index6 boards, none shared
Web design benchmarks for gpt-oss-120b and Granite 4.2 8B
Benchmarkgpt-oss-120bGranite 4.2 8BLeader
Design Arena: websites968Not measuredOnly gpt-oss-120b measured
Design Arena: UI components924Not measuredOnly gpt-oss-120b measured
Design Arena: game dev991Not measuredOnly gpt-oss-120b measured
Design Arena: data viz987Not measuredOnly gpt-oss-120b measured
Design Arena: 3D901Not measuredOnly gpt-oss-120b measured
Design Arena: all code categories962Not measuredOnly gpt-oss-120b measured
Neither model has a result on the other 3 boards here
GeneralLike-for-likePublic boards, shown as published, kept out of the index111
General benchmarks for gpt-oss-120b and Granite 4.2 8B
Benchmarkgpt-oss-120bGranite 4.2 8BLeader
IFBench69.0%Not measuredOnly gpt-oss-120b measured
Long context reasoning (AA-LCR)52.0%45.0%gpt-oss-120b
DTBench76.3%Not measuredOnly gpt-oss-120b measured
LMCA22.1%Not measuredOnly gpt-oss-120b measured
Fiction.LiveBench44.4%Not measuredOnly gpt-oss-120b measured
Creative writing (Lech Mazur)77.1%Not measuredOnly gpt-oss-120b measured
Surface Evolver Bench25.0%Not measuredOnly gpt-oss-120b measured
LMArena Text13661319gpt-oss-120b
LMArena Text: instruction following13181300gpt-oss-120b
LMArena Text: creative writing12741236gpt-oss-120b
LMArena Text: English13751337gpt-oss-120b
LMArena Text: non-English13511301gpt-oss-120b
LMArena Text: Chinese13851367gpt-oss-120b
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: Russian13431282gpt-oss-120b
LMArena Text: Polish1353Not measuredOnly gpt-oss-120b measured
LMArena Text: multi-turn13401301gpt-oss-120b
LMArena Text: longer queries13191325Granite 4.2 8B
LMArena Text: writing and language13061269gpt-oss-120b
LMArena Text: entertainment and media12921271gpt-oss-120b
MultiChallenge45.3%Not measuredOnly 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 gpt-oss-120b and Granite 4.2 8B
Benchmarkgpt-oss-120bGranite 4.2 8BLeader
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
Granite 4.2 8B$0.0002Fits in one request

Granite 4.2 8B costs less

Repository review

50K input + 3K output tokens

gpt-oss-120b$0.0065Fits in one request
Granite 4.2 8B$0.0046Fits in one request

Granite 4.2 8B costs less

Agent loop

200K input + 10K output tokens

gpt-oss-120b$0.025Exceeds the context window
Granite 4.2 8B$0.018Exceeds the context window

Granite 4.2 8B 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 Granite 4.2 8B
SpecificationOpenAI gpt-oss-120bIBM Granite 4.2 8B
MakerOpenAIIBM Granite
WeightsOpen weightsOpen weights
ReleasedAugust 5, 2025August 31, 2026
Context window131K131K
Input $/Mtok$0.10$0.08
Output $/Mtok$0.50$0.20
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 Granite 4.2 8B for coding?

Neither model has a coding score yet, so the two cannot be ranked on coding. Pick gpt-oss-120b for work measured by LMArena Text: expert or LMArena Text: longer queries, where it leads.

Which is cheaper, gpt-oss-120b or Granite 4.2 8B?

gpt-oss-120b costs $0.10 per million input tokens and $0.50 per million output tokens; Granite 4.2 8B costs $0.08 and $0.20. Cost per solved task is known for gpt-oss-120b only.

Which has the bigger context window, gpt-oss-120b or Granite 4.2 8B?

Neither: both take 131K tokens.

How many benchmarks is the gpt-oss-120b vs Granite 4.2 8B comparison based on?

27 benchmarks have a result for both models as of October 22, 2026. gpt-oss-120b's coding index rests on 1 independent benchmark and Granite 4.2 8B's on 0. Where only one model has a result, the page says so instead of naming a winner.

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