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gpt-oss-120b vs Grok 4.3

Grok 4.3 leads gpt-oss-120b on the Artificial Analysis Intelligence Index, 24.9 to 11.6, and gpt-oss-120b costs 5.0x less per output token ($0.50 vs $2.50 per million). Updated October 22, 2026; 59 benchmarks have a result for both.

Replace gpt-oss-120b Replace Grok 4.3
gpt-oss-120bOpenAI
Coding
No data
Overall
50.0
Output $/M
$0.50
3
Grok 4.3xAI
Coding
37.4
Overall
53.1
Output $/M
$2.50
56
vs boards won of 59 shared

gpt-oss-120b or Grok 4.3: which to pick

Only Grok 4.3 has a coding score, 37.4 on the Vibe Coding Index; gpt-oss-120b has none, so the two cannot be ranked on coding.

Pick gpt-oss-120b for output tokens 5.0x cheaper ($0.50 vs $2.50 per million) and work measured by LMArena Text: math or TaxEval (Vals AI), where it leads.

Model Agpt-oss-120bOpenAINot benchmarked1 independent benchmark$0.51 per solved taskModel BGrok 4.3xAI37.4/1003 independent benchmarks$0.31 per solved task
Shared results
59
gpt-oss-120b only
22
Grok 4.3 only
46
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, Grok 4.3 37.4 from 3 benchmarks.
Widest category
Web design, 27.4 points apart on average over 6 shared benchmarks.
Widest single gap
SWE-bench Verified (Vals AI): gpt-oss-120b 33.6% against Grok 4.3 71.4%, 37.8 points apart on a 0 to 100 scale.
Output price
gpt-oss-120b $0.50 against Grok 4.3 $2.50 per million output tokens, 5.0x apart.
Context window
gpt-oss-120b takes 131K tokens, Grok 4.3 1M.

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-120bBarsGrok 4.3Ties
Coding09
Intelligence01
Agentic work03
Reasoning07
Math12
Knowledge27
Web design06
General021
All shared boards356
CodingLike-for-likeSix of these boards feed the Vibe Coding Index09
Coding benchmarks for gpt-oss-120b and Grok 4.3
Benchmarkgpt-oss-120bGrok 4.3Leader
Aider polyglot41.8%Not measuredOnly gpt-oss-120b measured
SWE-bench Verified26.0%Not measuredOnly gpt-oss-120b measured
LMArena WebDevNot measured1358Only Grok 4.3 measured
AA Coding Index30.442.2Grok 4.3
LiveCodeBench (Vals AI)83.2%84.5%Grok 4.3
SWE-bench Verified (Vals AI)33.6%71.4%Grok 4.3
Vibe Code Bench (Vals AI)Not measured19.4%Only Grok 4.3 measured
Code migration (Vals AI)Not measured6.8%Only Grok 4.3 measured
ProgramBench (Vals AI)Not measured0.0%Only Grok 4.3 measured
Terminal-Bench 2.1 (Vals AI)Not measured42.0%Only Grok 4.3 measured
SkillsBench (Vals AI)Not measured40.6%Only Grok 4.3 measured
LiveCodeBench (Artificial Analysis run)87.8%Not measuredOnly gpt-oss-120b measured
SciCode34.0%48.3%Grok 4.3
Terminal-Bench Hard (Artificial Analysis run)23.5%37.9%Grok 4.3
Terminal-Bench18.7%Not measuredOnly gpt-oss-120b measured
WeirdML48.2%49.9%Grok 4.3
ALE-Bench575.6944.2Grok 4.3
LMArena Text: coding13791415Grok 4.3
LMArena Text: software and IT13871416Grok 4.3
LMArena WebDev: ReactNot measured1353Only Grok 4.3 measured
LMArena WebDev: HTMLNot measured1367Only Grok 4.3 measured
LMArena WebDev: from an imageNot measured1375Only Grok 4.3 measured
SciCode7.7%Not measuredOnly gpt-oss-120b measured
Neither model has a result on the other 16 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index01
Intelligence benchmarks for gpt-oss-120b and Grok 4.3
Benchmarkgpt-oss-120bGrok 4.3Leader
AA Intelligence Index11.624.9Grok 4.3
Epoch Capabilities Index139.8Not measuredOnly gpt-oss-120b measured
Agentic workLike-for-likePublic boards, shown as published, kept out of the index03
Agentic work benchmarks for gpt-oss-120b and Grok 4.3
Benchmarkgpt-oss-120bGrok 4.3Leader
AA Agentic Index3.715.5Grok 4.3
Design Arena: agents building web appsNot measured1126Only Grok 4.3 measured
Design Arena: agents building full-stack appsNot measured1006Only Grok 4.3 measured
Design Arena: agents building mobile appsNot measured1058Only Grok 4.3 measured
Design Arena: agents building Android appsNot measured962Only Grok 4.3 measured
Design Arena: agents building Godot gamesNot measured914Only Grok 4.3 measured
Design Arena: agents building gamesNot measured1007Only Grok 4.3 measured
Design Arena: HTML slidesNot measured959Only Grok 4.3 measured
Design Arena: PowerPoint slidesNot measured988Only Grok 4.3 measured
Design Arena: spreadsheetsNot measured879Only Grok 4.3 measured
Finance Agent (Vals AI)Not measured37.7%Only Grok 4.3 measured
Tax Agent Bench (Vals AI)Not measured6.2%Only Grok 4.3 measured
Legal Research Bench (Vals AI)Not measured15.4%Only Grok 4.3 measured
Excel Modeling Benchmark (Vals AI)Not measured18.4%Only Grok 4.3 measured
τ²-Bench Telecom65.8%97.7%Grok 4.3
APEX-Agents4.4%Not measuredOnly gpt-oss-120b measured
METR time horizons56.6%Not measuredOnly gpt-oss-120b measured
Vending-Bench 2-$22$35Grok 4.3
LMArena SearchNot measured1166Only Grok 4.3 measured
BrowseComp-Plus67.0%Not measuredOnly gpt-oss-120b measured
Neither model has a result on the other 21 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index07
Reasoning benchmarks for gpt-oss-120b and Grok 4.3
Benchmarkgpt-oss-120bGrok 4.3Leader
GPQA Diamond78.5%91.4%Grok 4.3
MMMU Pro (Vals AI)Not measured83.1%Only Grok 4.3 measured
GPQA Diamond (Artificial Analysis run)78.2%90.1%Grok 4.3
Humanity's Last Exam (Artificial Analysis run)19.6%37.2%Grok 4.3
GPQA Diamond (Epoch AI run)75.8%88.8%Grok 4.3
SimpleBench22.1%Not measuredOnly gpt-oss-120b measured
Chess puzzlesNot measured18.0%Only Grok 4.3 measured
Mystery game puzzles2.0%Not measuredOnly gpt-oss-120b measured
LMArena Text: hard prompts13641396Grok 4.3
LMArena Text: expert13561384Grok 4.3
LMArena Text: hard prompts in English13681402Grok 4.3
LMArena Vision: diagramsNot measured1241Only Grok 4.3 measured
LMArena Vision: homeworkNot measured1241Only Grok 4.3 measured
Kagi LLM Benchmark58.6%Not measuredOnly gpt-oss-120b measured
Neither model has a result on the other 8 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index12
Math benchmarks for gpt-oss-120b and Grok 4.3
Benchmarkgpt-oss-120bGrok 4.3Leader
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%93.3%Grok 4.3
FrontierMath, tiers 1 to 3Not measured42.8%Only Grok 4.3 measured
FrontierMath, tier 4Not measured14.6%Only Grok 4.3 measured
ProofBenchNot measured11.0%Only Grok 4.3 measured
LMArena Text: math13891387gpt-oss-120b
LMArena Text: mathematical work13861396Grok 4.3
Neither model has a result on the other 2 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index27
Knowledge benchmarks for gpt-oss-120b and Grok 4.3
Benchmarkgpt-oss-120bGrok 4.3Leader
MMLU Pro79.2%85.8%Grok 4.3
LegalBench (Vals AI)75.9%84.5%Grok 4.3
CaseLaw (Vals AI)48.8%79.3%Grok 4.3
CorpFin (Vals AI)58.2%68.5%Grok 4.3
TaxEval (Vals AI)71.6%70.8%gpt-oss-120b
MortgageTax (Vals AI)Not measured48.3%Only Grok 4.3 measured
MedQA (Vals AI)91.4%Not measuredOnly gpt-oss-120b measured
MedCode (Vals AI)Not measured38.1%Only Grok 4.3 measured
MMLU Pro (Artificial Analysis run)80.8%Not measuredOnly gpt-oss-120b measured
SimpleQA VerifiedNot measured33.2%Only Grok 4.3 measured
LMArena Text: science13821399Grok 4.3
LMArena Text: medicine and healthcare13881384gpt-oss-120b
LMArena Text: legal and government13551386Grok 4.3
LMArena Text: business and finance13591381Grok 4.3
Neither model has a result on the other 4 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index06
Web design benchmarks for gpt-oss-120b and Grok 4.3
Benchmarkgpt-oss-120bGrok 4.3Leader
Design Arena: websites9671196Grok 4.3
Design Arena: UI components9241190Grok 4.3
Design Arena: game dev9921173Grok 4.3
Design Arena: data viz9871179Grok 4.3
Design Arena: 3D9011124Grok 4.3
Design Arena: all code categories9621186Grok 4.3
Design Arena: SVGNot measured1080Only Grok 4.3 measured
Design Arena: ASCII artNot measured1125Only Grok 4.3 measured
Neither model has a result on the other 1 board here
GeneralLike-for-likePublic boards, shown as published, kept out of the index021
General benchmarks for gpt-oss-120b and Grok 4.3
Benchmarkgpt-oss-120bGrok 4.3Leader
Public Benefits Bench (Vals AI)Not measured51.7%Only Grok 4.3 measured
SAGE (Vals AI)Not measured19.7%Only Grok 4.3 measured
MedScribe (Vals AI)Not measured74.4%Only Grok 4.3 measured
Vals Multimodal IndexNot measured43.3%Only Grok 4.3 measured
IFBench69.0%83.3%Grok 4.3
Long context reasoning (AA-LCR)52.0%75.0%Grok 4.3
DTBench76.3%90.7%Grok 4.3
LMCA22.1%38.3%Grok 4.3
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 Text13661397Grok 4.3
LMArena Text: instruction following13181366Grok 4.3
LMArena Text: creative writing12741380Grok 4.3
LMArena VisionNot measured1229Only Grok 4.3 measured
LMArena Text: English13751404Grok 4.3
LMArena Text: non-English13511385Grok 4.3
LMArena Text: Chinese13851422Grok 4.3
LMArena Text: German13531395Grok 4.3
LMArena Text: Japanese13311379Grok 4.3
LMArena Text: Korean12821354Grok 4.3
LMArena Text: French13701411Grok 4.3
LMArena Text: Spanish13891399Grok 4.3
LMArena Text: Russian13431399Grok 4.3
LMArena Text: Polish13531398Grok 4.3
LMArena Text: multi-turn13401406Grok 4.3
LMArena Text: longer queries13191393Grok 4.3
LMArena Text: writing and language13061385Grok 4.3
LMArena Text: entertainment and media12921370Grok 4.3
LMArena Vision: EnglishNot measured1235Only Grok 4.3 measured
LMArena Vision: ChineseNot measured1257Only Grok 4.3 measured
LMArena Vision: reading textNot measured1235Only Grok 4.3 measured
LMArena Vision: humorNot measured1222Only Grok 4.3 measured
LMArena Vision: recognizing thingsNot measured1217Only Grok 4.3 measured
LMArena Vision: creative writingNot measured1237Only Grok 4.3 measured
Neither model has a result on the other 11 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 Grok 4.3
Benchmarkgpt-oss-120bGrok 4.3Leader
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
Grok 4.3$0.0025Fits in one request

gpt-oss-120b costs less

Repository review

50K input + 3K output tokens

gpt-oss-120b$0.0065Fits in one request
Grok 4.3$0.070Fits in one request

gpt-oss-120b costs less

Agent loop

200K input + 10K output tokens

gpt-oss-120b$0.025Exceeds the context window
Grok 4.3$0.275Fits in one request

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 Grok 4.3
SpecificationOpenAI gpt-oss-120bSpaceXAI Grok 4.3
MakerOpenAIxAI
WeightsOpen weightsNo public weights listed
ReleasedAugust 5, 2025April 30, 2026
Context window131K1M
Input $/Mtok$0.10$1.25
Output $/Mtok$0.50$2.50
Coding indexNot benchmarked37.4
Independent measurements behind it13
Cost per solved task$0.51$0.31
SourceOpenRouter listingOpenRouter listing

Questions

Is gpt-oss-120b better than Grok 4.3 for coding?

Only Grok 4.3 has a coding score, 37.4 on the Vibe Coding Index; gpt-oss-120b has none, so the two cannot be ranked on coding. Pick gpt-oss-120b for output tokens 5.0x cheaper ($0.50 vs $2.50 per million) and work measured by LMArena Text: math or TaxEval (Vals AI), where it leads.

Which is cheaper, gpt-oss-120b or Grok 4.3?

gpt-oss-120b costs $0.10 per million input tokens and $0.50 per million output tokens; Grok 4.3 costs $1.25 and $2.50. Per solved SWE-bench Verified task, gpt-oss-120b costs $0.51 and Grok 4.3 $0.31.

Which has the bigger context window, gpt-oss-120b or Grok 4.3?

Grok 4.3, with 1M tokens against 131K.

How many benchmarks is the gpt-oss-120b vs Grok 4.3 comparison based on?

59 benchmarks have a result for both models as of October 22, 2026. gpt-oss-120b's coding index rests on 1 independent benchmark and Grok 4.3's on 3. Where only one model has a result, the page says so instead of naming a winner.

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