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Claude Sonnet 4.6 vs gpt-oss-120b

Claude Sonnet 4.6 leads gpt-oss-120b on the Artificial Analysis Intelligence Index, 30.1 to 11.6, and gpt-oss-120b costs 30.0x less per output token ($0.50 vs $15.00 per million). Updated October 22, 2026; 64 benchmarks have a result for both.

Replace Claude Sonnet 4.6 Replace gpt-oss-120b
Claude Sonnet 4.6Anthropic
Coding
57.3
Overall
60.3
Output $/M
$15.00
60
gpt-oss-120bOpenAI
Coding
No data
Overall
50.0
Output $/M
$0.50
4
vs boards won of 64 shared

Claude Sonnet 4.6 or gpt-oss-120b: which to pick

Only Claude Sonnet 4.6 has a coding score, 57.3 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 30.0x cheaper ($0.50 vs $15.00 per million) and a lower cost per solved task ($0.51 against $1.68).

Model AClaude Sonnet 4.6Anthropic57.3/1005 independent benchmarks$1.68 per solved taskModel Bgpt-oss-120bOpenAINot benchmarked1 independent benchmark$0.51 per solved task
Shared results
64
Claude Sonnet 4.6 only
54
gpt-oss-120b only
17
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
Claude Sonnet 4.6 57.3 from 5 benchmarks, gpt-oss-120b not benchmarked.
Widest category
Web design, 38.9 points apart on average over 6 shared benchmarks.
Widest single gap
Vending-Bench 2: Claude Sonnet 4.6 $7,204 against gpt-oss-120b -$22, 45.0 points apart on a 0 to 100 scale.
Output price
Claude Sonnet 4.6 $15.00 against gpt-oss-120b $0.50 per million output tokens, 30.0x apart.
Context window
Claude Sonnet 4.6 takes 1M 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
CategoryClaude Sonnet 4.6Barsgpt-oss-120bTies
Coding81
Intelligence20
Agentic work40
Reasoning80
Math22
Knowledge100
Web design60
General201
All shared boards604
CodingLike-for-likeSix of these boards feed the Vibe Coding Index81
Coding benchmarks for Claude Sonnet 4.6 and gpt-oss-120b
BenchmarkClaude Sonnet 4.6gpt-oss-120bLeader
Aider polyglotNot measured41.8%Only gpt-oss-120b measured
SWE-bench VerifiedNot measured26.0%Only gpt-oss-120b measured
LiveBench coding66.6%Not measuredOnly Claude Sonnet 4.6 measured
LMArena WebDev1523Not measuredOnly Claude Sonnet 4.6 measured
AA Coding Index63.030.4Claude Sonnet 4.6
LiveCodeBench (Vals AI)82.1%83.2%gpt-oss-120b
SWE-bench Verified (Vals AI)77.4%33.6%Claude Sonnet 4.6
Vibe Code Bench (Vals AI)55.8%Not measuredOnly Claude Sonnet 4.6 measured
Code migration (Vals AI)39.9%Not measuredOnly Claude Sonnet 4.6 measured
ProgramBench (Vals AI)0.5%Not measuredOnly Claude Sonnet 4.6 measured
Terminal-Bench 2.1 (Vals AI)57.3%Not measuredOnly Claude Sonnet 4.6 measured
SkillsBench (Vals AI)49.0%Not measuredOnly Claude Sonnet 4.6 measured
LiveCodeBench (Artificial Analysis run)Not measured87.8%Only gpt-oss-120b measured
SciCode50.1%34.0%Claude Sonnet 4.6
Terminal-Bench Hard (Artificial Analysis run)53.0%23.5%Claude Sonnet 4.6
Terminal-Bench53.4%18.7%Claude Sonnet 4.6
FrontierCode24.3%Not measuredOnly Claude Sonnet 4.6 measured
WeirdML66.1%48.2%Claude Sonnet 4.6
ALE-BenchNot measured575.6Only gpt-oss-120b measured
LMArena Text: coding15031379Claude Sonnet 4.6
LMArena Text: software and IT14911387Claude Sonnet 4.6
LMArena WebDev: React1512Not measuredOnly Claude Sonnet 4.6 measured
LMArena WebDev: HTML1527Not measuredOnly Claude Sonnet 4.6 measured
LMArena WebDev: from an image1529Not measuredOnly Claude Sonnet 4.6 measured
SciCodeNot measured7.7%Only gpt-oss-120b measured
Neither model has a result on the other 14 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index20
Intelligence benchmarks for Claude Sonnet 4.6 and gpt-oss-120b
BenchmarkClaude Sonnet 4.6gpt-oss-120bLeader
AA Intelligence Index30.111.6Claude Sonnet 4.6
Epoch Capabilities Index152.8139.8Claude Sonnet 4.6
Agentic workLike-for-likePublic boards, shown as published, kept out of the index40
Agentic work benchmarks for Claude Sonnet 4.6 and gpt-oss-120b
BenchmarkClaude Sonnet 4.6gpt-oss-120bLeader
AA Agentic Index31.83.7Claude Sonnet 4.6
Design Arena: agents building web apps1190Not measuredOnly Claude Sonnet 4.6 measured
Design Arena: agents building full-stack apps1213Not measuredOnly Claude Sonnet 4.6 measured
Design Arena: agents building mobile apps1212Not measuredOnly Claude Sonnet 4.6 measured
Design Arena: agents building Android apps1197Not measuredOnly Claude Sonnet 4.6 measured
Design Arena: agents building Godot games1226Not measuredOnly Claude Sonnet 4.6 measured
Design Arena: agents building games1177Not measuredOnly Claude Sonnet 4.6 measured
LiveBench research63.6%Not measuredOnly Claude Sonnet 4.6 measured
LiveBench browser68.0%Not measuredOnly Claude Sonnet 4.6 measured
LiveBench long agentic23.1%Not measuredOnly Claude Sonnet 4.6 measured
Finance Agent (Vals AI)51.0%Not measuredOnly Claude Sonnet 4.6 measured
Tax Agent Bench (Vals AI)25.8%Not measuredOnly Claude Sonnet 4.6 measured
Legal Research Bench (Vals AI)38.5%Not measuredOnly Claude Sonnet 4.6 measured
Excel Modeling Benchmark (Vals AI)60.2%Not measuredOnly Claude Sonnet 4.6 measured
τ²-Bench Telecom79.5%65.8%Claude Sonnet 4.6
APEX-Agents43.0%4.4%Claude Sonnet 4.6
METR time horizonsNot measured56.6%Only gpt-oss-120b measured
OSWorld 2.09.3%Not measuredOnly Claude Sonnet 4.6 measured
DeepResearch Bench54.9%Not measuredOnly Claude Sonnet 4.6 measured
OSWorld72.1%Not measuredOnly Claude Sonnet 4.6 measured
Vending-Bench 2$7,204-$22Claude Sonnet 4.6
BrowseComp-PlusNot measured67.0%Only gpt-oss-120b measured
Neither model has a result on the other 19 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index80
Reasoning benchmarks for Claude Sonnet 4.6 and gpt-oss-120b
BenchmarkClaude Sonnet 4.6gpt-oss-120bLeader
GPQA Diamond85.6%78.5%Claude Sonnet 4.6
LiveBench reasoning86.4%Not measuredOnly Claude Sonnet 4.6 measured
MMMU Pro (Vals AI)83.6%Not measuredOnly Claude Sonnet 4.6 measured
GPQA Diamond (Artificial Analysis run)87.5%78.2%Claude Sonnet 4.6
Humanity's Last Exam (Artificial Analysis run)33.6%19.6%Claude Sonnet 4.6
GPQA Diamond (Epoch AI run)87.4%75.8%Claude Sonnet 4.6
ARC-AGI86.5%Not measuredOnly Claude Sonnet 4.6 measured
ARC-AGI-260.4%Not measuredOnly Claude Sonnet 4.6 measured
SimpleBenchNot measured22.1%Only gpt-oss-120b measured
Chess puzzles23.0%Not measuredOnly Claude Sonnet 4.6 measured
Mystery game puzzles16.0%2.0%Claude Sonnet 4.6
LMArena Text: hard prompts14851364Claude Sonnet 4.6
LMArena Text: expert15001356Claude Sonnet 4.6
LMArena Text: hard prompts in English14931368Claude Sonnet 4.6
LMArena Vision: diagrams1306Not measuredOnly Claude Sonnet 4.6 measured
LMArena Vision: homework1311Not measuredOnly Claude Sonnet 4.6 measured
Kagi LLM BenchmarkNot measured58.6%Only gpt-oss-120b measured
Neither model has a result on the other 5 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index22
Math benchmarks for Claude Sonnet 4.6 and gpt-oss-120b
BenchmarkClaude Sonnet 4.6gpt-oss-120bLeader
AIME92.3%92.6%gpt-oss-120b
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 IndexNot measured93.4Only gpt-oss-120b measured
AIME 2025 (Artificial Analysis run)Not measured93.4%Only gpt-oss-120b measured
OTIS Mock AIME85.8%88.9%gpt-oss-120b
ProofBench45.0%Not measuredOnly Claude Sonnet 4.6 measured
LMArena Text: math14621389Claude Sonnet 4.6
LMArena Text: mathematical work14831386Claude Sonnet 4.6
Neither model has a result on the other 4 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index100
Knowledge benchmarks for Claude Sonnet 4.6 and gpt-oss-120b
BenchmarkClaude Sonnet 4.6gpt-oss-120bLeader
MMLU Pro87.3%79.2%Claude Sonnet 4.6
LegalBench (Vals AI)82.1%75.9%Claude Sonnet 4.6
CaseLaw (Vals AI)64.0%48.8%Claude Sonnet 4.6
CorpFin (Vals AI)65.3%58.2%Claude Sonnet 4.6
TaxEval (Vals AI)77.1%71.6%Claude Sonnet 4.6
MortgageTax (Vals AI)67.7%Not measuredOnly Claude Sonnet 4.6 measured
MedQA (Vals AI)92.1%91.4%Claude Sonnet 4.6
MMLU Pro (Artificial Analysis run)Not measured80.8%Only gpt-oss-120b measured
SimpleQA Verified35.5%Not measuredOnly Claude Sonnet 4.6 measured
LMArena Text: science14741382Claude Sonnet 4.6
LMArena Text: medicine and healthcare14511388Claude Sonnet 4.6
LMArena Text: legal and government14701355Claude Sonnet 4.6
LMArena Text: business and finance14641359Claude Sonnet 4.6
FACTS Benchmark Suite37.0%Not measuredOnly Claude Sonnet 4.6 measured
Neither model has a result on the other 4 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index60
Web design benchmarks for Claude Sonnet 4.6 and gpt-oss-120b
BenchmarkClaude Sonnet 4.6gpt-oss-120bLeader
Design Arena: websites1284967Claude Sonnet 4.6
Design Arena: UI components1269924Claude Sonnet 4.6
Design Arena: game dev1258992Claude Sonnet 4.6
Design Arena: data viz1278987Claude Sonnet 4.6
Design Arena: 3D1234901Claude Sonnet 4.6
Design Arena: all code categories1275962Claude Sonnet 4.6
Design Arena: SVG1196Not measuredOnly Claude Sonnet 4.6 measured
Design Arena: ASCII art1235Not measuredOnly Claude Sonnet 4.6 measured
LiveBench design71.8%Not measuredOnly Claude Sonnet 4.6 measured
GeneralLike-for-likePublic boards, shown as published, kept out of the index201
General benchmarks for Claude Sonnet 4.6 and gpt-oss-120b
BenchmarkClaude Sonnet 4.6gpt-oss-120bLeader
LiveBench data analysis76.1%Not measuredOnly Claude Sonnet 4.6 measured
Public Benefits Bench (Vals AI)62.5%Not measuredOnly Claude Sonnet 4.6 measured
SAGE (Vals AI)46.6%Not measuredOnly Claude Sonnet 4.6 measured
Vals Multimodal Index60.6%Not measuredOnly Claude Sonnet 4.6 measured
IFBench56.6%69.0%gpt-oss-120b
Long context reasoning (AA-LCR)80.0%52.0%Claude Sonnet 4.6
DTBench89.9%76.3%Claude Sonnet 4.6
LMCA46.5%22.1%Claude Sonnet 4.6
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
ExploitBench23.6%Not measuredOnly Claude Sonnet 4.6 measured
LMArena Text14581366Claude Sonnet 4.6
LMArena Text: instruction following14761318Claude Sonnet 4.6
LMArena Text: creative writing14351274Claude Sonnet 4.6
LMArena Vision1283Not measuredOnly Claude Sonnet 4.6 measured
LMArena Text: English14721375Claude Sonnet 4.6
LMArena Text: non-English14401351Claude Sonnet 4.6
LMArena Text: Chinese14911385Claude Sonnet 4.6
LMArena Text: German14281353Claude Sonnet 4.6
LMArena Text: Japanese14201331Claude Sonnet 4.6
LMArena Text: Korean14101282Claude Sonnet 4.6
LMArena Text: French14651370Claude Sonnet 4.6
LMArena Text: Spanish14641389Claude Sonnet 4.6
LMArena Text: Russian14401343Claude Sonnet 4.6
LMArena Text: Polish14431353Claude Sonnet 4.6
LMArena Text: multi-turn14641340Claude Sonnet 4.6
LMArena Text: longer queries14791319Claude Sonnet 4.6
LMArena Text: writing and language14441306Claude Sonnet 4.6
LMArena Text: entertainment and media14311292Claude Sonnet 4.6
LMArena Vision: English1298Not measuredOnly Claude Sonnet 4.6 measured
LMArena Vision: Chinese1307Not measuredOnly Claude Sonnet 4.6 measured
LMArena Vision: reading text1296Not measuredOnly Claude Sonnet 4.6 measured
LMArena Vision: humor1248Not measuredOnly Claude Sonnet 4.6 measured
LMArena Vision: recognizing things1195Not measuredOnly Claude Sonnet 4.6 measured
LMArena Vision: creative writing1272Not measuredOnly Claude Sonnet 4.6 measured
LMArena Document1482Not measuredOnly Claude Sonnet 4.6 measured
Neither model has a result on the other 9 boards here
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
Image generation benchmarks for Claude Sonnet 4.6 and gpt-oss-120b
BenchmarkClaude Sonnet 4.6gpt-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

Claude Sonnet 4.6$0.011Fits in one request
gpt-oss-120b$0.0003Fits in one request

gpt-oss-120b costs less

Repository review

50K input + 3K output tokens

Claude Sonnet 4.6$0.195Fits in one request
gpt-oss-120b$0.0065Fits in one request

gpt-oss-120b costs less

Agent loop

200K input + 10K output tokens

Claude Sonnet 4.6$0.750Fits in one request
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 Claude Sonnet 4.6 and gpt-oss-120b
SpecificationAnthropic Claude Sonnet 4.6OpenAI gpt-oss-120b
MakerAnthropicOpenAI
WeightsNo public weights listedOpen weights
ReleasedFebruary 17, 2026August 5, 2025
Context window1M131K
Input $/Mtok$3.00$0.10
Output $/Mtok$15.00$0.50
Coding index57.3Not benchmarked
Independent measurements behind it51
Cost per solved task$1.68$0.51
SourceOpenRouter listingOpenRouter listing

Questions

Is Claude Sonnet 4.6 better than gpt-oss-120b for coding?

Only Claude Sonnet 4.6 has a coding score, 57.3 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 30.0x cheaper ($0.50 vs $15.00 per million) and a lower cost per solved task ($0.51 against $1.68).

Which is cheaper, Claude Sonnet 4.6 or gpt-oss-120b?

Claude Sonnet 4.6 costs $3.00 per million input tokens and $15.00 per million output tokens; gpt-oss-120b costs $0.10 and $0.50. Per solved SWE-bench Verified task, Claude Sonnet 4.6 costs $1.68 and gpt-oss-120b $0.51.

Which has the bigger context window, Claude Sonnet 4.6 or gpt-oss-120b?

Claude Sonnet 4.6, with 1M tokens against 131K.

How many benchmarks is the Claude Sonnet 4.6 vs gpt-oss-120b comparison based on?

64 benchmarks have a result for both models as of October 22, 2026. Claude Sonnet 4.6's coding index rests on 5 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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