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gpt-oss-120b vs Solar Pro 4

Solar Pro 4 leads gpt-oss-120b on the Artificial Analysis Intelligence Index, 28.2 to 11.6, and gpt-oss-120b costs 1.2x less per output token ($0.50 vs $0.60 per million). Updated October 22, 2026; 41 benchmarks have a result for both.

Replace gpt-oss-120b Replace Solar Pro 4
gpt-oss-120bOpenAI
Coding
No data
Overall
50.0
Output $/M
$0.50
4
Solar Pro 4Upstage
Coding
No data
Overall
No data
Output $/M
$0.60
37
vs boards won of 41 shared

gpt-oss-120b or Solar Pro 4: 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 1.2x cheaper ($0.50 vs $0.60 per million) and work measured by AA Coding Index or SciCode, where it leads.

Model Agpt-oss-120bOpenAINot benchmarked1 independent benchmark$0.51 per solved taskModel BSolar Pro 4UpstageNot benchmarked1 independent benchmarkNo cost per solved task
Shared results
41
gpt-oss-120b only
40
Solar Pro 4 only
4
Like-for-like categories
7 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, Solar Pro 4 not benchmarked.
Widest category
Web design, 27.0 points apart on average over 6 shared benchmarks.
Widest single gap
Design Arena: 3D: gpt-oss-120b 901 against Solar Pro 4 1178, 34.6 points apart on a 0 to 100 scale.
Output price
gpt-oss-120b $0.50 against Solar Pro 4 $0.60 per million output tokens, 1.2x apart.
Context window
gpt-oss-120b takes 131K tokens, Solar Pro 4 524K.

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-120bBarsSolar Pro 4Ties
Coding14
Intelligence01
Reasoning05
Math02
Knowledge13
Web design06
General216
All shared boards437
CodingLike-for-likeSix of these boards feed the Vibe Coding Index14
Coding benchmarks for gpt-oss-120b and Solar Pro 4
Benchmarkgpt-oss-120bSolar Pro 4Leader
Aider polyglot41.8%Not measuredOnly gpt-oss-120b measured
SWE-bench Verified26.0%Not measuredOnly gpt-oss-120b measured
LMArena WebDevNot measured1371Only Solar Pro 4 measured
AA Coding Index30.452.7Solar Pro 4
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%48.0%Solar Pro 4
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-Bench575.6179.3gpt-oss-120b
LMArena Text: coding13791438Solar Pro 4
LMArena Text: software and IT13871431Solar Pro 4
LMArena WebDev: ReactNot measured1363Only Solar Pro 4 measured
LMArena WebDev: HTMLNot measured1371Only Solar Pro 4 measured
SciCode7.7%Not measuredOnly gpt-oss-120b measured
Neither model has a result on the other 22 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index01
Intelligence benchmarks for gpt-oss-120b and Solar Pro 4
Benchmarkgpt-oss-120bSolar Pro 4Leader
AA Intelligence Index11.628.2Solar Pro 4
Epoch Capabilities Index139.8Not measuredOnly gpt-oss-120b measured
Agentic workDirectional onlyPublic boards, shown as published, kept out of the index7 boards, none shared
Agentic work benchmarks for gpt-oss-120b and Solar Pro 4
Benchmarkgpt-oss-120bSolar Pro 4Leader
AA Agentic Index3.7Not measuredOnly gpt-oss-120b measured
Design Arena: agents building web appsNot measured1105Only Solar Pro 4 measured
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 34 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index05
Reasoning benchmarks for gpt-oss-120b and Solar Pro 4
Benchmarkgpt-oss-120bSolar Pro 4Leader
GPQA Diamond78.5%Not measuredOnly gpt-oss-120b measured
GPQA Diamond (Artificial Analysis run)78.2%89.1%Solar Pro 4
Humanity's Last Exam (Artificial Analysis run)19.6%29.8%Solar Pro 4
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 prompts13641400Solar Pro 4
LMArena Text: expert13561428Solar Pro 4
LMArena Text: hard prompts in English13681427Solar Pro 4
Kagi LLM Benchmark58.6%Not measuredOnly gpt-oss-120b measured
Neither model has a result on the other 12 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index02
Math benchmarks for gpt-oss-120b and Solar Pro 4
Benchmarkgpt-oss-120bSolar Pro 4Leader
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: math13891421Solar Pro 4
LMArena Text: mathematical work13861427Solar Pro 4
Neither model has a result on the other 5 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index13
Knowledge benchmarks for gpt-oss-120b and Solar Pro 4
Benchmarkgpt-oss-120bSolar Pro 4Leader
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: science13821404Solar Pro 4
LMArena Text: medicine and healthcare13881374gpt-oss-120b
LMArena Text: legal and government13551383Solar Pro 4
LMArena Text: business and finance13591381Solar Pro 4
Neither model has a result on the other 7 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index06
Web design benchmarks for gpt-oss-120b and Solar Pro 4
Benchmarkgpt-oss-120bSolar Pro 4Leader
Design Arena: websites9671176Solar Pro 4
Design Arena: UI components9241147Solar Pro 4
Design Arena: game dev9921169Solar Pro 4
Design Arena: data viz9871177Solar Pro 4
Design Arena: 3D9011178Solar Pro 4
Design Arena: all code categories9621182Solar Pro 4
Neither model has a result on the other 3 boards here
GeneralLike-for-likePublic boards, shown as published, kept out of the index216
General benchmarks for gpt-oss-120b and Solar Pro 4
Benchmarkgpt-oss-120bSolar Pro 4Leader
IFBench69.0%Not measuredOnly gpt-oss-120b measured
Long context reasoning (AA-LCR)52.0%70.7%Solar Pro 4
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 Text13661388Solar Pro 4
LMArena Text: instruction following13181375Solar Pro 4
LMArena Text: creative writing12741317Solar Pro 4
LMArena Text: English13751414Solar Pro 4
LMArena Text: non-English13511363Solar Pro 4
LMArena Text: Chinese13851422Solar Pro 4
LMArena Text: German13531358Solar Pro 4
LMArena Text: Japanese13311320gpt-oss-120b
LMArena Text: Korean12821383Solar Pro 4
LMArena Text: French13701400Solar Pro 4
LMArena Text: Spanish13891409Solar Pro 4
LMArena Text: Russian13431357Solar Pro 4
LMArena Text: Polish13531304gpt-oss-120b
LMArena Text: multi-turn13401385Solar Pro 4
LMArena Text: longer queries13191382Solar Pro 4
LMArena Text: writing and language13061344Solar Pro 4
LMArena Text: entertainment and media12921332Solar Pro 4
Neither model has a result on the other 22 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 Solar Pro 4
Benchmarkgpt-oss-120bSolar Pro 4Leader
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
Solar Pro 4$0.0004Fits in one request

gpt-oss-120b costs less

Repository review

50K input + 3K output tokens

gpt-oss-120b$0.0065Fits in one request
Solar Pro 4$0.0093Fits in one request

gpt-oss-120b costs less

Agent loop

200K input + 10K output tokens

gpt-oss-120b$0.025Exceeds the context window
Solar Pro 4$0.036Fits 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 Solar Pro 4
SpecificationOpenAI gpt-oss-120bUpstage Solar Pro 4
MakerOpenAIUpstage
WeightsOpen weightsNo public weights listed
ReleasedAugust 5, 2025August 10, 2026
Context window131K524K
Input $/Mtok$0.10$0.15
Output $/Mtok$0.50$0.60
Coding indexNot benchmarkedNot benchmarked
Independent measurements behind it11
Cost per solved task$0.51Not computable
SourceOpenRouter listingOpenRouter listing

Questions

Is gpt-oss-120b better than Solar Pro 4 for coding?

Neither model has a coding score yet, so the two cannot be ranked on coding. Pick gpt-oss-120b for output tokens 1.2x cheaper ($0.50 vs $0.60 per million) and work measured by AA Coding Index or SciCode, where it leads.

Which is cheaper, gpt-oss-120b or Solar Pro 4?

gpt-oss-120b costs $0.10 per million input tokens and $0.50 per million output tokens; Solar Pro 4 costs $0.15 and $0.60. Cost per solved task is known for gpt-oss-120b only.

Which has the bigger context window, gpt-oss-120b or Solar Pro 4?

Solar Pro 4, with 524K tokens against 131K.

How many benchmarks is the gpt-oss-120b vs Solar Pro 4 comparison based on?

41 benchmarks have a result for both models as of October 22, 2026. gpt-oss-120b's coding index rests on 1 independent benchmark and Solar Pro 4's on 1. Where only one model has a result, the page says so instead of naming a winner.

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