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GPT-4.1 Nano vs Solar Pro 4

Solar Pro 4 leads GPT-4.1 Nano on the Artificial Analysis Intelligence Index, 28.2 to 7.8, and GPT-4.1 Nano costs 1.5x less per output token ($0.40 vs $0.60 per million). Updated October 22, 2026; 35 benchmarks have a result for both.

Replace GPT-4.1 Nano Replace Solar Pro 4
GPT-4.1 NanoOpenAI
Coding
No data
Overall
24.7
Output $/M
$0.40
0
Solar Pro 4Upstage
Coding
No data
Overall
No data
Output $/M
$0.60
35
vs boards won of 35 shared

GPT-4.1 Nano or Solar Pro 4: which to pick

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

Pick GPT-4.1 Nano for output tokens 1.5x cheaper ($0.40 vs $0.60 per million) and a larger context window (1.05M against 524K tokens).

Model AGPT-4.1 NanoOpenAINot benchmarkedNo coding benchmarkNo cost per solved taskModel BSolar Pro 4UpstageNot benchmarked1 independent benchmarkNo cost per solved task
Shared results
35
GPT-4.1 Nano only
36
Solar Pro 4 only
10
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-4.1 Nano not benchmarked, Solar Pro 4 not benchmarked.
Widest category
Web design, 29.1 points apart on average over 6 shared benchmarks.
Widest single gap
Long context reasoning (AA-LCR): GPT-4.1 Nano 20.3% against Solar Pro 4 70.7%, 50.3 points apart on a 0 to 100 scale.
Output price
GPT-4.1 Nano $0.40 against Solar Pro 4 $0.60 per million output tokens, 1.5x apart.
Context window
GPT-4.1 Nano takes 1.05M 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-4.1 NanoBarsSolar Pro 4Ties
Coding03
Intelligence01
Reasoning05
Math02
Knowledge04
Web design06
General014
All shared boards035
CodingLike-for-likeSix of these boards feed the Vibe Coding Index03
Coding benchmarks for GPT-4.1 Nano and Solar Pro 4
BenchmarkGPT-4.1 NanoSolar Pro 4Leader
Aider polyglot8.9%Not measuredOnly GPT-4.1 Nano measured
LMArena WebDevNot measured1371Only Solar Pro 4 measured
AA Coding Index11.152.7Solar Pro 4
LiveCodeBench (Vals AI)42.7%Not measuredOnly GPT-4.1 Nano measured
LiveCodeBench (Artificial Analysis run)32.6%Not measuredOnly GPT-4.1 Nano measured
SciCodeNot measured48.0%Only Solar Pro 4 measured
Terminal-Bench Hard (Artificial Analysis run)3.8%Not measuredOnly GPT-4.1 Nano measured
WeirdML19.0%Not measuredOnly GPT-4.1 Nano measured
ALE-BenchNot measured179.3Only Solar Pro 4 measured
LMArena Text: coding13061438Solar Pro 4
LMArena Text: software and IT13051431Solar Pro 4
LMArena WebDev: ReactNot measured1363Only Solar Pro 4 measured
LMArena WebDev: HTMLNot measured1371Only Solar Pro 4 measured
Neither model has a result on the other 26 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index01
Intelligence benchmarks for GPT-4.1 Nano and Solar Pro 4
BenchmarkGPT-4.1 NanoSolar Pro 4Leader
AA Intelligence Index7.828.2Solar Pro 4
Epoch Capabilities Index129.5Not measuredOnly GPT-4.1 Nano measured
Agentic workDirectional onlyPublic boards, shown as published, kept out of the index3 boards, none shared
Agentic work benchmarks for GPT-4.1 Nano and Solar Pro 4
BenchmarkGPT-4.1 NanoSolar Pro 4Leader
Design Arena: agents building web appsNot measured1105Only Solar Pro 4 measured
τ²-Bench Telecom17.3%Not measuredOnly GPT-4.1 Nano measured
Berkeley Function Calling Leaderboard (BFCL)33.1%Not measuredOnly GPT-4.1 Nano measured
Neither model has a result on the other 38 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index05
Reasoning benchmarks for GPT-4.1 Nano and Solar Pro 4
BenchmarkGPT-4.1 NanoSolar Pro 4Leader
GPQA Diamond50.8%Not measuredOnly GPT-4.1 Nano measured
MMMU Pro (Vals AI)55.0%Not measuredOnly GPT-4.1 Nano measured
GPQA Diamond (Artificial Analysis run)51.2%89.1%Solar Pro 4
Humanity's Last Exam (Artificial Analysis run)3.8%29.8%Solar Pro 4
GPQA Diamond (Epoch AI run)48.9%Not measuredOnly GPT-4.1 Nano measured
ARC-AGI0.0%Not measuredOnly GPT-4.1 Nano measured
ARC-AGI-20.0%Not measuredOnly GPT-4.1 Nano measured
Chess puzzles0.0%Not measuredOnly GPT-4.1 Nano measured
LMArena Text: hard prompts12861400Solar Pro 4
LMArena Text: expert12711428Solar Pro 4
LMArena Text: hard prompts in English12931427Solar Pro 4
Kagi LLM Benchmark33.3%Not measuredOnly GPT-4.1 Nano measured
Neither model has a result on the other 10 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index02
Math benchmarks for GPT-4.1 Nano and Solar Pro 4
BenchmarkGPT-4.1 NanoSolar Pro 4Leader
AIME26.5%Not measuredOnly GPT-4.1 Nano measured
MATH 500 (Vals AI)80.2%Not measuredOnly GPT-4.1 Nano measured
MGSM (Vals AI)69.3%Not measuredOnly GPT-4.1 Nano measured
AA Math Index24.0Not measuredOnly GPT-4.1 Nano measured
AIME 2025 (Artificial Analysis run)24.0%Not measuredOnly GPT-4.1 Nano measured
OTIS Mock AIME28.9%Not measuredOnly GPT-4.1 Nano measured
MATH level 570.0%Not measuredOnly GPT-4.1 Nano measured
LMArena Text: math12741421Solar Pro 4
LMArena Text: mathematical work12741427Solar Pro 4
Neither model has a result on the other 4 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index04
Knowledge benchmarks for GPT-4.1 Nano and Solar Pro 4
BenchmarkGPT-4.1 NanoSolar Pro 4Leader
MMLU Pro63.5%Not measuredOnly GPT-4.1 Nano measured
LegalBench (Vals AI)61.1%Not measuredOnly GPT-4.1 Nano measured
CorpFin (Vals AI)42.1%Not measuredOnly GPT-4.1 Nano measured
TaxEval (Vals AI)60.8%Not measuredOnly GPT-4.1 Nano measured
MortgageTax (Vals AI)52.8%Not measuredOnly GPT-4.1 Nano measured
MedQA (Vals AI)68.2%Not measuredOnly GPT-4.1 Nano measured
MMLU Pro (Artificial Analysis run)65.7%Not measuredOnly GPT-4.1 Nano measured
SimpleQA Verified6.0%Not measuredOnly GPT-4.1 Nano measured
LMArena Text: science12971404Solar Pro 4
LMArena Text: medicine and healthcare12761374Solar Pro 4
LMArena Text: legal and government13001383Solar Pro 4
LMArena Text: business and finance12671381Solar Pro 4
Neither model has a result on the other 6 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index06
Web design benchmarks for GPT-4.1 Nano and Solar Pro 4
BenchmarkGPT-4.1 NanoSolar Pro 4Leader
Design Arena: websites9721176Solar Pro 4
Design Arena: UI components9131147Solar Pro 4
Design Arena: game dev9701169Solar Pro 4
Design Arena: data viz8911177Solar Pro 4
Design Arena: 3D9241178Solar 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 index014
General benchmarks for GPT-4.1 Nano and Solar Pro 4
BenchmarkGPT-4.1 NanoSolar Pro 4Leader
IFBench32.0%Not measuredOnly GPT-4.1 Nano measured
Long context reasoning (AA-LCR)20.3%70.7%Solar Pro 4
DTBench52.5%Not measuredOnly GPT-4.1 Nano measured
LMCA5.5%Not measuredOnly GPT-4.1 Nano measured
Fiction.LiveBench25.0%Not measuredOnly GPT-4.1 Nano measured
LMArena Text12851388Solar Pro 4
LMArena Text: instruction following12661375Solar Pro 4
LMArena Text: creative writing12601317Solar Pro 4
LMArena Vision1063Not measuredOnly GPT-4.1 Nano measured
LMArena Text: English13031414Solar Pro 4
LMArena Text: non-English12601363Solar Pro 4
LMArena Text: Chinese12701422Solar Pro 4
LMArena Text: German12881358Solar Pro 4
LMArena Text: Japanese11981320Solar Pro 4
LMArena Text: KoreanNot measured1383Only Solar Pro 4 measured
LMArena Text: FrenchNot measured1400Only Solar Pro 4 measured
LMArena Text: SpanishNot measured1409Only Solar Pro 4 measured
LMArena Text: Russian12611357Solar Pro 4
LMArena Text: PolishNot measured1304Only Solar Pro 4 measured
LMArena Text: multi-turn12771385Solar Pro 4
LMArena Text: longer queries12831382Solar Pro 4
LMArena Text: writing and language12611344Solar Pro 4
LMArena Text: entertainment and media12431332Solar Pro 4
LMArena Vision: English1101Not measuredOnly GPT-4.1 Nano measured
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-4.1 Nano and Solar Pro 4
BenchmarkGPT-4.1 NanoSolar 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-4.1 Nano$0.0003Fits in one request
Solar Pro 4$0.0004Fits in one request

GPT-4.1 Nano costs less

Repository review

50K input + 3K output tokens

GPT-4.1 Nano$0.0062Fits in one request
Solar Pro 4$0.0093Fits in one request

GPT-4.1 Nano costs less

Agent loop

200K input + 10K output tokens

GPT-4.1 Nano$0.024Fits in one request
Solar Pro 4$0.036Fits in one request

GPT-4.1 Nano 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-4.1 Nano and Solar Pro 4
SpecificationOpenAI GPT-4.1 NanoUpstage Solar Pro 4
MakerOpenAIUpstage
WeightsNo public weights listedNo public weights listed
ReleasedApril 14, 2025August 10, 2026
Context window1.05M524K
Input $/Mtok$0.10$0.15
Output $/Mtok$0.40$0.60
Coding indexNot benchmarkedNot benchmarked
Independent measurements behind it01
Cost per solved taskNot computableNot computable
SourceOpenRouter listingOpenRouter listing

Questions

Is GPT-4.1 Nano better than Solar Pro 4 for coding?

Neither model has a coding score yet, so the two cannot be ranked on coding. Pick GPT-4.1 Nano for output tokens 1.5x cheaper ($0.40 vs $0.60 per million) and a larger context window (1.05M against 524K tokens).

Which is cheaper, GPT-4.1 Nano or Solar Pro 4?

GPT-4.1 Nano costs $0.10 per million input tokens and $0.40 per million output tokens; Solar Pro 4 costs $0.15 and $0.60. Cost per solved task is known for neither of them.

Which has the bigger context window, GPT-4.1 Nano or Solar Pro 4?

GPT-4.1 Nano, with 1.05M tokens against 524K.

How many benchmarks is the GPT-4.1 Nano vs Solar Pro 4 comparison based on?

35 benchmarks have a result for both models as of October 22, 2026. GPT-4.1 Nano's coding index rests on 0 independent benchmarks 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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