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Claude Sonnet 4.5 vs Solar Pro 4

Updated October 21, 2026. 40 benchmarks have a result for both. Coding is ranked on the Vibe Coding Index; every other board is shown as published.

Replace Claude Sonnet 4.5 Replace Solar Pro 4
Claude Sonnet 4.5Anthropic
Coding
59.1
Overall
20.7
Output $/M
$15.00
34
Solar Pro 4Upstage
Coding
24.4
Overall
28.2
Output $/M
$0.60
6
vs boards won of 40 shared

Decision reading

Pick Claude Sonnet 4.5 for coding: it scores 59.1 on the Vibe Coding Index against 24.4 for Solar Pro 4.

Pick Solar Pro 4 when output tokens cost 25.0x less, or when what matters is AA Coding Index or AA Intelligence Index, where it leads.

Model AClaude Sonnet 4.5Anthropic59.1/1002 independent benchmarks$1.16 per solved taskModel BSolar Pro 4Upstage24.4/1001 independent benchmarkNo cost per solved task
Shared results
40
Claude Sonnet 4.5 only
52
Solar Pro 4 only
5
Like-for-like categories
8 of 9

Shared results can support a head-to-head reading. Results only one model has describe coverage, not superiority.

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 4.5 59.1 from 2 benchmarks, Solar Pro 4 24.4 from 1 benchmark.
Widest category
General, 12.0 points apart on average over 17 shared benchmarks.
Widest single gap
LMArena Text: creative writing: Claude Sonnet 4.5 1442 against Solar Pro 4 1317, 20.8 points apart on a 0 to 100 scale.
Output price
Claude Sonnet 4.5 $15.00 against Solar Pro 4 $0.60 per million output tokens, 25.0x apart.
Context window
Claude Sonnet 4.5 takes 1M 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
CategoryClaude Sonnet 4.5BarsSolar Pro 4Ties
Coding51
Intelligence01
Agentic work01
Reasoning30
Math20
Knowledge40
Web design33
General170
All shared boards346
CodingLike-for-likeFour of these boards feed the Vibe Coding Index51
Coding benchmarks for Claude Sonnet 4.5 and Solar Pro 4
BenchmarkClaude Sonnet 4.5Solar Pro 4Leader
SWE-bench Verified74.8%Not measuredOnly Claude Sonnet 4.5 measured
SWE-bench Multilingual67.0%Not measuredOnly Claude Sonnet 4.5 measured
LMArena WebDev13941371Claude Sonnet 4.5
AA Coding Index52.152.7Solar Pro 4
LiveCodeBench (Vals AI)73.0%Not measuredOnly Claude Sonnet 4.5 measured
SWE-bench Verified (Vals AI)70.0%Not measuredOnly Claude Sonnet 4.5 measured
Vibe Code Bench (Vals AI)22.6%Not measuredOnly Claude Sonnet 4.5 measured
SciCodeNot measured48.0%Only Solar Pro 4 measured
Terminal-Bench46.5%Not measuredOnly Claude Sonnet 4.5 measured
GSO-Bench14.7%Not measuredOnly Claude Sonnet 4.5 measured
WeirdML47.7%Not measuredOnly Claude Sonnet 4.5 measured
Cybench60.0%Not measuredOnly Claude Sonnet 4.5 measured
ALE-BenchNot measured179.3Only Solar Pro 4 measured
LMArena Text: coding14881438Claude Sonnet 4.5
LMArena Text: software and IT14731431Claude Sonnet 4.5
LMArena WebDev: React13861363Claude Sonnet 4.5
LMArena WebDev: HTML13991371Claude Sonnet 4.5
Neither model has a result on the other 21 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index01
Intelligence benchmarks for Claude Sonnet 4.5 and Solar Pro 4
BenchmarkClaude Sonnet 4.5Solar Pro 4Leader
AA Intelligence Index20.728.2Solar Pro 4
Epoch Capabilities Index146.7Not measuredOnly Claude Sonnet 4.5 measured
Agentic workLike-for-likePublic boards, shown as published, kept out of the index01
Agentic work benchmarks for Claude Sonnet 4.5 and Solar Pro 4
BenchmarkClaude Sonnet 4.5Solar Pro 4Leader
AA Agentic Index15.8Not measuredOnly Claude Sonnet 4.5 measured
Design Arena: agents building web apps10601105Solar Pro 4
Design Arena: agents building full-stack apps1050Not measuredOnly Claude Sonnet 4.5 measured
Design Arena: agents building mobile apps1137Not measuredOnly Claude Sonnet 4.5 measured
METR time horizons67.4%Not measuredOnly Claude Sonnet 4.5 measured
Remote Labor Index2.1%Not measuredOnly Claude Sonnet 4.5 measured
GDPval42.5%Not measuredOnly Claude Sonnet 4.5 measured
DeepResearch Bench52.6%Not measuredOnly Claude Sonnet 4.5 measured
OSWorld62.9%Not measuredOnly Claude Sonnet 4.5 measured
Vending-Bench 2$3,839Not measuredOnly Claude Sonnet 4.5 measured
Neither model has a result on the other 29 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index30
Reasoning benchmarks for Claude Sonnet 4.5 and Solar Pro 4
BenchmarkClaude Sonnet 4.5Solar Pro 4Leader
GPQA Diamond81.6%Not measuredOnly Claude Sonnet 4.5 measured
MMMU Pro (Vals AI)79.3%Not measuredOnly Claude Sonnet 4.5 measured
GPQA Diamond (Artificial Analysis run)Not measured89.1%Only Solar Pro 4 measured
Humanity's Last Exam (Artificial Analysis run)Not measured29.8%Only Solar Pro 4 measured
GPQA Diamond (Epoch AI run)82.3%Not measuredOnly Claude Sonnet 4.5 measured
ARC-AGI63.7%Not measuredOnly Claude Sonnet 4.5 measured
ARC-AGI-213.6%Not measuredOnly Claude Sonnet 4.5 measured
SimpleBench54.3%Not measuredOnly Claude Sonnet 4.5 measured
Chess puzzles10.0%Not measuredOnly Claude Sonnet 4.5 measured
Mystery game puzzles17.0%Not measuredOnly Claude Sonnet 4.5 measured
EBR-bench2.4%Not measuredOnly Claude Sonnet 4.5 measured
VPCT39.8%Not measuredOnly Claude Sonnet 4.5 measured
LMArena Text: hard prompts14621400Claude Sonnet 4.5
LMArena Text: expert14831428Claude Sonnet 4.5
LMArena Text: hard prompts in English14711427Claude Sonnet 4.5
Neither model has a result on the other 6 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index20
Math benchmarks for Claude Sonnet 4.5 and Solar Pro 4
BenchmarkClaude Sonnet 4.5Solar Pro 4Leader
AIME88.2%Not measuredOnly Claude Sonnet 4.5 measured
MGSM (Vals AI)94.3%Not measuredOnly Claude Sonnet 4.5 measured
OTIS Mock AIME77.8%Not measuredOnly Claude Sonnet 4.5 measured
FrontierMath, tiers 1 to 323.9%Not measuredOnly Claude Sonnet 4.5 measured
FrontierMath, tier 42.4%Not measuredOnly Claude Sonnet 4.5 measured
ProofBench19.0%Not measuredOnly Claude Sonnet 4.5 measured
MATH level 597.7%Not measuredOnly Claude Sonnet 4.5 measured
LMArena Text: math14491421Claude Sonnet 4.5
LMArena Text: mathematical work14621427Claude Sonnet 4.5
Neither model has a result on the other 4 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index40
Knowledge benchmarks for Claude Sonnet 4.5 and Solar Pro 4
BenchmarkClaude Sonnet 4.5Solar Pro 4Leader
MMLU Pro87.4%Not measuredOnly Claude Sonnet 4.5 measured
LegalBench (Vals AI)84.1%Not measuredOnly Claude Sonnet 4.5 measured
CaseLaw (Vals AI)62.2%Not measuredOnly Claude Sonnet 4.5 measured
CorpFin (Vals AI)62.0%Not measuredOnly Claude Sonnet 4.5 measured
TaxEval (Vals AI)73.3%Not measuredOnly Claude Sonnet 4.5 measured
MortgageTax (Vals AI)64.0%Not measuredOnly Claude Sonnet 4.5 measured
MedQA (Vals AI)94.7%Not measuredOnly Claude Sonnet 4.5 measured
MedCode (Vals AI)44.1%Not measuredOnly Claude Sonnet 4.5 measured
SimpleQA Verified30.7%Not measuredOnly Claude Sonnet 4.5 measured
LMArena Text: science14481404Claude Sonnet 4.5
LMArena Text: medicine and healthcare14441374Claude Sonnet 4.5
LMArena Text: legal and government14511383Claude Sonnet 4.5
LMArena Text: business and finance14401381Claude Sonnet 4.5
Neither model has a result on the other 4 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index33
Web design benchmarks for Claude Sonnet 4.5 and Solar Pro 4
BenchmarkClaude Sonnet 4.5Solar Pro 4Leader
Design Arena: websites11901176Claude Sonnet 4.5
Design Arena: UI components11731150Claude Sonnet 4.5
Design Arena: game dev11661170Solar Pro 4
Design Arena: data viz11671177Solar Pro 4
Design Arena: 3D11581178Solar Pro 4
Design Arena: all code categories11831182Claude Sonnet 4.5
Design Arena: SVG1114Not measuredOnly Claude Sonnet 4.5 measured
Design Arena: ASCII art1204Not measuredOnly Claude Sonnet 4.5 measured
Neither model has a result on the other 1 board here
GeneralLike-for-likePublic boards, shown as published, kept out of the index170
General benchmarks for Claude Sonnet 4.5 and Solar Pro 4
BenchmarkClaude Sonnet 4.5Solar Pro 4Leader
SAGE (Vals AI)36.1%Not measuredOnly Claude Sonnet 4.5 measured
MedScribe (Vals AI)84.5%Not measuredOnly Claude Sonnet 4.5 measured
Long context reasoning (AA-LCR)Not measured70.7%Only Solar Pro 4 measured
DTBench83.2%Not measuredOnly Claude Sonnet 4.5 measured
LMCA38.8%Not measuredOnly Claude Sonnet 4.5 measured
LMArena Text14381388Claude Sonnet 4.5
LMArena Text: instruction following14591375Claude Sonnet 4.5
LMArena Text: creative writing14421317Claude Sonnet 4.5
LMArena Text: English14501414Claude Sonnet 4.5
LMArena Text: non-English14251363Claude Sonnet 4.5
LMArena Text: Chinese14601422Claude Sonnet 4.5
LMArena Text: German14271358Claude Sonnet 4.5
LMArena Text: Japanese13901320Claude Sonnet 4.5
LMArena Text: Korean14021383Claude Sonnet 4.5
LMArena Text: French14591400Claude Sonnet 4.5
LMArena Text: Spanish14581409Claude Sonnet 4.5
LMArena Text: Russian14371357Claude Sonnet 4.5
LMArena Text: Polish14231304Claude Sonnet 4.5
LMArena Text: multi-turn14651385Claude Sonnet 4.5
LMArena Text: longer queries14751382Claude Sonnet 4.5
LMArena Text: writing and language14421344Claude Sonnet 4.5
LMArena Text: entertainment and media14281332Claude Sonnet 4.5
LMArena Document1450Not measuredOnly Claude Sonnet 4.5 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 Claude Sonnet 4.5 and Solar Pro 4
BenchmarkClaude Sonnet 4.5Solar 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

Claude Sonnet 4.5$0.011Fits in one request
Solar Pro 4$0.0004Fits in one request

Solar Pro 4 costs less

Repository review

50K input + 3K output tokens

Claude Sonnet 4.5$0.195Fits in one request
Solar Pro 4$0.0093Fits in one request

Solar Pro 4 costs less

Agent loop

200K input + 10K output tokens

Claude Sonnet 4.5$0.750Fits in one request
Solar Pro 4$0.036Fits in one request

Solar Pro 4 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 4.5 and Solar Pro 4
SpecificationAnthropic Claude Sonnet 4.5Upstage Solar Pro 4
MakerAnthropicUpstage
WeightsNo public weights listedNo public weights listed
ReleasedSeptember 29, 2025August 10, 2026
Context window1M524K
Input $/Mtok$3.00$0.15
Output $/Mtok$15.00$0.60
Coding index59.124.4
Independent measurements behind it21
Cost per solved task$1.16Not computable
SourceOpenRouter listingOpenRouter listing

Questions

Is Claude Sonnet 4.5 better than Solar Pro 4 for coding?

Pick Claude Sonnet 4.5 for coding: it scores 59.1 on the Vibe Coding Index against 24.4 for Solar Pro 4. Pick Solar Pro 4 when output tokens cost 25.0x less, or when what matters is AA Coding Index or AA Intelligence Index, where it leads.

Which is cheaper, Claude Sonnet 4.5 or Solar Pro 4?

Claude Sonnet 4.5 costs $3.00 per million input tokens and $15.00 per million output tokens; Solar Pro 4 costs $0.15 and $0.60. Cost per solved task is known for Claude Sonnet 4.5 only.

Which has the bigger context window, Claude Sonnet 4.5 or Solar Pro 4?

Claude Sonnet 4.5, with 1M tokens against 524K.

How many benchmarks is the Claude Sonnet 4.5 vs Solar Pro 4 comparison based on?

40 benchmarks have a result for both models as of October 21, 2026. Claude Sonnet 4.5's coding index rests on 2 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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