Noometry

Model comparison

Claude Sonnet 5 vs Solar Pro4

Claude Sonnet 5 is the stronger model overall, scoring 54.6 to 42.1 on the Noometry Index. Solar Pro4 costs 7.6× less per token, which makes it the better buy when Claude Sonnet 5's lead doesn't matter for your workload.

Last verified . 18 shared benchmarks.

Claude Sonnet 5 Anthropic

54.6

Rank #29 Confirmed

Solar Pro4 Upstage

42.1

Rank #121 Confirmed

Summary

  • They share 18 benchmarks with published results for both. Claude Sonnet 5 scores higher in 8 categories and Solar Pro4 in 0 categories; 8 gaps are clear of the uncertainty.
  • The widest gap is in math, where Claude Sonnet 5 leads 66.2 to 38.8.
  • Solar Pro4 is cheaper at $0.30 / $1.20 per million input/output tokens, against $2 / $10 for Claude Sonnet 5.
  • Claude Sonnet 5 accepts more context: 1M tokens versus 524K.

Side by side

Claude Sonnet 5Solar Pro4
ProviderAnthropicUpstage
Noometry Index54.642.1
Released2026-06-292026-08-06
WeightsProprietaryProprietary
Context window1M524K
Max output128K131K
Input $ / M tokens$2$0.30
Output $ / M tokens$10$1.20
Results tracked5118

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Category by category

Coding Claude Sonnet 5 leads

Claude Sonnet 5: 55.5 (#26), Solar Pro4: 40.1 (#149)

BenchmarkClaude Sonnet 5Solar Pro4
LMArena WebDev15411371
LMArena Coding14831437
DeepSWE53.8%—
FrontierCode42.7%—
CursorBench34.1%—
SciCode54.3%—
GSO37.3%—
WeirdML68.8%—
ALE-Bench1,463—

Agentic & Tool Use Not comparable

Claude Sonnet 5: 42.8 (#18), Solar Pro4: —

BenchmarkClaude Sonnet 5Solar Pro4
APEX-Agents54.5%—
GBAEval65.3%—
LMArena Search1194—
Vending-Bench 26,378—

Reasoning Claude Sonnet 5 leads

Claude Sonnet 5: 49.1 (#39), Solar Pro4: 28.5 (#104)

BenchmarkClaude Sonnet 5Solar Pro4
LMArena Hard Prompts14611399
SimpleBench60.6%—
NYT Connections (extended)75.1%—
CritPt16.9%—
Chess Puzzles35%—
Mystery Game Puzzles35%—
DTBench92.5%—
LMCA50%—
Surface Evolver Bench60%—
Bench to the Future 30.14—
Epoch Capabilities Index156.21—
ForecastBench61.1—

Math Claude Sonnet 5 leads

Claude Sonnet 5: 66.2 (#27), Solar Pro4: 38.8 (#128)

BenchmarkClaude Sonnet 5Solar Pro4
LMArena Math14671416
FrontierMath (Tiers 1-3)65.6%—
FrontierMath Tier 429.3%—
OTIS Mock AIME 2024-202594.7%—
ProofBench77%—

Knowledge Claude Sonnet 5 leads

Claude Sonnet 5: 55.6 (#47), Solar Pro4: 39.8 (#129)

BenchmarkClaude Sonnet 5Solar Pro4
LMArena Expert14901427
GPQA Diamond90.5%—
SimpleQA Verified33.7%—

Multimodal Not comparable

Claude Sonnet 5: 42.4 (#31), Solar Pro4: —

BenchmarkClaude Sonnet 5Solar Pro4
LMArena Vision1274—
Blueprint-Bench 224.9%—
LMArena Document1466—

Multilingual Claude Sonnet 5 leads

Claude Sonnet 5: 53.8 (#55), Solar Pro4: 48.7 (#139)

BenchmarkClaude Sonnet 5Solar Pro4
LMArena Non-English14311361
LMArena Chinese14771415
LMArena French14601397
LMArena German14401364
LMArena Japanese14221309
LMArena Korean14111382
LMArena Russian14511360
LMArena Spanish14371401

Instruction Following Claude Sonnet 5 leads

Claude Sonnet 5: 76.3 (#41), Solar Pro4: 72.7 (#132)

BenchmarkClaude Sonnet 5Solar Pro4
LMArena Instruction Following14521377

Long Context Claude Sonnet 5 leads

Claude Sonnet 5: 44.8 (#55), Solar Pro4: 42.1 (#130)

BenchmarkClaude Sonnet 5Solar Pro4
LMArena Longer Query14631381

Writing & Preference Claude Sonnet 5 leads

Claude Sonnet 5: 69.2 (#25), Solar Pro4: 56.5 (#138)

BenchmarkClaude Sonnet 5Solar Pro4
LMArena Text14421386
LMArena Creative Writing14161316
LMArena Multi-Turn14541385
EQ-Bench Creative Writing1794—
EQ-Bench 41236—

Frequently asked questions

Is Claude Sonnet 5 better than Solar Pro4?

Claude Sonnet 5 is the stronger model overall, scoring 54.6 to 42.1 on the Noometry Index. Solar Pro4 costs 7.6× less per token, which makes it the better buy when Claude Sonnet 5's lead doesn't matter for your workload.

Which is cheaper, Claude Sonnet 5 or Solar Pro4?

Solar Pro4 is cheaper. It lists at $0.30 per million input tokens and $1.20 per million output tokens; Claude Sonnet 5 lists at $2 and $10.

Is Claude Sonnet 5 or Solar Pro4 better for coding?

Claude Sonnet 5 scores higher on coding benchmarks: 55.5 versus 40.1 in the Noometry coding category.

Which has the bigger context window?

Claude Sonnet 5 does, with 1M tokens against 524K.

How many benchmarks do Claude Sonnet 5 and Solar Pro4 share?

18 benchmarks have published results for both models. Claude Sonnet 5 has 51 scored results on Noometry and Solar Pro4 has 18.

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