Noometry

Model comparison

Claude Sonnet 5.5 vs Solar Pro 3

Claude Sonnet 5.5 has enough public results to be ranked (#10); Solar Pro 3 does not yet, so treat this comparison as directional.

Last verified . 2 shared benchmarks.

Claude Sonnet 5.5 Anthropic

61.9

Rank #10 Confirmed

Solar Pro 3 Upstage

33.9

Unranked Sparse

Summary

  • They share 2 benchmarks with published results for both. Claude Sonnet 5.5 scores higher in 2 categories and Solar Pro 3 in 0 categories; 2 gaps are clear of the uncertainty.
  • The widest gap is in coding, where Claude Sonnet 5.5 leads 67.3 to 34.8.
  • The biggest single-benchmark swing is SciCode: 61% for Claude Sonnet 5.5 and 24.7% for Solar Pro 3.
  • Solar Pro 3 is cheaper at $0.25 / $0.25 per million input/output tokens, against $2 / $10 for Claude Sonnet 5.5.
  • Claude Sonnet 5.5 accepts more context: 1M tokens versus 131K.

Side by side

Claude Sonnet 5.5Solar Pro 3
ProviderAnthropicUpstage
Noometry Index61.933.9
Released2026-09-282026-01
WeightsProprietaryProprietary
Context window1M131K
Max output128K8K
Input $ / M tokens$2$0.25
Output $ / M tokens$10$0.25
Results tracked322

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Category by category

Coding Claude Sonnet 5.5 leads

Claude Sonnet 5.5: 67.3 (#6), Solar Pro 3: 34.8

BenchmarkClaude Sonnet 5.5Solar Pro 3
SciCode61%24.7%
FrontierCode52.1%—
CursorBench55.5%—
LMArena WebDev1774—
FrontierSWE61.9%—
LMArena Coding1513—
ALE-Bench1,819—

Agentic & Tool Use Not comparable

Claude Sonnet 5.5: 45.0 (#16), Solar Pro 3: —

BenchmarkClaude Sonnet 5.5Solar Pro 3
APEX-Agents75.5%—

Reasoning Claude Sonnet 5.5 leads

Claude Sonnet 5.5: 54.0 (#28), Solar Pro 3: 22.4

BenchmarkClaude Sonnet 5.5Solar Pro 3
CritPt31.4%0%
NYT Connections (extended)80.5%—
LMArena Hard Prompts1495—
Mystery Game Puzzles65%—
Epoch Capabilities Index165.03—

Math Not comparable

Claude Sonnet 5.5: 87.9 (#6), Solar Pro 3: —

BenchmarkClaude Sonnet 5.5Solar Pro 3
FrontierMath (Tiers 1-3)88.8%—
FrontierMath Tier 480.5%—
OTIS Mock AIME 2024-2025100%—
ProofBench100%—
LMArena Math1510—
FrontierMath Erdős2.9%—

Knowledge Not comparable

Claude Sonnet 5.5: 66.0 (#12), Solar Pro 3: —

BenchmarkClaude Sonnet 5.5Solar Pro 3
GPQA Diamond95.6%—
SimpleQA Verified46.5%—
LMArena Expert1540—

Multimodal Not comparable

Claude Sonnet 5.5: 51.5 (#6), Solar Pro 3: —

BenchmarkClaude Sonnet 5.5Solar Pro 3
LMArena Vision1289—
Furniture Assembly75%—

Multilingual Not comparable

Claude Sonnet 5.5: 55.3 (#30), Solar Pro 3: —

BenchmarkClaude Sonnet 5.5Solar Pro 3
LMArena Non-English1452—
LMArena Chinese1522—
LMArena Russian1451—

Instruction Following Not comparable

Claude Sonnet 5.5: 78.3 (#11), Solar Pro 3: —

BenchmarkClaude Sonnet 5.5Solar Pro 3
LMArena Instruction Following1495—

Long Context Not comparable

Claude Sonnet 5.5: 45.9 (#28), Solar Pro 3: —

BenchmarkClaude Sonnet 5.5Solar Pro 3
LMArena Longer Query1498—

Writing & Preference Not comparable

Claude Sonnet 5.5: 66.0 (#40), Solar Pro 3: —

BenchmarkClaude Sonnet 5.5Solar Pro 3
LMArena Text1471—
LMArena Creative Writing1465—
LMArena Multi-Turn1474—

Frequently asked questions

Is Claude Sonnet 5.5 better than Solar Pro 3?

Claude Sonnet 5.5 has enough public results to be ranked (#10); Solar Pro 3 does not yet, so treat this comparison as directional.

Which is cheaper, Claude Sonnet 5.5 or Solar Pro 3?

Solar Pro 3 is cheaper. It lists at $0.25 per million input tokens and $0.25 per million output tokens; Claude Sonnet 5.5 lists at $2 and $10.

Is Claude Sonnet 5.5 or Solar Pro 3 better for coding?

Claude Sonnet 5.5 scores higher on coding benchmarks: 67.3 versus 34.8 in the Noometry coding category.

Which has the bigger context window?

Claude Sonnet 5.5 does, with 1M tokens against 131K.

How many benchmarks do Claude Sonnet 5.5 and Solar Pro 3 share?

2 benchmarks have published results for both models. Claude Sonnet 5.5 has 32 scored results on Noometry and Solar Pro 3 has 2.

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