Noometry

Model comparison

Claude Opus 5.5 vs Solar Pro4

Claude Opus 5.5 is the stronger model overall, scoring 68.6 to 42.1 on the Noometry Index. Solar Pro4 costs 15× less per token, which makes it the better buy when Claude Opus 5.5's lead doesn't matter for your workload.

Last verified . 15 shared benchmarks.

Claude Opus 5.5 Anthropic

68.6

Rank #3 Confirmed

Solar Pro4 Upstage

42.1

Rank #121 Confirmed

Summary

  • They share 15 benchmarks with published results for both. Claude Opus 5.5 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 Opus 5.5 leads 91.8 to 38.8.
  • Solar Pro4 is cheaper at $0.30 / $1.20 per million input/output tokens, against $4 / $20 for Claude Opus 5.5.
  • Claude Opus 5.5 accepts more context: 1M tokens versus 524K.

Side by side

Claude Opus 5.5Solar Pro4
ProviderAnthropicUpstage
Noometry Index68.642.1
Released2026-09-222026-08-06
WeightsProprietaryProprietary
Context window1M524K
Max output128K131K
Input $ / M tokens$4$0.30
Output $ / M tokens$20$1.20
Results tracked4418

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Category by category

Coding Claude Opus 5.5 leads

Claude Opus 5.5: 71.9 (#3), Solar Pro4: 40.1 (#149)

BenchmarkClaude Opus 5.5Solar Pro4
LMArena WebDev18131371
LMArena Coding15471437
FrontierCode54.6%—
CursorBench57.8%—
FrontierSWE62.3%—
SciCode66.9%—
MirrorCode77.4%—
ALE-Bench2,147—

Agentic & Tool Use Not comparable

Claude Opus 5.5: 45.3 (#15), Solar Pro4: —

BenchmarkClaude Opus 5.5Solar Pro4
APEX-Agents73.5%—
GDP.pdf30.6%—
Vending-Bench 29,235—

Reasoning Claude Opus 5.5 leads

Claude Opus 5.5: 80.2 (#3), Solar Pro4: 28.5 (#104)

BenchmarkClaude Opus 5.5Solar Pro4
LMArena Hard Prompts15351399
ARC-AGI-293.3%—
NYT Connections (extended)88.5%—
ARC-AGI-198.5%—
CritPt31.7%—
EBR-Bench71.4%—
Mystery Game Puzzles71%—
DTBench98.9%—
LMCA68.2%—
Epoch Capabilities Index167.33—

Math Claude Opus 5.5 leads

Claude Opus 5.5: 91.8 (#3), Solar Pro4: 38.8 (#128)

BenchmarkClaude Opus 5.5Solar Pro4
LMArena Math15061416
FrontierMath (Tiers 1-3)91.2%—
FrontierMath Tier 495%—
OTIS Mock AIME 2024-2025100%—
ProofBench100%—
FrontierMath Erdős2.9%—

Knowledge Claude Opus 5.5 leads

Claude Opus 5.5: 66.4 (#10), Solar Pro4: 39.8 (#129)

BenchmarkClaude Opus 5.5Solar Pro4
LMArena Expert15471427
GPQA Diamond90.6%—
SimpleQA Verified72.2%—

Multimodal Not comparable

Claude Opus 5.5: 57.8 (#1), Solar Pro4: —

BenchmarkClaude Opus 5.5Solar Pro4
LMArena Vision1321—
Blueprint-Bench 251.2%—
Furniture Assembly83.3%—

Multilingual Claude Opus 5.5 leads

Claude Opus 5.5: 59.1 (#2), Solar Pro4: 48.7 (#139)

BenchmarkClaude Opus 5.5Solar Pro4
LMArena Non-English15071361
LMArena Chinese15881415
LMArena French15141397
LMArena Russian15201360
LMArena Spanish15071401
LMArena German—1364
LMArena Japanese—1309
LMArena Korean—1382

Instruction Following Claude Opus 5.5 leads

Claude Opus 5.5: 80.0 (#3), Solar Pro4: 72.7 (#132)

BenchmarkClaude Opus 5.5Solar Pro4
LMArena Instruction Following15371377

Long Context Claude Opus 5.5 leads

Claude Opus 5.5: 47.1 (#19), Solar Pro4: 42.1 (#130)

BenchmarkClaude Opus 5.5Solar Pro4
LMArena Longer Query15321381

Writing & Preference Claude Opus 5.5 leads

Claude Opus 5.5: 78.2 (#3), Solar Pro4: 56.5 (#138)

BenchmarkClaude Opus 5.5Solar Pro4
LMArena Text15151386
LMArena Creative Writing15331316
LMArena Multi-Turn14991385
EQ-Bench Creative Writing2050—

Frequently asked questions

Is Claude Opus 5.5 better than Solar Pro4?

Claude Opus 5.5 is the stronger model overall, scoring 68.6 to 42.1 on the Noometry Index. Solar Pro4 costs 15× less per token, which makes it the better buy when Claude Opus 5.5's lead doesn't matter for your workload.

Which is cheaper, Claude Opus 5.5 or Solar Pro4?

Solar Pro4 is cheaper. It lists at $0.30 per million input tokens and $1.20 per million output tokens; Claude Opus 5.5 lists at $4 and $20.

Is Claude Opus 5.5 or Solar Pro4 better for coding?

Claude Opus 5.5 scores higher on coding benchmarks: 71.9 versus 40.1 in the Noometry coding category.

Which has the bigger context window?

Claude Opus 5.5 does, with 1M tokens against 524K.

How many benchmarks do Claude Opus 5.5 and Solar Pro4 share?

15 benchmarks have published results for both models. Claude Opus 5.5 has 44 scored results on Noometry and Solar Pro4 has 18.

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