Noometry

Model comparison

Claude Opus 5.5 vs Yi-Lightning

Claude Opus 5.5 is the stronger model overall, scoring 68.6 to 37.1 on the Noometry Index.

Last verified . 14 shared benchmarks.

Claude Opus 5.5 Anthropic

68.6

Rank #3 Confirmed

Yi-Lightning 01.AI

37.1

Rank #209 Confirmed

Summary

  • They share 14 benchmarks with published results for both. Claude Opus 5.5 scores higher in 8 categories and Yi-Lightning 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 36.2.

Side by side

Claude Opus 5.5Yi-Lightning
ProviderAnthropic01.AI
Noometry Index68.637.1
Released2026-09-222024-12-02
WeightsProprietaryProprietary
Context window1M—
Max output128K—
Input $ / M tokens$4—
Output $ / M tokens$20—
Results tracked4418

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Category by category

Coding Claude Opus 5.5 leads

Claude Opus 5.5: 71.9 (#3), Yi-Lightning: 27.4 (#320)

BenchmarkClaude Opus 5.5Yi-Lightning
LMArena Coding15471312
FrontierCode54.6%—
Aider Polyglot—12.9%
CursorBench57.8%—
LMArena WebDev1813—
FrontierSWE62.3%—
SciCode66.9%—
MirrorCode77.4%—
ALE-Bench2,147—

Agentic & Tool Use Not comparable

Claude Opus 5.5: 45.3 (#15), Yi-Lightning: —

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

Reasoning Claude Opus 5.5 leads

Claude Opus 5.5: 80.2 (#3), Yi-Lightning: 25.9 (#139)

BenchmarkClaude Opus 5.5Yi-Lightning
LMArena Hard Prompts15351302
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), Yi-Lightning: 36.2 (#172)

BenchmarkClaude Opus 5.5Yi-Lightning
LMArena Math15061300
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), Yi-Lightning: 35.4 (#185)

BenchmarkClaude Opus 5.5Yi-Lightning
LMArena Expert15471286
GPQA Diamond90.6%—
SimpleQA Verified72.2%—

Multimodal Not comparable

Claude Opus 5.5: 57.8 (#1), Yi-Lightning: —

BenchmarkClaude Opus 5.5Yi-Lightning
LMArena Vision1321—
Blueprint-Bench 251.2%—
Furniture Assembly83.3%—

Multilingual Claude Opus 5.5 leads

Claude Opus 5.5: 59.1 (#2), Yi-Lightning: 42.2 (#196)

BenchmarkClaude Opus 5.5Yi-Lightning
LMArena Non-English15071269
LMArena Chinese15881320
LMArena French15141305
LMArena Russian15201255
LMArena Spanish15071315
LMArena German—1267
LMArena Japanese—1228
LMArena Korean—1192

Instruction Following Claude Opus 5.5 leads

Claude Opus 5.5: 80.0 (#3), Yi-Lightning: 67.4 (#196)

BenchmarkClaude Opus 5.5Yi-Lightning
LMArena Instruction Following15371278

Long Context Claude Opus 5.5 leads

Claude Opus 5.5: 47.1 (#19), Yi-Lightning: 39.4 (#181)

BenchmarkClaude Opus 5.5Yi-Lightning
LMArena Longer Query15321297

Writing & Preference Claude Opus 5.5 leads

Claude Opus 5.5: 78.2 (#3), Yi-Lightning: 50.2 (#184)

BenchmarkClaude Opus 5.5Yi-Lightning
LMArena Text15151302
LMArena Creative Writing15331280
LMArena Multi-Turn14991311
EQ-Bench Creative Writing2050—

Frequently asked questions

Is Claude Opus 5.5 better than Yi-Lightning?

Claude Opus 5.5 is the stronger model overall, scoring 68.6 to 37.1 on the Noometry Index.

Is Claude Opus 5.5 or Yi-Lightning better for coding?

Claude Opus 5.5 scores higher on coding benchmarks: 71.9 versus 27.4 in the Noometry coding category.

How many benchmarks do Claude Opus 5.5 and Yi-Lightning share?

14 benchmarks have published results for both models. Claude Opus 5.5 has 44 scored results on Noometry and Yi-Lightning has 18.

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