Noometry

Model comparison

Claude Sonnet 5.5 vs Yi-Lightning

Claude Sonnet 5.5 is the stronger model overall, scoring 61.9 to 37.1 on the Noometry Index.

Last verified . 12 shared benchmarks.

Claude Sonnet 5.5 Anthropic

61.9

Rank #10 Confirmed

Yi-Lightning 01.AI

37.1

Rank #209 Confirmed

Summary

  • They share 12 benchmarks with published results for both. Claude Sonnet 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 Sonnet 5.5 leads 87.9 to 36.2.

Side by side

Claude Sonnet 5.5Yi-Lightning
ProviderAnthropic01.AI
Noometry Index61.937.1
Released2026-09-282024-12-02
WeightsProprietaryProprietary
Context window1M—
Max output128K—
Input $ / M tokens$2—
Output $ / M tokens$10—
Results tracked3218

Sponsored placements are available on pages like this one. Advertise on Noometry

Category by category

Coding Claude Sonnet 5.5 leads

Claude Sonnet 5.5: 67.3 (#6), Yi-Lightning: 27.4 (#320)

BenchmarkClaude Sonnet 5.5Yi-Lightning
LMArena Coding15131312
FrontierCode52.1%—
Aider Polyglot—12.9%
CursorBench55.5%—
LMArena WebDev1774—
FrontierSWE61.9%—
SciCode61%—
ALE-Bench1,819—

Agentic & Tool Use Not comparable

Claude Sonnet 5.5: 45.0 (#16), Yi-Lightning: —

BenchmarkClaude Sonnet 5.5Yi-Lightning
APEX-Agents75.5%—

Reasoning Claude Sonnet 5.5 leads

Claude Sonnet 5.5: 54.0 (#28), Yi-Lightning: 25.9 (#139)

BenchmarkClaude Sonnet 5.5Yi-Lightning
LMArena Hard Prompts14951302
NYT Connections (extended)80.5%—
CritPt31.4%—
Mystery Game Puzzles65%—
Epoch Capabilities Index165.03—

Math Claude Sonnet 5.5 leads

Claude Sonnet 5.5: 87.9 (#6), Yi-Lightning: 36.2 (#172)

BenchmarkClaude Sonnet 5.5Yi-Lightning
LMArena Math15101300
FrontierMath (Tiers 1-3)88.8%—
FrontierMath Tier 480.5%—
OTIS Mock AIME 2024-2025100%—
ProofBench100%—
FrontierMath Erdős2.9%—

Knowledge Claude Sonnet 5.5 leads

Claude Sonnet 5.5: 66.0 (#12), Yi-Lightning: 35.4 (#185)

BenchmarkClaude Sonnet 5.5Yi-Lightning
LMArena Expert15401286
GPQA Diamond95.6%—
SimpleQA Verified46.5%—

Multimodal Not comparable

Claude Sonnet 5.5: 51.5 (#6), Yi-Lightning: —

BenchmarkClaude Sonnet 5.5Yi-Lightning
LMArena Vision1289—
Furniture Assembly75%—

Multilingual Claude Sonnet 5.5 leads

Claude Sonnet 5.5: 55.3 (#30), Yi-Lightning: 42.2 (#196)

BenchmarkClaude Sonnet 5.5Yi-Lightning
LMArena Non-English14521269
LMArena Chinese15221320
LMArena Russian14511255
LMArena French—1305
LMArena German—1267
LMArena Japanese—1228
LMArena Korean—1192
LMArena Spanish—1315

Instruction Following Claude Sonnet 5.5 leads

Claude Sonnet 5.5: 78.3 (#11), Yi-Lightning: 67.4 (#196)

BenchmarkClaude Sonnet 5.5Yi-Lightning
LMArena Instruction Following14951278

Long Context Claude Sonnet 5.5 leads

Claude Sonnet 5.5: 45.9 (#28), Yi-Lightning: 39.4 (#181)

BenchmarkClaude Sonnet 5.5Yi-Lightning
LMArena Longer Query14981297

Writing & Preference Claude Sonnet 5.5 leads

Claude Sonnet 5.5: 66.0 (#40), Yi-Lightning: 50.2 (#184)

BenchmarkClaude Sonnet 5.5Yi-Lightning
LMArena Text14711302
LMArena Creative Writing14651280
LMArena Multi-Turn14741311

Frequently asked questions

Is Claude Sonnet 5.5 better than Yi-Lightning?

Claude Sonnet 5.5 is the stronger model overall, scoring 61.9 to 37.1 on the Noometry Index.

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

Claude Sonnet 5.5 scores higher on coding benchmarks: 67.3 versus 27.4 in the Noometry coding category.

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

12 benchmarks have published results for both models. Claude Sonnet 5.5 has 32 scored results on Noometry and Yi-Lightning has 18.

Related comparisons

Go deeper