Noometry

Model comparison

Claude Fable 5.1 vs Yi-Lightning

Claude Fable 5.1 is the stronger model overall, scoring 69.0 to 37.1 on the Noometry Index.

Last verified . 17 shared benchmarks.

Claude Fable 5.1 Anthropic

69.0

Rank #2 Confirmed

Yi-Lightning 01.AI

37.1

Rank #209 Confirmed

Summary

  • They share 17 benchmarks with published results for both. Claude Fable 5.1 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 Fable 5.1 leads 89.6 to 36.2.

Side by side

Claude Fable 5.1Yi-Lightning
ProviderAnthropic01.AI
Noometry Index69.037.1
Released2026-09-012024-12-02
WeightsProprietaryProprietary
Context window1M—
Max output128K—
Input $ / M tokens$10—
Output $ / M tokens$50—
Results tracked5218

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

Category by category

Coding Claude Fable 5.1 leads

Claude Fable 5.1: 74.7 (#1), Yi-Lightning: 27.4 (#320)

BenchmarkClaude Fable 5.1Yi-Lightning
LMArena Coding15281312
FrontierCode50.9%—
Aider Polyglot—12.9%
CursorBench51.8%—
LMArena WebDev1744—
FrontierSWE56.3%—
SciCode63.1%—
GSO88.2%—
WeirdML92.9%—
MirrorCode73.3%—
ALE-Bench2,143—

Agentic & Tool Use Not comparable

Claude Fable 5.1: 50.7 (#5), Yi-Lightning: —

BenchmarkClaude Fable 5.1Yi-Lightning
APEX-Agents68.6%—
Remote Labor Index17.9%—
GDP.pdf29.6%—
Vending-Bench 25,422—

Reasoning Claude Fable 5.1 leads

Claude Fable 5.1: 76.7 (#7), Yi-Lightning: 25.9 (#139)

BenchmarkClaude Fable 5.1Yi-Lightning
LMArena Hard Prompts15261302
ARC-AGI-290%—
NYT Connections (extended)90%—
ARC-AGI-197.5%—
CritPt31.1%—
Chess Puzzles47%—
EBR-Bench57.1%—
Mystery Game Puzzles58%—
DTBench97.6%—
LMCA65.5%—
Epoch Capabilities Index164.7—

Math Claude Fable 5.1 leads

Claude Fable 5.1: 89.6 (#4), Yi-Lightning: 36.2 (#172)

BenchmarkClaude Fable 5.1Yi-Lightning
LMArena Math15251300
FrontierMath (Tiers 1-3)90.2%—
FrontierMath Tier 487.8%—
OTIS Mock AIME 2024-2025100%—
ProofBench100%—
FrontierMath Erdős0%—

Knowledge Claude Fable 5.1 leads

Claude Fable 5.1: 69.6 (#6), Yi-Lightning: 35.4 (#185)

BenchmarkClaude Fable 5.1Yi-Lightning
LMArena Expert15351286
Humanity's Last Exam46.5%—
SimpleQA Verified70.8%—

Multimodal Not comparable

Claude Fable 5.1: 53.9 (#4), Yi-Lightning: —

BenchmarkClaude Fable 5.1Yi-Lightning
LMArena Vision1318—
Blueprint-Bench 241.9%—
Furniture Assembly70%—
LMArena Document1513—

Multilingual Claude Fable 5.1 leads

Claude Fable 5.1: 59.1 (#3), Yi-Lightning: 42.2 (#196)

BenchmarkClaude Fable 5.1Yi-Lightning
LMArena Non-English15071269
LMArena Chinese15861320
LMArena French15251305
LMArena German15001267
LMArena Japanese15431228
LMArena Korean15341192
LMArena Russian15211255
LMArena Spanish15161315

Instruction Following Claude Fable 5.1 leads

Claude Fable 5.1: 79.2 (#6), Yi-Lightning: 67.4 (#196)

BenchmarkClaude Fable 5.1Yi-Lightning
LMArena Instruction Following15171278

Long Context Claude Fable 5.1 leads

Claude Fable 5.1: 46.7 (#20), Yi-Lightning: 39.4 (#181)

BenchmarkClaude Fable 5.1Yi-Lightning
LMArena Longer Query15221297

Writing & Preference Claude Fable 5.1 leads

Claude Fable 5.1: 79.2 (#2), Yi-Lightning: 50.2 (#184)

BenchmarkClaude Fable 5.1Yi-Lightning
LMArena Text15101302
LMArena Creative Writing15071280
LMArena Multi-Turn14921311
EQ-Bench Creative Writing2162—

Frequently asked questions

Is Claude Fable 5.1 better than Yi-Lightning?

Claude Fable 5.1 is the stronger model overall, scoring 69.0 to 37.1 on the Noometry Index.

Is Claude Fable 5.1 or Yi-Lightning better for coding?

Claude Fable 5.1 scores higher on coding benchmarks: 74.7 versus 27.4 in the Noometry coding category.

How many benchmarks do Claude Fable 5.1 and Yi-Lightning share?

17 benchmarks have published results for both models. Claude Fable 5.1 has 52 scored results on Noometry and Yi-Lightning has 18.

Related comparisons

Go deeper