Noometry

Model comparison

Claude Fable 5.1 vs Laguna XS.2

Claude Fable 5.1 has enough public results to be ranked (#2); Laguna XS.2 does not yet, so treat this comparison as directional.

Last verified . 2 shared benchmarks.

Claude Fable 5.1 Anthropic

69.0

Rank #2 Confirmed

Laguna XS.2 Poolside

32.9

Unranked Sparse

Summary

  • They share 2 benchmarks with published results for both. Claude Fable 5.1 scores higher in 2 categories and Laguna XS.2 in 0 categories; 2 gaps are clear of the uncertainty.
  • The widest gap is in math, where Claude Fable 5.1 leads 89.6 to 21.1.
  • The biggest single-benchmark swing is ProofBench: 100% for Claude Fable 5.1 and 0% for Laguna XS.2.
  • Laguna XS.2 has downloadable open weights; the other is API-only.

Side by side

Claude Fable 5.1Laguna XS.2
ProviderAnthropicPoolside
Noometry Index69.032.9
Released2026-09-012026-04-28
WeightsProprietaryOpen
Context window1M—
Max output128K—
Input $ / M tokens$10—
Output $ / M tokens$50—
Results tracked522

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Category by category

Coding Claude Fable 5.1 leads

Claude Fable 5.1: 74.7 (#1), Laguna XS.2: 34.4

BenchmarkClaude Fable 5.1Laguna XS.2
LMArena WebDev17441302
FrontierCode50.9%—
CursorBench51.8%—
FrontierSWE56.3%—
SciCode63.1%—
GSO88.2%—
WeirdML92.9%—
LMArena Coding1528—
MirrorCode73.3%—
ALE-Bench2,143—

Agentic & Tool Use Not comparable

Claude Fable 5.1: 50.7 (#5), Laguna XS.2: —

BenchmarkClaude Fable 5.1Laguna XS.2
APEX-Agents68.6%—
Remote Labor Index17.9%—
GDP.pdf29.6%—
Vending-Bench 25,422—

Reasoning Not comparable

Claude Fable 5.1: 76.7 (#7), Laguna XS.2: —

BenchmarkClaude Fable 5.1Laguna XS.2
ARC-AGI-290%—
NYT Connections (extended)90%—
ARC-AGI-197.5%—
CritPt31.1%—
Chess Puzzles47%—
EBR-Bench57.1%—
LMArena Hard Prompts1526—
Mystery Game Puzzles58%—
DTBench97.6%—
LMCA65.5%—
Epoch Capabilities Index164.7—

Math Claude Fable 5.1 leads

Claude Fable 5.1: 89.6 (#4), Laguna XS.2: 21.1

BenchmarkClaude Fable 5.1Laguna XS.2
ProofBench100%0%
FrontierMath (Tiers 1-3)90.2%—
FrontierMath Tier 487.8%—
OTIS Mock AIME 2024-2025100%—
LMArena Math1525—
FrontierMath Erdős0%—

Knowledge Not comparable

Claude Fable 5.1: 69.6 (#6), Laguna XS.2: —

BenchmarkClaude Fable 5.1Laguna XS.2
Humanity's Last Exam46.5%—
SimpleQA Verified70.8%—
LMArena Expert1535—

Multimodal Not comparable

Claude Fable 5.1: 53.9 (#4), Laguna XS.2: —

BenchmarkClaude Fable 5.1Laguna XS.2
LMArena Vision1318—
Blueprint-Bench 241.9%—
Furniture Assembly70%—
LMArena Document1513—

Multilingual Not comparable

Claude Fable 5.1: 59.1 (#3), Laguna XS.2: —

BenchmarkClaude Fable 5.1Laguna XS.2
LMArena Non-English1507—
LMArena Chinese1586—
LMArena French1525—
LMArena German1500—
LMArena Japanese1543—
LMArena Korean1534—
LMArena Russian1521—
LMArena Spanish1516—

Instruction Following Not comparable

Claude Fable 5.1: 79.2 (#6), Laguna XS.2: —

BenchmarkClaude Fable 5.1Laguna XS.2
LMArena Instruction Following1517—

Long Context Not comparable

Claude Fable 5.1: 46.7 (#20), Laguna XS.2: —

BenchmarkClaude Fable 5.1Laguna XS.2
LMArena Longer Query1522—

Writing & Preference Not comparable

Claude Fable 5.1: 79.2 (#2), Laguna XS.2: —

BenchmarkClaude Fable 5.1Laguna XS.2
LMArena Text1510—
LMArena Creative Writing1507—
EQ-Bench Creative Writing2162—
LMArena Multi-Turn1492—

Frequently asked questions

Is Claude Fable 5.1 better than Laguna XS.2?

Claude Fable 5.1 has enough public results to be ranked (#2); Laguna XS.2 does not yet, so treat this comparison as directional.

Is Claude Fable 5.1 or Laguna XS.2 better for coding?

Claude Fable 5.1 scores higher on coding benchmarks: 74.7 versus 34.4 in the Noometry coding category.

How many benchmarks do Claude Fable 5.1 and Laguna XS.2 share?

2 benchmarks have published results for both models. Claude Fable 5.1 has 52 scored results on Noometry and Laguna XS.2 has 2.

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