Noometry

Model comparison

Claude Fable 5.1 vs Claude Instant

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

Last verified . 2 shared benchmarks.

Claude Fable 5.1 Anthropic

69.0

Rank #2 Confirmed

Claude Instant Anthropic

29.5

Unranked Sparse

Summary

  • They share 2 benchmarks with published results for both. Claude Fable 5.1 scores higher in 1 category and Claude Instant in 0 categories; one gap is clear of the uncertainty.
  • The widest gap is in reasoning, where Claude Fable 5.1 leads 76.7 to 19.6.
  • The biggest single-benchmark swing is DTBench: 97.6% for Claude Fable 5.1 and 45.8% for Claude Instant.

Side by side

Claude Fable 5.1Claude Instant
ProviderAnthropicAnthropic
Noometry Index69.029.5
Released2026-09-012023-08-09
WeightsProprietaryProprietary
Context window1M—
Max output128K—
Input $ / M tokens$10—
Output $ / M tokens$50—
Results tracked527

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Category by category

Coding Not comparable

Claude Fable 5.1: 74.7 (#1), Claude Instant: —

BenchmarkClaude Fable 5.1Claude Instant
FrontierCode50.9%—
CursorBench51.8%—
LMArena WebDev1744—
FrontierSWE56.3%—
SciCode63.1%—
GSO88.2%—
WeirdML92.9%—
LMArena Coding1528—
MirrorCode73.3%—
ALE-Bench2,143—
HumanEval+—50.6%

Agentic & Tool Use Not comparable

Claude Fable 5.1: 50.7 (#5), Claude Instant: —

BenchmarkClaude Fable 5.1Claude Instant
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), Claude Instant: 19.6

BenchmarkClaude Fable 5.1Claude Instant
DTBench97.6%45.8%
Epoch Capabilities Index164.7120.28
ARC-AGI-290%—
NYT Connections (extended)90%—
ARC-AGI-197.5%—
CritPt31.1%—
Chess Puzzles47%—
EBR-Bench57.1%—
LMArena Hard Prompts1526—
Mystery Game Puzzles58%—
LMCA65.5%—

Math Not comparable

Claude Fable 5.1: 89.6 (#4), Claude Instant: —

BenchmarkClaude Fable 5.1Claude Instant
FrontierMath (Tiers 1-3)90.2%—
FrontierMath Tier 487.8%—
OTIS Mock AIME 2024-2025100%—
ProofBench100%—
LMArena Math1525—
FrontierMath Erdős0%—
GSM8K—86.7%

Knowledge Not comparable

Claude Fable 5.1: 69.6 (#6), Claude Instant: —

BenchmarkClaude Fable 5.1Claude Instant
Humanity's Last Exam46.5%—
SimpleQA Verified70.8%—
LMArena Expert1535—
ARC (AI2) Challenge—86.3%
MMLU—73.4%
TriviaQA—78.9%

Multimodal Not comparable

Claude Fable 5.1: 53.9 (#4), Claude Instant: —

BenchmarkClaude Fable 5.1Claude Instant
LMArena Vision1318—
Blueprint-Bench 241.9%—
Furniture Assembly70%—
LMArena Document1513—

Multilingual Not comparable

Claude Fable 5.1: 59.1 (#3), Claude Instant: —

BenchmarkClaude Fable 5.1Claude Instant
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), Claude Instant: —

BenchmarkClaude Fable 5.1Claude Instant
LMArena Instruction Following1517—

Long Context Not comparable

Claude Fable 5.1: 46.7 (#20), Claude Instant: —

BenchmarkClaude Fable 5.1Claude Instant
LMArena Longer Query1522—

Writing & Preference Not comparable

Claude Fable 5.1: 79.2 (#2), Claude Instant: —

BenchmarkClaude Fable 5.1Claude Instant
LMArena Text1510—
LMArena Creative Writing1507—
EQ-Bench Creative Writing2162—
LMArena Multi-Turn1492—

Frequently asked questions

Is Claude Fable 5.1 better than Claude Instant?

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

How many benchmarks do Claude Fable 5.1 and Claude Instant share?

2 benchmarks have published results for both models. Claude Fable 5.1 has 52 scored results on Noometry and Claude Instant has 7.

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