Noometry

Model comparison

Claude Fable 5.1 vs o1-pro

Claude Fable 5.1 is the stronger model overall, scoring 69.0 to 31.5 on the Noometry Index.

Last verified . 2 shared benchmarks.

Claude Fable 5.1 Anthropic

69.0

Rank #2 Confirmed

o1-pro OpenAI

31.5

Rank #271 Reported

Summary

  • They share 2 benchmarks with published results for both. Claude Fable 5.1 scores higher in 2 categories and o1-pro in 0 categories; 2 gaps are clear of the uncertainty.
  • The widest gap is in reasoning, where Claude Fable 5.1 leads 76.7 to 20.4.
  • The biggest single-benchmark swing is ARC-AGI-1: 97.5% for Claude Fable 5.1 and 23.3% for o1-pro.
  • Claude Fable 5.1 is cheaper at $10 / $50 per million input/output tokens, against $150 / $600 for o1-pro.
  • Claude Fable 5.1 accepts more context: 1M tokens versus 200K.

Side by side

Claude Fable 5.1o1-pro
ProviderAnthropicOpenAI
Noometry Index69.031.5
Released2026-09-012025-03-19
WeightsProprietaryProprietary
Context window1M200K
Max output128K100K
Input $ / M tokens$10$150
Output $ / M tokens$50$600
Results tracked523

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Category by category

Coding Not comparable

Claude Fable 5.1: 74.7 (#1), o1-pro: —

BenchmarkClaude Fable 5.1o1-pro
FrontierCode50.9%—
CursorBench51.8%—
LMArena WebDev1744—
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), o1-pro: —

BenchmarkClaude Fable 5.1o1-pro
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), o1-pro: 20.4 (#239)

BenchmarkClaude Fable 5.1o1-pro
ARC-AGI-197.5%23.3%
ARC-AGI-290%—
NYT Connections (extended)90%—
CritPt31.1%—
Chess Puzzles47%—
EnigmaEval—6.1%
EBR-Bench57.1%—
LMArena Hard Prompts1526—
Mystery Game Puzzles58%—
DTBench97.6%—
LMCA65.5%—
Epoch Capabilities Index164.7—

Math Not comparable

Claude Fable 5.1: 89.6 (#4), o1-pro: —

BenchmarkClaude Fable 5.1o1-pro
FrontierMath (Tiers 1-3)90.2%—
FrontierMath Tier 487.8%—
OTIS Mock AIME 2024-2025100%—
ProofBench100%—
LMArena Math1525—
FrontierMath Erdős0%—

Knowledge Claude Fable 5.1 leads

Claude Fable 5.1: 69.6 (#6), o1-pro: 29.7 (#234)

BenchmarkClaude Fable 5.1o1-pro
Humanity's Last Exam46.5%8.1%
SimpleQA Verified70.8%—
LMArena Expert1535—

Multimodal Not comparable

Claude Fable 5.1: 53.9 (#4), o1-pro: —

BenchmarkClaude Fable 5.1o1-pro
LMArena Vision1318—
Blueprint-Bench 241.9%—
Furniture Assembly70%—
LMArena Document1513—

Multilingual Not comparable

Claude Fable 5.1: 59.1 (#3), o1-pro: —

BenchmarkClaude Fable 5.1o1-pro
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), o1-pro: —

BenchmarkClaude Fable 5.1o1-pro
LMArena Instruction Following1517—

Long Context Not comparable

Claude Fable 5.1: 46.7 (#20), o1-pro: —

BenchmarkClaude Fable 5.1o1-pro
LMArena Longer Query1522—

Writing & Preference Not comparable

Claude Fable 5.1: 79.2 (#2), o1-pro: —

BenchmarkClaude Fable 5.1o1-pro
LMArena Text1510—
LMArena Creative Writing1507—
EQ-Bench Creative Writing2162—
LMArena Multi-Turn1492—

Frequently asked questions

Is Claude Fable 5.1 better than o1-pro?

Claude Fable 5.1 is the stronger model overall, scoring 69.0 to 31.5 on the Noometry Index.

Which is cheaper, Claude Fable 5.1 or o1-pro?

Claude Fable 5.1 is cheaper. It lists at $10 per million input tokens and $50 per million output tokens; o1-pro lists at $150 and $600.

Which has the bigger context window?

Claude Fable 5.1 does, with 1M tokens against 200K.

How many benchmarks do Claude Fable 5.1 and o1-pro share?

2 benchmarks have published results for both models. Claude Fable 5.1 has 52 scored results on Noometry and o1-pro has 3.

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