Noometry

Model comparison

Claude Fable 5 vs Claude Mythos Preview

Claude Fable 5 has enough public results to be ranked (#5); Claude Mythos Preview does not yet, so treat this comparison as directional.

Last verified . 0 shared benchmarks.

Claude Fable 5 Anthropic

66.8

Rank #5 Confirmed

Claude Mythos Preview Anthropic

41.2

Unranked Sparse

Summary

  • The widest gap is in agentic & tool use, where Claude Fable 5 leads 54.0 to 41.4.

Side by side

Claude Fable 5Claude Mythos Preview
ProviderAnthropicAnthropic
Noometry Index66.841.2
Released2026-06-072026-04-07
WeightsProprietaryProprietary
Context window1M—
Max output128K—
Input $ / M tokens$10—
Output $ / M tokens$50—
Results tracked622

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Category by category

Coding Not comparable

Claude Fable 5: 70.6 (#4), Claude Mythos Preview: —

BenchmarkClaude Fable 5Claude Mythos Preview
DeepSWE69.9%—
FrontierCode53.5%—
LMArena WebDev1625—
FrontierSWE47%—
SciCode61%—
GSO78.4%—
WeirdML91.9%—
LMArena Coding1519—
MirrorCode63.9%—
ALE-Bench2,041—

Agentic & Tool Use Claude Fable 5 leads

Claude Fable 5: 54.0 (#2), Claude Mythos Preview: 41.4

BenchmarkClaude Fable 5Claude Mythos Preview
APEX-Agents63.6%—
Remote Labor Index16.1%—
τ²-bench Banking39.7%—
PostTrainBench41.8%—
ExploitBench—73.8%
GBAEval74.5%—
GDP.pdf30%—
LMArena Search1230—
METR Time Horizons—85.2%
Vending-Bench 25,680—

Reasoning Not comparable

Claude Fable 5: 76.8 (#6), Claude Mythos Preview: —

BenchmarkClaude Fable 5Claude Mythos Preview
ARC-AGI-289.2%—
SimpleBench81.9%—
Kagi LLM Benchmark91.4%—
NYT Connections (extended)92.7%—
ARC-AGI-198.5%—
CritPt28.6%—
Chess Puzzles41%—
EnigmaEval39.3%—
EBR-Bench39.5%—
LMArena Hard Prompts1508—
Mystery Game Puzzles52%—
DTBench98.4%—
LMCA61.1%—
Surface Evolver Bench95%—
Bench to the Future 30.13—
Epoch Capabilities Index162.06—

Math Not comparable

Claude Fable 5: 88.5 (#5), Claude Mythos Preview: —

BenchmarkClaude Fable 5Claude Mythos Preview
FrontierMath (Tiers 1-3)87%—
FrontierMath Tier 490.2%—
OTIS Mock AIME 2024-2025100%—
ProofBench95%—
LMArena Math1519—
FrontierMath Erdős0%—

Knowledge Not comparable

Claude Fable 5: 62.2 (#25), Claude Mythos Preview: —

BenchmarkClaude Fable 5Claude Mythos Preview
GPQA Diamond85.9%—
SimpleQA Verified70.7%—
LMArena Expert1534—

Multimodal Not comparable

Claude Fable 5: 45.3 (#17), Claude Mythos Preview: —

BenchmarkClaude Fable 5Claude Mythos Preview
LMArena Vision1324—
Blueprint-Bench 238.6%—
Furniture Assembly35.8%—
LMArena Document1496—

Multilingual Not comparable

Claude Fable 5: 57.3 (#9), Claude Mythos Preview: —

BenchmarkClaude Fable 5Claude Mythos Preview
LMArena Non-English1481—
LMArena Chinese1543—
LMArena French1505—
LMArena German1486—
LMArena Japanese1506—
LMArena Korean1488—
LMArena Russian1504—
LMArena Spanish1498—

Instruction Following Not comparable

Claude Fable 5: 78.6 (#8), Claude Mythos Preview: —

BenchmarkClaude Fable 5Claude Mythos Preview
LMArena Instruction Following1502—

Long Context Not comparable

Claude Fable 5: 46.3 (#23), Claude Mythos Preview: —

BenchmarkClaude Fable 5Claude Mythos Preview
LMArena Longer Query1509—

Writing & Preference Not comparable

Claude Fable 5: 75.9 (#5), Claude Mythos Preview: —

BenchmarkClaude Fable 5Claude Mythos Preview
LMArena Text1491—
LMArena Creative Writing1494—
EQ-Bench Creative Writing1943—
EQ-Bench 41340—
LMArena Multi-Turn1504—

Frequently asked questions

Is Claude Fable 5 better than Claude Mythos Preview?

Claude Fable 5 has enough public results to be ranked (#5); Claude Mythos Preview does not yet, so treat this comparison as directional.

How many benchmarks do Claude Fable 5 and Claude Mythos Preview share?

0 benchmarks have published results for both models. Claude Fable 5 has 62 scored results on Noometry and Claude Mythos Preview has 2.

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