Noometry

Model comparison

Claude Fable 5.1 vs Qwen3.8 Flash

Claude Fable 5.1 has enough public results to be ranked (#2); Qwen3.8 Flash does not yet, so treat this comparison as directional.

Last verified . 1 shared benchmarks.

Claude Fable 5.1 Anthropic

69.0

Rank #2 Confirmed

Qwen3.8 Flash Alibaba (Qwen)

35.5

Unranked Sparse

Summary

  • They share 1 benchmark with published results for both. Claude Fable 5.1 scores higher in 1 category and Qwen3.8 Flash in 0 categories; one gap is clear of the uncertainty.
  • The widest gap is in agentic & tool use, where Claude Fable 5.1 leads 50.7 to 31.3.
  • The biggest single-benchmark swing is GDP.pdf: 29.6% for Claude Fable 5.1 and 16.6% for Qwen3.8 Flash.
  • Qwen3.8 Flash is cheaper at $0.15 / $0.47 per million input/output tokens, against $10 / $50 for Claude Fable 5.1.

Side by side

Claude Fable 5.1Qwen3.8 Flash
ProviderAnthropicAlibaba (Qwen)
Noometry Index69.035.5
Released2026-09-012026-08-26
WeightsProprietaryProprietary
Context window1M1M
Max output128K131K
Input $ / M tokens$10$0.15
Output $ / M tokens$50$0.47
Results tracked521

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Category by category

Coding Not comparable

Claude Fable 5.1: 74.7 (#1), Qwen3.8 Flash: —

BenchmarkClaude Fable 5.1Qwen3.8 Flash
FrontierCode50.9%—
CursorBench51.8%—
LMArena WebDev1744—
FrontierSWE56.3%—
SciCode63.1%—
GSO88.2%—
WeirdML92.9%—
LMArena Coding1528—
MirrorCode73.3%—
ALE-Bench2,143—

Agentic & Tool Use Claude Fable 5.1 leads

Claude Fable 5.1: 50.7 (#5), Qwen3.8 Flash: 31.3

BenchmarkClaude Fable 5.1Qwen3.8 Flash
GDP.pdf29.6%16.6%
APEX-Agents68.6%—
Remote Labor Index17.9%—
Vending-Bench 25,422—

Reasoning Not comparable

Claude Fable 5.1: 76.7 (#7), Qwen3.8 Flash: —

BenchmarkClaude Fable 5.1Qwen3.8 Flash
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 Not comparable

Claude Fable 5.1: 89.6 (#4), Qwen3.8 Flash: —

BenchmarkClaude Fable 5.1Qwen3.8 Flash
FrontierMath (Tiers 1-3)90.2%—
FrontierMath Tier 487.8%—
OTIS Mock AIME 2024-2025100%—
ProofBench100%—
LMArena Math1525—
FrontierMath Erdős0%—

Knowledge Not comparable

Claude Fable 5.1: 69.6 (#6), Qwen3.8 Flash: —

BenchmarkClaude Fable 5.1Qwen3.8 Flash
Humanity's Last Exam46.5%—
SimpleQA Verified70.8%—
LMArena Expert1535—

Multimodal Not comparable

Claude Fable 5.1: 53.9 (#4), Qwen3.8 Flash: —

BenchmarkClaude Fable 5.1Qwen3.8 Flash
LMArena Vision1318—
Blueprint-Bench 241.9%—
Furniture Assembly70%—
LMArena Document1513—

Multilingual Not comparable

Claude Fable 5.1: 59.1 (#3), Qwen3.8 Flash: —

BenchmarkClaude Fable 5.1Qwen3.8 Flash
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), Qwen3.8 Flash: —

BenchmarkClaude Fable 5.1Qwen3.8 Flash
LMArena Instruction Following1517—

Long Context Not comparable

Claude Fable 5.1: 46.7 (#20), Qwen3.8 Flash: —

BenchmarkClaude Fable 5.1Qwen3.8 Flash
LMArena Longer Query1522—

Writing & Preference Not comparable

Claude Fable 5.1: 79.2 (#2), Qwen3.8 Flash: —

BenchmarkClaude Fable 5.1Qwen3.8 Flash
LMArena Text1510—
LMArena Creative Writing1507—
EQ-Bench Creative Writing2162—
LMArena Multi-Turn1492—

Frequently asked questions

Is Claude Fable 5.1 better than Qwen3.8 Flash?

Claude Fable 5.1 has enough public results to be ranked (#2); Qwen3.8 Flash does not yet, so treat this comparison as directional.

Which is cheaper, Claude Fable 5.1 or Qwen3.8 Flash?

Qwen3.8 Flash is cheaper. It lists at $0.15 per million input tokens and $0.47 per million output tokens; Claude Fable 5.1 lists at $10 and $50.

Which has the bigger context window?

Both accept 1M tokens.

How many benchmarks do Claude Fable 5.1 and Qwen3.8 Flash share?

1 benchmark has published results for both models. Claude Fable 5.1 has 52 scored results on Noometry and Qwen3.8 Flash has 1.

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