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tensor.news grades benchmarks and tags model claims by evidence status. Every fact carries a source record and provenance. Scores are framed as task performance under a disclosed harness, never as deployed capability.

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Claude Fable 5 vs Claude Opus 4.8

Verdict

Claude Fable 5 leads 12–0 across 12 shared benchmarks.

Claude Fable 5 12 · Claude Opus 4.8 0 · higher isn't always better — see caveats.

Per-benchmark head-to-head

Claude Fable 5Claude Opus 4.8
  • 45
    APEX-Agents
    42.5
  • 41
    Chess Puzzles
    34
  • 28.57
    CritPt
    20.86
  • 72.9
    CursorBench
    63.8
  • 87.8
    FrontierMath-Tier-4-v2-Private
    56.1
  • 87.02
    FrontierMath-Tiers-1-3-v2-Private
    80
  • 74.47
    GBAEval
    70.9
  • 99.72
    OTIS Mock AIME 2024-2025
    98.33
  • 16.1
    Remote Labor Index
    8.33
  • 78.28
    SimpleBench
    57.76
  • 68.3
    SimpleQA Verified
    39.5
  • 87.85
    WeirdML
    82.89
A higher number is not always a better model. Each score is task performance under a disclosed harness, and some of these benchmarks are saturated or scored under mixed harnesses. Follow any benchmark to its integrity grade before reading a win as decisive.

Follow the record

These models

  • Claude Fable 599.72
  • Claude Opus 4.898.33

Claude Fable 5 vs …

  • vs PowerMoE-3b
  • vs GPT-5.5
  • vs Gemini 3.1 Pro
  • vs Llama 3.1-405B
  • vs phi-3-small 7.4B