model_name: Mythos 5.1 / Fable 5.1
model_link: https://www.anthropic.com/claude-fable-and-mythos-5-1
organization: Anthropic
org_link: https://anthropic.com/
evaluation_date: '2026-09-04 08:00:00'
public_summary_link: https://trust.anthropic.com/resources
public_summary_date: '2026-09-01 08:00:00'
public_summary_location: https://trust.anthropic.com/resources
model_publication_date: '2026-09-01 08:00:00'
category: New
archive_file_name: Claude_Fable_Mythos_5_1_2026_09_08.pdf
general_notes: ''
S1:
  D1:
    score: 9.0
    max_score: 11.0
    notes: ''
  D2:
    score: 4.0
    max_score: 4.0
    notes: ''
  D3:
    score: 7.0
    max_score: 7.0
    notes: ''
  D4:
    score: 3.0
    max_score: 5.0
    notes: ''
  D5:
    score: 8.5
    max_score: 10.0
    notes: ''
  D6:
    score: 6.0
    max_score: 9.0
    notes: ''
S2:
  D1:
    score: 11.0
    max_score: 33.0
    notes: ''
  D2:
    score: 53.0
    max_score: 72.0
    notes: ''
  D3:
    score: 8.0
    max_score: 8.0
    notes: ''
  D4:
    score: 14.0
    max_score: 15.0
    notes: ''
  D5:
    score: 5.0
    max_score: 5.0
    notes: ''
  D6:
    score: 10.0
    max_score: 11.0
    notes: ''
S3:
  D1:
    score: 32.0
    max_score: 92.0
    notes: ''
  D2:
    score: 52.0
    max_score: 140.0
    notes: ''
  D3:
    score: 3.0
    max_score: 3.0
    notes: ''
  D4:
    score: 20.0
    max_score: 20.0
    notes: ''
  D5:
    score: 0.0
    max_score: 20.0
    notes: ''
  D6:
    score: 16.0
    max_score: 16.0
    notes: ''
S4:
  D1:
    score: 0.0
    max_score: 32.0
    notes: ''
  D2:
    score: 24.0
    max_score: 88.0
    notes: ''
  D3:
    score: 3.0
    max_score: 3.0
    notes: ''
  D4:
    score: 24.0
    max_score: 24.0
    notes: ''
  D5:
    score: 0.0
    max_score: 0.0
    notes: ''
  D6:
    score: 16.0
    max_score: 16.0
    notes: ''
S5:
  D1:
    score: 129.0
    max_score: 129.0
    notes: ''
  D2:
    score: 68.0
    max_score: 158.0
    notes: ''
  D3:
    score: 3.0
    max_score: 3.0
    notes: ''
  D4:
    score: 55.0
    max_score: 93.0
    notes: ''
  D5:
    score: 0.0
    max_score: 25.0
    notes: ''
  D6:
    score: 20.0
    max_score: 58.0
    notes: ''
S6:
  D1:
    score: 0.0
    max_score: 15.0
    notes: ''
  D2:
    score: 11.0
    max_score: 26.0
    notes: ''
  D3:
    score: 3.0
    max_score: 3.0
    notes: ''
  D4:
    score: 11.0
    max_score: 11.0
    notes: ''
  D5:
    score: 15.0
    max_score: 15.0
    notes: ''
  D6:
    score: 0.0
    max_score: 15.0
    notes: ''
S7:
  D1:
    score: 17.0
    max_score: 65.0
    notes: ''
  D2:
    score: 23.0
    max_score: 47.0
    notes: ''
  D3:
    score: 6.0
    max_score: 6.0
    notes: ''
  D4:
    score: 47.0
    max_score: 47.0
    notes: ''
  D5:
    score: 17.0
    max_score: 17.0
    notes: ''
  D6:
    score: 0.0
    max_score: 24.0
    notes: ''
S8:
  D1:
    score: 18.0
    max_score: 18.0
    notes: ''
  D2:
    score: 10.5
    max_score: 18.0
    notes: ''
  D3:
    score: 3.0
    max_score: 3.0
    notes: ''
  D4:
    score: 36.0
    max_score: 36.0
    notes: ''
  D5:
    score: 15.0
    max_score: 15.0
    notes: ''
  D6:
    score: 33.0
    max_score: 69.0
    notes: ''