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Modelreleased on 9 November 2026

Claude Fable 5.2

1stout of 71General intelligence, ECI index 174.2 (170.1 to 178.8)
Agent tasksnot measuredAPEX-Agents
Coding tasksnot measuredCursorBench
Electricity use of a tasknot estimatedmodel size unknown

Lineage

Company
Anthropic
Claude Fable family
55.15.2the family
Assistants that offer it
Claudepaid plan, Pro, Team (standard seats) according to the announcement (official page ↗)
API price
not recorded

Links read on 10/11/2026 on company pages, the press as a fallback; a link given for a family applies only to its latest version.

Rank in each benchmark

  • General intelligenceEpoch AI, ECI index174.2170.1 to 178.81st out of 71
  • User preferenceLMArena, Elo scorenot measured
  • Agent tasksEpoch AI, APEX-Agentsnot measured
  • Coding tasksEpoch AI, CursorBenchnot measured
  • Code repairEpoch AI, DeepSWEnot measured

Each segment of the bar is worth a tenth of the ranking; the 1st groups the best ranked. Rank among models released in 2026 and measured by the benchmark. Sources: Epoch AI, "Capabilities & benchmarking" (CC BY 4.0); LMArena, text with style control (CC BY 4.0); data as of 10 November 2026.

Claude Fable 5.2 among Anthropic's models, general intelligence

Epoch AI ECI index and its 95% interval, by release date; 12 Anthropic models released in 2026 and measured by the ECI index

FebAprJunAugOct150160170180General intelligence index (ECI)Claude Fable 5.2Claude Opus 5.5Claude Fable 5.1Claude Sonnet 5.5Claude Opus 5Claude Fable 5Claude Haiku 5.5Claude Opus 4.8Claude Opus 4.7

Dot: the index measured, at the release dateLine: the 95% intervalClaude Fable 5.23 names in the "Table" tab

Source: Epoch AI, "Capabilities & benchmarking", ECI index. CC BY 4.0 licence.

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