Intelligence Index

Comprehensive AI model evaluation framework developed by artificial-analysis that ranks models across multiple capabilities and domains. claude-fable 5 achieved the top position with a score of 64.9, approximately 5 points ahead of GPT-5.5.

Scoring and Methodology

Claude Fable 5 Performance

• Overall score: 64.9 (ranked #1)
• Lead over second place: ~5 points ahead of GPT-5.5
• Notable achievement: anthropic occupied the top two positions

Evaluation Scope

The Intelligence Index assesses models across:

• Knowledge work capabilities
• Reasoning and problem-solving
• Domain-specific expertise
• Real-world task performance

Fallback Routing Analysis

Within Intelligence Index evaluation:

• Fallback rate: ~8% across Intelligence Index tasks
• Primary trigger: Scientific questions
• Routing destination: claude-opus-48 for sensitive queries

Significance

The Intelligence Index provides a holistic view of AI model capabilities beyond specialized benchmarks, making claude-fable 5's top ranking particularly meaningful for general-purpose applications.

See also

• artificial-analysis
• claude-fable
• benchmark-leadership
• fallback-routing