Claude Fable 5.1 (Adaptive Reasoning, Max Effort, Default Fallback) vs Claude Opus 5 (Adaptive Reasoning, Max Effort)

Anthropic · Anthropic · catalog 2026-09-14

Trade-off: Claude Opus 5 (Adaptive Reasoning, Max Effort) is cheaper ($3.85 vs $7.175/M); Claude Fable 5.1 (Adaptive Reasoning, Max Effort, Default Fallback) scores higher on intelligence (53.4 vs 50.7).
Claude Fable 5.1 (Adaptive Reasoning, Max Effort, Default Fallback)Claude Opus 5 (Adaptive Reasoning, Max Effort)
Speed (tok/s)65.8 measured50.4 measured
Blended $/M$7.175 derived$3.85 derived
Intelligence index53.4 measured50.7 measured
TTFT (ms)26814 measured5838 measured
Context1000k list1000k list
Coding index82 measured78 measured
Agentic index58 measured56 measured

Claude Fable 5.1 (Adaptive Reasoning, Max Effort, Default Fallback) card · Claude Opus 5 (Adaptive Reasoning, Max Effort) card · 3D observatory

Verdicts use price×intelligence dominance only, and only where both sides are measured; null cells stay null with their provenance (em-dash = not in catalog). Percentile-free by design — this page compares two models, not the field. Generated page — do not hand-edit.