Claude Fable 5 (Adaptive Reasoning, Max Effort, Opus 4.8 Fallback) vs Claude Opus 5 (Adaptive Reasoning, Xhigh Effort)

Anthropic · Anthropic · catalog 2026-09-14

Claude Opus 5 (Adaptive Reasoning, Xhigh Effort) beats Claude Fable 5 (Adaptive Reasoning, Max Effort, Opus 4.8 Fallback): cheaper ($3.85 vs $7.7/M) and at least as smart (index 49.7 vs 49.7).

	Claude Fable 5 (Adaptive Reasoning, Max Effort, Opus 4.8 Fallback)	Claude Opus 5 (Adaptive Reasoning, Xhigh Effort)
Speed (tok/s)	66.8 measured	49.3 measured
Blended $/M	$7.7 derived	$3.85 derived
Intelligence index	49.7 measured	49.7 measured
TTFT (ms)	8141 measured	2202 measured
Context	1000k list	—
Coding index	77 measured	77 measured
Agentic index	51 measured	56 measured

Claude Fable 5 (Adaptive Reasoning, Max Effort, Opus 4.8 Fallback) card · Claude Opus 5 (Adaptive Reasoning, Xhigh 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.