Claude Sonnet 5 (Adaptive Reasoning, Low Effort) vs GPT-5.1 (high)

Anthropic · OpenAI · catalog 2026-09-14

GPT-5.1 (high) beats Claude Sonnet 5 (Adaptive Reasoning, Low Effort): cheaper ($1.341 vs $1.54/M) and at least as smart (index 24.7 vs 24.7).

	Claude Sonnet 5 (Adaptive Reasoning, Low Effort)	GPT-5.1 (high)
Speed (tok/s)	55.8 measured	99.5 measured
Blended $/M	$1.54 derived	$1.341 derived
Intelligence index	24.7 measured	24.7 measured
TTFT (ms)	106 measured	3377 measured
Context	—	400k list
Coding index	not measured for both
Agentic index	not measured for both

Claude Sonnet 5 (Adaptive Reasoning, Low Effort) card · GPT-5.1 (high) 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.