Claude Sonnet 4.6 (Adaptive Reasoning, Max Effort) vs GPT-5.5 (low)

Anthropic · OpenAI · catalog 2026-09-14

Trade-off: Claude Sonnet 4.6 (Adaptive Reasoning, Max Effort) is cheaper ($2.31 vs $4.35/M); GPT-5.5 (low) scores higher on intelligence (30.7 vs 30.5).

	Claude Sonnet 4.6 (Adaptive Reasoning, Max Effort)	GPT-5.5 (low)
Speed (tok/s)	53.6 measured	82.3 measured
Blended $/M	$2.31 derived	$4.35 derived
Intelligence index	30.5 measured	30.7 measured
TTFT (ms)	10824 measured	17 measured
Context	—	—
Coding index	63 measured	61 measured
Agentic index	not measured for both

Claude Sonnet 4.6 (Adaptive Reasoning, Max Effort) card · GPT-5.5 (low) 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.