DeepSeek beat Sonnet

September 18, 2026

DeepSeek V4.1 Flash beat Sonnet 5 on pricing and quality for this coding task. It scored 86 out of 100 against 51, for about $0.50 to $1 of API cost against $3 to $5.

A table scoring Sonnet 5 and DeepSeek V4.1 Flash across eleven areas like feature completeness and accessibility, with totals of 51 and 86.