Cost per Task on FrontierCode spans two orders of magnitude, from $0.09 for GPT-6 Luna (max) to $12.00 for Claude Fable 5.1 (max with fallback). Four models sit on the Pareto frontier for score vs. Cost per Task: GPT-6 Luna (max) at 42% and $0.09 per task, MiMo-V2.6-Pro at 45% and $0.18, GPT-6.1 Sol (max) at 49% and $0.81, and Claude Opus 5.5 (max with fallback) at 52% and $10.15.

GPT-6 models led on token efficiency in our testing. GPT-6 Astra (max) and GPT-6.1 Sol (max) averaged 27k and 33k output tokens per task respectively, compared with 157k for Claude Opus 5.5 (max with fallback) and 236k for Claude Sonnet 5.5 (max with fallback).