GPT-6 Sol vs Luna vs Astra: choose a model for your task

Published Sep 23, 2026. Direct OpenAI Standard rates: Luna $0.10/$0.50, Sol $2/$10, Astra $10/$50 per MTok. Sol input/output prices are 20× Luna’s; Astra 5× Sol’s.

GPT-6 Sol and Luna build on Astra alignment advances with 50% lower API prices vs GPT-5.6 promotional pricing.