OpenAI launches GPT-6 Sol and Luna with API prices cut in half

Summary

OpenAI has expanded its GPT-6 family with the mid-tier Sol and Luna models, trained with the same methods as the flagship Astra. The company cut API prices by 50% versus GPT-5.6 promotional pricing, citing better caching and inference (Sol: $2 input and $10 output per million tokens; Luna: $0.10 and $0.50). On OpenAI's internal factuality evaluation, based on real-world conversations where users flagged mistakes, GPT-6 Sol reportedly makes about half as many errors as its predecessor. The models are rolling out to ChatGPT Work, Codex, and the API, with Luna also reaching the desktop app and free-tier users.

Why it matters for our work

Getting near-frontier model quality at half the price lowers the cost barrier for running coding agents and routine-work automation at scale, so teams can iterate more and delegate a wider range of tasks to AI. Performance figures are OpenAI's own claims, not independently verified.

Translated from the Korean original. Summaries may be translated and edited. Commentary reflects our perspective; forecasts remain the source’s views.