OpenAI Launches GPT-6 Sol and Luna, Cuts API Prices in Half, 90 Minutes After Anthropic's Opus Update
OpenAI released two cheaper GPT-6 models, Sol and Luna, on September 22, cutting API prices 50% from GPT-5.6 promotional rates and claiming Sol makes half as many mistakes as its predecessor. The accuracy numbers come entirely from OpenAI's own internal testing, with no independent verification yet, and the launch landed roughly 90 minutes after Anthropic shipped an update to Opus 5.5.