OpenAI Ships GPT-6 Sol and Luna at Half the Cost of 5.6 Series, Says Sol Cuts Mistakes in Half

OpenAI launched GPT-6 Sol and Luna on Tuesday, priced at half the GPT-5.6 tier ($2/$10 per million tokens for Sol vs. $4/$20 previously) and positioned as 'cut from the same cloth' as flagship Astra. Sol is aimed at complex coding while Luna targets high-volume clerical work; OpenAI says Sol makes about half as many mistakes as its predecessor on internal factuality evals, reaching Astra-level reliability. The drop landed roughly 90 minutes after Anthropic released Claude Opus 5.5, with OpenAI claiming both models beat Fable and Opus on many tasks.