GPT-6 Sol and Luna cost half as much as GPT-5.6

TL;DR

• GPT-6 Sol costs $2 per million input tokens and $10 per million output, half the GPT-5.6 Sol price; Luna costs $0.10 and $0.50, down from $0.20 and $1.20.
• Both have a 1,050,000-token context window, write up to 128,000 tokens in one reply, and are in the API as gpt-6-sol and gpt-6-luna.
• OpenAI says Sol makes about half as many mistakes as its predecessor on its own factuality test, and that cached input reads are 90% off.