Anthropic released Claude Opus 5.5, and about an hour later OpenAI released GPT-6 Sol and GPT-6 Luna. GPT-6 Luna is half the price of GPT-5.6 Luna, and GPT-6 Sol saw a similar cut; GPT-6 is half the cost of GPT-5.6’s planned November promotional pricing after a scheduled 25% increase. Grok 4.7’s $2/