Claude Opus 5.5, GPT-6 Sol, GPT-6 Luna, and a new price war

Multiple AI companies released new models on September 22, 2026: Anthropic released Claude Opus 5.5, and OpenAI released GPT-6 Sol and GPT-6 Luna, with GPT-6 Luna priced at half the cost of its GPT-5.6 predecessor, triggering competitive pricing across the AI model market. Claude Opus 5.5 received a 20% price reduction and improved communication style, though it experienced a failure when set to maximum reasoning level on an SVG generation test. The price reductions have intensified competition, particularly affecting lower-tier models like Haiku, which now faces pricing pressure from GPT-6 Luna.