Anthropic and OpenAI cut listed API prices with new model releases

Anthropic and OpenAI announced new models on Sept. 22 with lower listed API prices. Anthropic lists Claude Opus 5.5 at $4 per million input tokens and $20 per million output tokens, while OpenAI lists GPT-6 Sol at $2 and $10 and GPT-6 Luna at $0.10 and $0.50. Anthropic says its tests show lower typical-workload costs for Opus 5.5; OpenAI positions Sol for complex coding and agents and Luna for focused, high-volume tasks. Those performance and cost comparisons come from the companies, not one independent test.