Anthropic Cut Opus Prices and OpenAI Halved Them an Hour Later
Anthropic released Claude Opus 5.5 on September 22 at $4 and $20 per million tokens, about 20% below Opus 5, with cache reads 60% cheaper. About an hour later OpenAI released GPT-6 Sol at $2 and $10, exactly half, and GPT-6 Luna at $0.10 and $0.50.