Claude Opus 5.5 and GPT-6 Sol/Luna launch on the same day, kicking off a new price war

Claude Opus 5.5 与 GPT-6 Sol/Luna 发布，Simon Willison 详解新一轮价格战

Simon Willison compares three models launched on the same day. GPT-6 Luna drops to $0.10/M input tokens—half the price of GPT-5.6 Luna and one of OpenAI's cheapest models ever. GPT-6 Sol also halves its predecessor's price. Claude Opus 5.5 gets a 20% cut but still costs twice as much as GPT-6 Sol. In testing, Opus 5.5 at max thinking level over-thinks to the point of hitting its 128k output limit, failing to produce even a simple pelican SVG. Each failed attempt cost $2.56 and took nearly 20 minutes. Willison calls the max mode effectively useless.

Why it matters: Three flagship models dropped on the same day, with Simon Willison's first-hand pricing comparison and early impressions. GPT-6 Luna at $0.10/M input is OpenAI's cheapest ever, directly reshaping the cost structure for application builders. Downside: the post only has the pric...