Anthropic and OpenAI launch new models on the same day and cut their prices
On Tuesday 22 September, Anthropic presented Claude Opus 5.5, which it describes as its best-performing model to date, on par with its top-tier Fable 5.1 for roughly 40% less than Opus 5 and 30% faster, TechCrunch reports. A few minutes later, OpenAI rounded out its GPT-6 range with Sol and Luna, two models less powerful than Astra but built to cost less, along with an improved prompt cache (the reuse of instruction chunks already processed). Numerama points to the paradox: both companies had called, a few days earlier, for a slower AI race. The real surprise is the pricing, which both camps lower at the same time. The day before, SpaceXAI had released Grok 4.7, judged disappointing on performance but cheaper than its rivals.

