Anthropic and OpenAI roll out cheaper models in first release since call for slowdown

Anthropic and OpenAI on Tuesday each announced new, less costly artificial intelligence models as both frontier labs continue to face stiff competition from cheaper, open-weight competitors. OpenAI introduced additional tiers to its GPT-6 family, with GPT-6 Sol and GPT-6 Luna, slashing the API prices by 50% compared with GPT-5.6 promotional pricing. Sol, which is a tier below Astra, is meant for more complex workloads like coding, while the company's Luna offering is geared toward "high-volume tasks" like extracting information or summarizing documents, the company wrote. Anthropic unveiled Claude Opus 5.5 on Tuesday, its latest release in the new Claude 5.5 model family.