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

OpenAI has introduced two new models, GPT-6 Sol and GPT-6 Luna, while Anthropic has released Claude Opus 5.5. The launches are positioned as lower-cost options and mark both companies' first model releases since calls for an AI development slowdown, but the supplied announcement does not include pricing, availability, context-window limits, or benchmark results. For builders, the model names alone are not enough to support migration decisions. The practical questions are how Sol and Luna differ in speed, reasoning quality, and tool use, and whether Claude Opus 5.5 improves cost per task over Anthropic's existing lineup. Teams should wait for official API documentation, rate limits, independent evaluations, and detailed pricing before changing production workloads.