The amount of software I can create is now mostly limited by inference time and hard thinking. I can ship code now at a speed that seems unreal.

GPT-4 was the unlock for chat, Sonnet 3.5 was the unlock for code, and now Opus 4.5 is the unlock for agents.

Claude Opus 4.5 is the best model currently available. It is the most intelligent and capable, most aligned and thoughtful model. It is a joy.