Claude Opus 5 Is Live: The Model ID Changes, Effort-Based Cost Curve, and Routing Decision Every Operator Must Know
Anthropic shipped claude-opus-5 yesterday with adaptive thinking on by default — which means thinking tokens bill as output tokens even when you never see them. Here is the routing policy update for teams coming from Opus 4.8 on Claude API, Bedrock, and Vertex.
via Anthropic