Incorrect display of 'Legacy Model' on Claude.ai for conversations with Opus 4

Incident Report for Anthropic

Resolved

We have identified an issue which resulted in some conversations with Claude Opus 4 showing a 'Legacy Model' in the selector, and resulting in Opus being unavailable to selected to continue the conversation. This issue has been resolved.

Posted May 23, 2025 - 17:46 PDT

This incident affected: claude.ai.