Anthropic Forces Popular AI Agent Tool to Rebrand, and Its Users Are Discovering Open-Source Alternatives That Beat Opus 4.5

Anthropic's trademark enforcement against ClawdBot — now renamed Moltbot — collided with the launch of Kimi K2.5, an open-source model that multiple users claim outperforms Opus 4.5, creating a narrative inflection point for the open-source agent ecosystem.