Grok 4.1 Achieves 65% Hallucination Reduction with Agent Tools API; Grok 5 Targets 6T Parameters

xAI confirmed Grok 4.1 availability across grok.com, the X platform, and iOS/Android apps, with the model achieving a 65% hallucination reduction — dropping error rates from 12.09% to 4.22%. New developer capabilities include the Agent Tools API, Remote MCP Tools, Grok Voice, and Files API for building sophisticated agentic applications. Elon Musk separately stated that honest user feedback is Grok's primary development goal, with 'honest versions' maintained during training to eliminate 'bad transformers.' Grok 5, targeting 6 trillion parameters with native multimodal and video understanding, was originally scoped for Q1 2026 but has not yet shipped.