Claude Opus 4.8 Gets Honesty Upgrade to Flag Uncertainties

Claude Opus 4.8 now flags uncertainties and avoids unsupported claims, making it more transparent about knowledge gaps. Anthropic trained the model to admit when it doesn't know answers instead of fabricating responses. This upgrade increases truthfulness by reducing hallucinations, especially in cases where data is incomplete. The change addresses growing criticism of AI models that prioritize engagement over accuracy. Users may still face misinformation, but the model now explicitly signals when answers are speculative. This transparency helps developers and users assess response reliability, especially in sensitive or high-stakes applications.