Claude Opus 4.8 — Title Only Edit

Anthropic released Claude Opus 4.8, describing it candidly as a "modest but tangible" improvement over its predecessor. The headline gain is honesty: Anthropic reports Opus 4.8 is roughly 4× less likely than its predecessor to let flaws in its own code pass unremarked, and the system card shows it has the lowest incorrect-rate across six models on every hallucination benchmark — achieved primarily by abstaining when uncertain rather than answering more questions correctly. Anthropic also signaled that lower-cost Opus-class models are next on the roadmap.