Anthropic has launched Claude Opus 4.8, emphasizing improved honesty by admitting uncertainty and reducing AI costs with features like cheaper fast mode and Effort Control.

Anthropic releases Claude Opus 4.8 with sharper judgement and fewer uncaught code flaws. Mythos-class models coming in weeks. Series H raises $65B at $965B valuation.

Anthropic's latest flagship AI model Claude Opus 4.8 arrives with sharper reasoning, tighter alignment, and a price tag that hasn't budged.

Anthropic says Opus 4.8 is “more likely to flag uncertainties.”

A Mythos-class model is expected in the coming weeks.