Washington — Artificial intelligence represents a mixed blessing for the legal field, U.S. Supreme Court Chief Justice John Roberts said in a year-end report published Sunday, urging “caution and humility” as the evolving technology transforms how judges and lawyers go about their work. Roberts struck an ambivalent tone in his 13-page report. He said AI had potential to increase access to justice for indigent litigants, revolutionize legal research and assist courts in resolving cases more quickly and cheaply while also pointing to privacy concerns and the current technology’s inability to replicate human discretion. “I predict that human judges will be around for a while,” Roberts wrote. “But with equal confidence I predict that judicial work – particularly at the trial level – will be significantly affected by AI.” The chief justice’s commentary is his most significant discussion to date of the influence of AI on the law — and coincides with …