Claude Opus 4.8 Arrives with Two Historic Firsts: Zero Lie Rate and Zero Lazy Rate
Claude Opus 4.8, released just 43 days after 4.7 at the same price, tops the GDPval‑AA leaderboard with 1890 Elo, beats GPT‑5.5 by 121 points, cuts steps by 15% and tokens by 35%, achieves a perfect 0% lie and lazy rate, dominates SWE‑Bench, ProgramBench and FrontierSWE, and introduces massive parallel agent workflows that can rewrite 750 k lines of production code in 11 days, while Anthropic prepares the upcoming Claude Mythos and celebrates a $965 b valuation.
