Anthropic Launches Claude Opus 4.8 With Gains in Coding and Honesty Thursday May 28, 2026 11:29 am PDT by Juli Clover Anthropic today announced the launch of its latest AI model, Claude Opus 4.8. …
… Big gains: ~5 pts in agentic coding and ~8+ pts in agentic terminal coding. …
… Anthropic claimed in the announcement that Opus 4.7 is measurably more honest than its predecessor, and scored a 91.7% on the MASK honesty benchmark, whereas Opus 4.6 scored 90.3%. This makes it very clear that honesty on a benchmark and honesty in practice are two very different things. …
… 01 / 11 One of the most prominent improvements in Opus 4.8 is its honesty . …
… Opus 4.7 is a notable improvement on Opus 4.6 in advanced software engineering, with particular gains on the most difficult tasks. Users report being able to hand off their hardest coding work—the kind that previously needed close supervision—to Opus 4.7 with confidence. …
… We're seeing efficiency gains across the value-chain. …
… Explicit honesty requirements. …