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. …
Anthropic is releasing Claude Opus 4.8 on Thursday, and the company is touting the model’s “honesty.” According to Anthropic, it trains “all its models to be honest — for instance, to avoid making claims that they can’t support.” But it notes that “a general problem with AI models is that they some… …
… The most notable upgrades are in agentic coding with almost a 5 percentage point increase in capabilities and in agentic terminal coding with over an 8 percentage point increase . Remember, Claude Opus 4.7 came out mid-April, and Anthropic is already serving up a new version with big improvements. …
… 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. …
… Claude Code extra and max performance efforts Claude Opus 4.8 will use high effort by default, which Anthropic says spends similar tokens to Opus 4.7 on coding tasks with better performance. …
… 01 / 11 One of the most prominent improvements in Opus 4.8 is its honesty . …
… On our 93-task coding benchmark, Claude Opus 4.7 lifted resolution by 13% over Opus 4.6, including four tasks neither Opus 4.6 nor Sonnet 4.6 could solve. Combined with faster median latency and strict instruction following, it’s particularly meaningful for complex, long-running coding workflows. …
… The model is excellent at coding, reasoning about biology, and understanding scientific figures. …
… Precision and instruction following A compliance question wrapped up in a coding one Up until now, the prompts have mostly let the LLMs figure out how to proceed. …
… Explicit honesty requirements. …