Anthropic dropped Claude Opus 4.8 yesterday, May 28. Same playbook as the last few releases. No waitlist, no staged rollout. It showed up in Claude Code, the API, and the major cloud providers on the same day, with the model ID claude-opus-4-8 ready to drop into existing config.
I have been running Opus 4.7 as my default coding model since it launched in April. It handled my agentic coding sessions, my content pipeline, and most of my production debugging. So the first thing I did with 4.8 was throw the exact same hard tasks at it that I used to stress-test 4.7, then dig into the official announcement to separate the real changes from the launch-day polish.
Here is what I found after a day of hands-on use.
The Headline: It Stopped Lying to Me About My Code
The benchmark Anthropic led with is not a coding score or a reasoning score. It is honesty. Opus 4.8 is roughly 4x less likely than 4.7 to let a code flaw pass unremarked.
