AsOf

Claude Opus 4.8 · predecessorOpus 4.7

validasserted
Valid from
2026-05-28
Valid until
still holds
Published
no source on record carries a date
Recorded by AsOf
2026-11-04
Checked
2026-11-04 · its source page states the value and the date
Confidence
0.95

Sources

“May 28, 2026 Claude Opus 4.8 launch We’ve upgraded Claude Opus to a new version. Claude Opus 4.8 shows improvements over Opus 4.7 in coding, agentic skills, reasoning, and practical knowledge work tasks.”— what the page says, read 2026-11-04