Claude 3.5 Opus is no longer mentioned at all on https://docs.anthropic.com/en/docs/about-claude/models
Internet Archive confirms that on the 8th of October that page listed 3.5 Opus as coming "Later this year" https://web.archive.org/web/20241008222204/https://docs.anth...
The fact that it's no longer listed suggests that its release has at least been delayed for an unpredictable amount of time, or maybe even cancelled.