Anthropic’s recent launch of Claude Fable 5.2 and Mythos 5.2 on November 9, combined with the September 22 release of Opus 5.5, has positioned traders to favor no new Opus 5.6+ before November 30. The flagship Opus line has followed a consistent 6-to-10-week cadence in 2026, placing the current 49-day gap roughly mid-cycle and making a rapid follow-up unlikely without an official preview or system-card update. CEO Dario Amodei’s earlier public call for slower frontier capability gains further supports the market’s 59.5% implied probability on a delayed release, as the company has prioritized efficiency improvements and variant models over immediate Opus iteration. No verified development timelines or regulatory filings point to a November launch, leaving the next plausible window in December.