Anthropic’s release cadence for the Claude Fable line, with point updates such as 5.1 following the July 2026 debut of Fable 5 within roughly twelve weeks, underpins the tight spread in Polymarket odds for a 5.2+ launch. The absence of any official announcement, model card, or credible leak as of early November 2026 leaves traders relying on historical patterns and competitive pressure from other frontier labs, producing closely matched probabilities across November 10–18. This uncertainty is amplified by the lack of demonstrated capabilities or internal signals that typically precede Anthropic deployments, while the 16.5% chance of no release by November 30 reflects the possibility of further delays common in large-language-model timelines.