**Anthropic’s Claude Fable series drives the market, with Fable 5 launching in June 2026 and Fable 5.1 following on September 1.** Trader sentiment centers on leaks from X accounts in early September citing a completed pretraining run and a late-September to early-October window for 5.2 or higher, alongside reports of gray-route testing and model routing shifts in Claude Code and apps. Competitive pressure from models like OpenAI’s GPT-6 Astra and Zhipu’s GLM-5.2, plus Anthropic’s pattern of frequent frontier updates, supports elevated odds for a near-term release. Markets currently imply roughly 40% chance by mid-October and 80% by month-end, with resolution hinging on an official announcement or confirmed API availability meeting the 5.2+ threshold.