Anthropic’s recent release of Claude Fable 5.1 on September 1 has set the stage for trader focus on a follow-on 5.2+ model, with leaks from early September citing a completed pretraining run and a targeted window of late September or early October. No official announcement, model card, or API identifier has appeared as of early October, leaving market-implied odds sensitive to any credible reporting on internal progress or competitive pressure from peers like OpenAI. A qualifying public release must include “Fable” in the name, reach version 5.2 or higher, and become generally available rather than limited to closed beta or vetted partners. Key near-term catalysts include Anthropic’s next developer communications, benchmark updates, or visible routing changes in Claude Code that could signal an imminent launch.