Polymarket Opens Prediction Market on Claude Fable 5.2 Release as Gray Testing Shows Reasoning Leaps

Polymarket has launched a prediction market on when Anthropic will publicly release Claude Fable 5.2 or higher, with traders betting heavily on a December 31, 2026 release despite ongoing gray testing of the unreleased model. The market has generated $51,103 in trading volume since opening on October 2, with December 31 commanding 98.7% of current odds, followed by October 31 at 93%.