Anthropic ships Claude Fable 5.1, more than doubling predecessor on key benchmark in latest AI model release.

Polymarket opens bet on OpenAI Astra release week via poly.market/1w5SiLE, letting traders profit from AI launch timing on its prediction market.

Polymarket bettors give Anthropic's Claude 5 a 57% chance of launching this month, signaling intense AI competition in 2026.