GPT-5.3 released by...? is a active prediction market event on Polymarket with 5 markets, $2.9M total volume, and $1.6M in liquidity. Key markets: GPT-5.3 released by February 28, 2026?; GPT-5.3 released by March 31, 2026?; GPT-5.3 released by February 20, 2026?.