Google’s Gemini 3.5 Pro flagship, positioned as the company’s top reasoning and coding model, remains unreleased following internal performance shortfalls that prompted a delay after the May 2026 I/O launch of 3.5 Flash. Recent July releases of 3.6 Flash, 3.5 Flash-Lite, and specialized variants have instead emphasized efficiency gains and agentic benchmarks while the Pro tier—last updated as 3.1 Pro in February—continues to lag behind internal targets. Traders are monitoring DeepMind’s ability to close the capability gap amid competition from other frontier labs, with any breakthrough in long-horizon reasoning or multimodal benchmarks likely to accelerate a Pro rollout and shift market-implied odds.