**OpenAI’s June 2026 launch of the GPT-5.6 family established durable capability tiers—Sol (flagship), Terra (balanced everyday/production model), and Luna (fast/low-cost)—with Terra positioned as GPT-5.5-competitive performance at roughly half the price.** This naming shift, where the number denotes generation and the name a persistent tier that can advance independently, sets expectations for a GPT-5.7+ Terra update. Trader sentiment reflects OpenAI’s rapid subsequent GPT-6 releases (Astra, Sol, Luna) amid U.S. government-requested safety reviews that delayed the 5.6 rollout, plus competitive pressure from Anthropic and efficiency gains in agentic coding and cybersecurity benchmarks. Key upcoming catalysts include further tier-specific updates, regulatory clearance timelines, and any DevDay or earnings signals on development cadence. Market-implied odds favor OpenAI but price in possible delays from safety or competitive shifts.