OpenAI’s GPT-5.6 Terra reached general availability on July 9, 2026, after a limited preview and U.S. government safety review, delivering GPT-5.5-level performance at roughly half the cost with a 1M context window. Since then, the company has shifted focus to the GPT-6 family, releasing variants including GPT-6 Astra and GPT-6.1 Sol by early October, which incorporate intelligent UI features and further efficiency gains. Competitive pressure from Anthropic’s Mythos series and internal cadence of tiered releases (Sol flagship, Terra balanced, Luna low-cost) continue to shape expectations for when a 5.7+ Terra update might arrive, with traders watching developer conferences, API pricing changes, and any new regulatory reviews for timing signals.