OpenAI launched the GPT-5.6 family, including the balanced Terra tier, in a limited preview on June 26, 2026, with general availability on July 9 across ChatGPT, Codex, and the API. The models quickly appeared in Text Arena alongside Sol and Luna, enabling community-driven evaluations on text tasks shortly after rollout. Subsequent GPT-6 releases in September 2026, such as Astra and updated Sol/Luna variants, shifted focus to new capability tiers and pricing without referencing a continued 5.x Terra line. This transition, combined with ongoing agentic and benchmark improvements across the lineup, shapes trader views on whether any 5.7+ Terra model would follow the prior Text Arena debut pattern amid evolving OpenAI naming and release cadence.
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