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20262020s
GPT-5.6 Public Release
OpenAI publicly released the GPT-5.6 family (Sol, Terra, Luna) on July 9, 2026, after an initial government-requested limited rollout, alongside the GPT-Live full-duplex voice models.
Why It Mattered
GPT-5.6 arrived in three tiers — the flagship Sol with an 'ultra' mode that delegates work to submodels, the balanced Terra, and the fast Luna — and its staged rollout at the U.S. government's request highlighted deepening state involvement in frontier deployment. The simultaneous GPT-Live-1 voice models introduced full-duplex conversation, speaking and listening at the same time to enable natural interruption and live translation, and OpenAI paired the launch with its ChatGPT Work tool for enterprise workflows.
Who Built It
OpenAI
Applications
- General Assistance
- Voice AI
- Enterprise Work