OpenAI says GPT 5.6 is the 'preferred model' for Microsoft Copilot 365 amid breakup chatter
OpenAI's GPT-5.6 family (Sol, Terra, and Luna) became generally available across ChatGPT, ChatGPT Work, Codex, and the API, with Sol targeting demanding agentic and reasoning workloads. OpenAI said GPT-5.6 is now the 'preferred model' powering Microsoft 365 Copilot, pushing back on reports that Microsoft was shifting Word and Excel to its own in-house MAI models.
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