๐ข Just shippedGA 2026-09-04
GPT-6 Astra joins the frontier models in Copilot Cowork and Copilot Studio, aimed at delegating larger tasks rather than guiding work step by step, with Work IQ grounding it in files, meetings, chats and business data inside existing permissions. Availability may vary by region and organization, and admins manage access and configure availability through the Microsoft 365 admin center.
Why it matters: Model choice for delegated work moves both cost and output quality, and the region and organization variability means availability has to be verified per tenant before it is promised to a customer.
techcommunity.microsoft.com
๐ข Just shippedGA 2026-09-02
Claude Fable 5.1 joins the frontier models in Copilot Cowork and Copilot Studio, described as built for long-running work, financial analysis and front-end visual coding, with tighter up-front plans and more concise closing summaries. It rolls out to eligible users only, availability may vary by region and organization, and admin access control runs through the AI subprocessor connection setting.
Why it matters: Two frontier models landed in the same surfaces within three days, so model selection guidance written before September is already out of date.
techcommunity.microsoft.com