Microsoft 365 Copilot adds GPT-6 Astra and Claude Fable – requires credits
Microsoft 365 Copilot is being expanded with the advanced GPT-6 Astra and Claude Fable 5.1 models in November 2026. The models are not included in the base licence and are charged via separate Copilot Credits.
What happened?
Microsoft is adding two new AI models, OpenAI’s GPT-6 Astra and Anthropic’s Claude Fable 5.1, to the model selector for Microsoft 365 Copilot. The models will be available in Copilot Chat as well as Word, Excel and PowerPoint from the beginning of November 2026. Unlike previous integrated models, they are not covered by the Microsoft 365 Copilot base licence and require payment via separate Copilot Credits.
Key facts
Why it matters
The structure represents a shift toward usage-based pricing for the most advanced AI models within Microsoft’s enterprise suite. Previously, access to models was included in the fixed monthly fee per user, but the new high-end models now require a separate credit pool. This means that organisations must budget for variable costs in addition to the standard licence fee.
Who is affected?
The change affects companies and organisations that use Microsoft 365 Copilot and wish to leverage the latest models from OpenAI and Anthropic. Administrators and IT departments will need to manage the purchase and allocation of Copilot Credits for users who require access to these models.
What else you should know
The rollout begins in early November 2026 and is expected to be completed by the middle of the same month. The models are integrated both in standalone Copilot Chat and directly into the Office applications Word, Excel and PowerPoint.
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