Today, Anthropic released Claude Opus 4.5, and it’s available now in Microsoft Copilot Studio. Opus 4.5 brings sharper reasoning, stronger long-context handling, and improvements in multi-step tasks. Additionally, Opus 4.5 is coming to public preview in Microsoft Foundry.
For anyone building agents in Copilot Studio, we know that model choice enables you to solve your unique business problems and realize continuous improvement in agent performance. That’s why in the past 60 days, we’ve enabled major models like GPT-5, GPT-5.1, Claude Sonnet 4.5 and Claude Opus 4.5 in Copilot Studio on the same day as their public release. And with new Copilot Studio platform capabilities like agent evaluations, we’re making it even easier to test your agent with multiple models to find the right fit.
Hear directly from the team on how we are enabling model choice across Copilot Studio and Microsoft 365 Copilot:
Claude Opus 4.5 will replace Claude Opus 4.1 in Copilot Studio as an experimental model. As with any experimental model, we encourage testing it in non-production scenarios. To use Anthropic models in Copilot Studio, admins must opt in via the Microsoft 365 Admin Center. You can learn more about doing so here. If you have already opted into using Anthropic models in your tenant, there’s no action required.
You can learn more about Claude Opus 4.5 from Anthropic’s launch announcement.
