check before: 2026-04-01
Product:
Copilot, Copilot Chat, Microsoft 365 Copilot
Platform:
Online, US Instances, Web, World tenant
Status:
Change type:
Admin impact, New feature, Updated message, User impact
Links:
Details:
Summary:
Anthropic Claude Sonnet is now available in Microsoft 365 Copilot for licensed users, accessible in Copilot Chat in Frontier and rolling out across platforms by early April 2026. It’s off by default in EU/EFTA/UK regions, requiring admin opt-in, and not available in Government clouds. Existing data protections remain.
Details:
Updated April 17, 2026: We have updated the content. Thank you for your patience.
[Introduction]
We're expanding model choice in Microsoft 365 Copilot with the addition of Anthropic Claude Sonnet for users with a Microsoft 365 Copilot license. Claude Sonnet is available in Copilot Chat in Frontier, alongside the latest OpenAI models, giving users the flexibility to choose the model best suited for their tasks. This expansion reflects our commitment to delivering the latest AI innovation for work-while maintaining the security, compliance, and privacy standards customers expect from Microsoft.
[When this will happen:]
Frontier availability: Claude Sonnet is available now in Frontier.
General availability (web/desktop/macOS/mobile): Rolling out gradually; expected completion early April 2026 (previously late March).
Change Category:
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Scope:
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Release Phase:
Created:
2026-03-17
updated:
2026-04-18
Task Type
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Docu to Check
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MS How does it affect me
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MS Preperations
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MS Urgency
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MS workload name
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Pictures
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summary for non-techies**
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Direct effects for Operations**
User Experience Disruption
If the Anthropic Claude Sonnet feature is enabled without proper user training or communication, users may experience confusion or frustration when selecting models, leading to decreased productivity.
- roles: End Users, IT Support Staff
- references: https://www.forbes.com/sites/bernardmarr/2023/01/30/the-impact-of-ai-on-user-experience/?sh=5b1c1c1e7c3b
Data Privacy Concerns
Enabling Anthropic Claude Sonnet without thorough understanding of its data processing implications may lead to unintentional data privacy violations, especially in EU regions where data protection laws are stringent.
- roles: Data Protection Officer, Compliance Officer
- references: https://gdpr.eu/what-is-gdpr/
Operational Downtime
If the change is implemented without adequate testing or preparation, it may lead to system instability or downtime, affecting users' ability to access Microsoft 365 services.
- roles: System Administrators, End Users
- references: https://www.techrepublic.com/article/how-to-avoid-downtime-when-implementing-it-changes/
Configutation Options**
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Opportunities**
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Potentional Risks**
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Data Protection**
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IT Security**
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Hypothetical Work Council Statement**
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DPIA Draft**
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explanation for non-techies**
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** AI generated content. This information must be reviewed before use.
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change history
| Date | Property | old | new |
| 2026-04-18 | MC Messages | Updated April 7, 2026: We have updated the timeline. Thank you for your patience.
[Introduction] We're expanding model choice in Microsoft 365 Copilot with the addition of Anthropic Claude Sonnet for users with a Microsoft 365 Copilot license. Claude Sonnet is available in Copilot Chat in Frontier, alongside the latest OpenAI models, giving users the flexibility to choose the model best suited for their tasks. This expansion reflects our commitment to delivering the latest AI innovation for work-while maintaining the security, compliance, and privacy standards customers expect from Microsoft. [When this will happen:] Frontier availability: Claude Sonnet is available now in Frontier. General availability (web/desktop/macOS/mobile): Rolling out gradually; expected completion early April 2026 (previously late March). | Updated April 17, 2026: We have updated the content. Thank you for your patience.
[Introduction] We're expanding model choice in Microsoft 365 Copilot with the addition of Anthropic Claude Sonnet for users with a Microsoft 365 Copilot license. Claude Sonnet is available in Copilot Chat in Frontier, alongside the latest OpenAI models, giving users the flexibility to choose the model best suited for their tasks. This expansion reflects our commitment to delivering the latest AI innovation for work-while maintaining the security, compliance, and privacy standards customers expect from Microsoft. [When this will happen:] Frontier availability: Claude Sonnet is available now in Frontier. General availability (web/desktop/macOS/mobile): Rolling out gradually; expected completion early April 2026 (previously late March). |
| 2026-04-18 | MC How Affect | Who is affected:
Users with a Microsoft 365 Copilot license Who is not affected: Tenants in EU/EFTA and the UK Government clouds (GCC, GCC High, DoD) Sovereign clouds For these tenants, Anthropic models are not available For these tenants, Anthropic models are not available and no model option will be shown. What will happen: Microsoft 365 Copilot licensed users will be able to select Claude Sonnet as an option in the model selector within Copilot Chat. In regions where Anthropic is configured as a subprocessor and is set to Off by default, admins can choose to opt in to make Anthropic models available for their organization. Enterprise Data Protection for Microsoft 365 Copilot continues to apply, with no changes to existing protections. Anthropic operates as a Microsoft subprocessor under the Microsoft Data Protection Addendum and Product Terms. Anthropic models are currently excluded from EU Data Boundary and in-country processing commitments. | Who is affected:
Users with a Microsoft 365 Copilot license Who is not affected: For Government and Sovereign clouds, Anthropic models are not available and will not be visible in the model selector For Tenants in EU/EFTA and the UK Anthropic is off by default and requires opt-in What will happen: Microsoft 365 Copilot licensed users will be able to select Claude Sonnet as an option in the model selector within Copilot Chat. In regions where Anthropic is configured as a subprocessor and is set to Off by default, admins can choose to opt in to make Anthropic models available for their organization. Enterprise Data Protection for Microsoft 365 Copilot continues to apply, with no changes to existing protections. Anthropic operates as a Microsoft subprocessor under the Microsoft Data Protection Addendum and Product Terms. Anthropic models are currently excluded from EU Data Boundary and in-country processing commitments. |
| 2026-04-18 | MC Last Updated | 04/08/2026 00:03:19 | 2026-04-18T01:39:14Z |
| 2026-04-18 | MC Summary | Anthropic Claude Sonnet is now available in Microsoft 365 Copilot Chat in Frontier and rolling out broadly by early April 2026. It offers users with a Copilot license a new AI model choice, except in EU/EFTA, UK, government, and sovereign clouds. Admins can opt in where off by default. | Anthropic Claude Sonnet is now available in Microsoft 365 Copilot for licensed users, accessible in Copilot Chat in Frontier and rolling out across platforms by early April 2026. It’s off by default in EU/EFTA/UK regions, requiring admin opt-in, and not available in Government clouds. Existing data protections remain. |
| 2026-04-08 | MC Messages | [Introduction]
We're expanding model choice in Microsoft 365 Copilot with the addition of Anthropic Claude Sonnet for users with a Microsoft 365 Copilot license. Claude Sonnet is available in Copilot Chat in Frontier, alongside the latest OpenAI models, giving users the flexibility to choose the model best suited for their tasks. This expansion reflects our commitment to delivering the latest AI innovation for work-while maintaining the security, compliance, and privacy standards customers expect from Microsoft. [When this will happen:] Frontier availability: Claude Sonnet is available now in Frontier. General availability (web/desktop/macOS/mobile): Rolling out gradually; expected completion late March 2026. | Updated April 7, 2026: We have updated the timeline. Thank you for your patience.
[Introduction] We're expanding model choice in Microsoft 365 Copilot with the addition of Anthropic Claude Sonnet for users with a Microsoft 365 Copilot license. Claude Sonnet is available in Copilot Chat in Frontier, alongside the latest OpenAI models, giving users the flexibility to choose the model best suited for their tasks. This expansion reflects our commitment to delivering the latest AI innovation for work-while maintaining the security, compliance, and privacy standards customers expect from Microsoft. [When this will happen:] Frontier availability: Claude Sonnet is available now in Frontier. General availability (web/desktop/macOS/mobile): Rolling out gradually; expected completion early April 2026 (previously late March). |
| 2026-04-08 | MC Title | Anthropic Claude Sonnet is now available in Microsoft 365 Copilot | (Updated) Anthropic Claude Sonnet is now available in Microsoft 365 Copilot |
| 2026-04-08 | MC Last Updated | 03/09/2026 23:17:56 | 2026-04-08T00:03:19Z |
| 2026-04-08 | MC MessageTagNames | New feature, User impact, Admin impact | Updated message, New feature, User impact, Admin impact |
| 2026-04-08 | MC Summary | Anthropic Claude Sonnet is now available in Microsoft 365 Copilot for licensed users, except in EU/EFTA, UK, government, and sovereign clouds. It can be selected in Copilot Chat, with rollout completing by late March 2026. Admins may need to opt in where Anthropic is off by default. | Anthropic Claude Sonnet is now available in Microsoft 365 Copilot Chat in Frontier and rolling out broadly by early April 2026. It offers users with a Copilot license a new AI model choice, except in EU/EFTA, UK, government, and sovereign clouds. Admins can opt in where off by default. |
Last updated 16 hours ago ago
