Report: Microsoft taps rival Anthropic’s AI for Office after it beats OpenAI at some tasks

Microsoft is set to enhance its Office 365 suite by incorporating AI models from Anthropic, marking a significant shift from its exclusive partnership with OpenAI. According to a report from The Information, this change comes after internal evaluations showed that Anthropic's Claude Sonnet 4 model outperforms OpenAI's offerings in certain Office tasks, particularly in areas like visual design and spreadsheet automation. This strategic integration is not merely a negotiating tactic, as emphasized by sources familiar with the situation. Instead, it highlights the complexities of alliances within the AI sector. Microsoft plans to access Anthropic's models through Amazon Web Services, which is both a competitor in cloud computing and a key investor in Anthropic. An official announcement regarding this integration is anticipated within a few weeks, with subscription prices for Office's AI tools expected to remain stable. Microsoft has reassured that its relationship with OpenAI is still strong, with a spokesperson stating, "OpenAI will continue to be our partner on frontier models, and we remain committed to our long-term partnership." To date, Microsoft has invested over $13 billion in OpenAI and is currently in discussions to secure ongoing access to its models. This collaboration, which began in 2019, has given Microsoft a competitive advantage in deploying AI-driven features in its software ecosystem, including Bing and Copilot assistants. However, a recent UK government study revealed that there was no significant productivity increase among users of Copilot AI in their daily work activities.