"The push started back in September, when Microsoft first added support for Claude, but on Jan. 7, things took a big step forward: for most business customers (outside of certain regions like the EU, U.K., and European Free Trade Association, where administrators have to opt in), Claude models became turned on by default. This means many companies now automatically get access to Claude's strengths without any extra setup."
"For example, Claude Sonnet 4.5 shows noticeable advantages in tricky Excel tasks. Reports suggest it performs about 15% better than GPT-4o in "Agent Mode" for things like building complex financial models or spotting errors across multiple spreadsheets. Claude Opus 4.1 handles super-long context - up to 500,000 tokens - making it great for summarizing massive piles of company documents, reports, or legal files, something earlier GPT versions struggled with."
Microsoft is set to spend roughly $500 million per year on Anthropic AI models and has integrated Claude across its productivity ecosystem, including Microsoft 365 Copilot. Claude was first supported in September and, as of Jan. 7, is turned on by default for most business customers except in regions requiring opt-in like the EU, U.K., and EFTA. A November partnership with Nvidia and Anthropic expanded Claude access on Azure and made Anthropic a heavy Azure user. Microsoft continues major investments in OpenAI but routes tasks to the best-performing model. Claude Sonnet 4.5 excels at complex Excel work, and Claude Opus 4.1 supports contexts up to 500,000 tokens for large-document summarization.
Read at 24/7 Wall St.
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