Answer · Enterprise Platforms
What AI models does Microsoft 365 Copilot use?
Microsoft 365 Copilot runs on Anthropic (as subprocessor option) (Anthropic), Anthropic (subprocessor opt-in) (Anthropic), Anthropic (subprocessor optional) (Anthropic), Anthropic (unspecified model) (Anthropic), Anthropic Claude (Anthropic), Anthropic Models (Anthropic), Claude (Anthropic as subprocessor opt-in) (Anthropic), Claude 3 Opus (Anthropic), Claude 3.5 Sonnet (Anthropic), GPT-4o (OpenAI), GPT-5 class (OpenAI), Microsoft Copilot (Microsoft) and Phi (Microsoft), and routes requests between them.
- Models used
- 13
- Primary model
- Anthropic (subprocessor opt-in)
- Public API
- Yes
- Last checked
- 2026-11-07
Model claims are labelled by how we know them: Anthropic (as subprocessor option) — unknown, Anthropic (subprocessor opt-in) — disclosed, Anthropic (subprocessor optional) — unknown, Anthropic (unspecified model) — inferred, Anthropic Claude — disclosed, Anthropic Models — disclosed, Claude (Anthropic as subprocessor opt-in) — inferred, Claude 3 Opus — inferred, Claude 3.5 Sonnet — inferred, GPT-4o — inferred, GPT-5 class — disclosed, Microsoft Copilot — unknown and Phi — disclosed. "Disclosed" means the vendor says so in public; "inferred" means it was derived from documentation, headers or release notes.
Context window: 128K.
Other stack signals: Anthropic.
Cite this answer
Tomorrow. “What AI models does Microsoft 365 Copilot use?” Tomorrow AI & Emerging Tech Index, AlienSquad, updated 2026-11-07. https://tomorrow.aliensquad.ai/q/what-models-does-microsoft-365-copilot-use
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