Microsoft and OpenAI sign a new definitive agreement
Investment and partnership · Announced Oct 28, 2025 · Expanded
Microsoft and OpenAI sign a new agreement that restates their long-term partnership as OpenAI changes its structure.
The companies
Every Microsoft and OpenAI deal| Company | Role | Website |
|---|---|---|
| Microsoft | Investor | microsoft.com |
| OpenAI | Partner | openai.com |
Source
Related partnerships
| Date | What | |||
|---|---|---|---|---|
| Apr 27Apr 27, 20262026 | Microsoft | OpenAI | Microsoft and OpenAI amend their agreement | OpenAI |
| Sep 16Sep 16, 20262026 | OpenAI |  Salesforce | Salesforce Expands Missionforce with Purpose-Built AI and New Partnership with OpenAIunverified | salesforce.com |
| Sep 16Sep 16, 20262026 | Salesforce | OpenAI+1 | Salesforce Missionforce adds OpenAI and Nvidia | Salesforce newsroom |
| Aug 11Aug 11, 20262026 | OpenAI |  AWS | OpenAI Daybreak security models on Amazon Bedrock | OpenAI |
| Jun 28Jun 28, 20262026 |  HP Inc. | OpenAI | HP and OpenAI: Frontier strategic partnership | OpenAI |
| Jun 1Jun 1, 20262026 | OpenAI | AWS | OpenAI frontier models and Codex on AWS | OpenAI |
About this partnership
- Announced
- Oct 28, 2025
- Status
- Expanded
- Scope
- Equity, model access and Azure
- Value
- Not stated
Sources: each company's own announcement (newsroom, blog or press release), read every weekday at 07:15 UTC. New finds stay marked Unverified until checked by hand. Logos via logo.dev; trademarks belong to their owners.