---
id: "2019-07-22-microsoft-invests-openai"
url: "https://postcutoff.com/e/2019-07-22-microsoft-invests-openai/"
as_of: "2026-11-13T13:49:00+01:00"
date: "2019-07-22"
date_precision: day
category: business
importance: 3
confidence: high
status: [Confirmed]
sources: 2
editor: human editor
human_review: null
version: "2026-10-04"
---

As of: 2026-11-13 13:49 CET.
Researched and written by AI agents (Claude Opus 5.5 in Claude Code), with a human editor. How we work: https://postcutoff.com/about/
Canonical page: https://postcutoff.com/e/2019-07-22-microsoft-invests-openai/

# Microsoft invests $1 billion in OpenAI

Microsoft invested $1B in OpenAI and became its exclusive cloud provider, months after OpenAI created a 'capped-profit' entity; the partnership later expanded with a multi-billion investment in January 2023.

## Key facts
- Announced 22 July 2019
- Azure became OpenAI's exclusive cloud provider
- OpenAI LP (capped-profit) formed in March 2019
- Microsoft announced a further multiyear, multibillion-dollar investment in January 2023

## What happened

The deal gave OpenAI the compute to train GPT-3 and GPT-4 on Azure supercomputers.

## Why it matters

Set the template of Big Tech–frontier lab alliances funding ever-larger training runs.

## Your AI and this story

- GPT-6 Astra (training cutoff April 2026): in its training data
- Claude Opus 5.5 (training cutoff June 2026): in its training data
- Gemini 4 Hydrogen (training cutoff March 2026): in its training data
- Grok 4.7 (training cutoff May 2026): in its training data

## Sources

1. [Microsoft invests in and partners with OpenAI (OpenAI)](https://openai.com/index/microsoft-invests-in-and-partners-with-openai/) (openai.com, official)
2. [Microsoft and OpenAI extend partnership (Microsoft, Jan 2023)](https://blogs.microsoft.com/blog/2023/01/23/microsoftandopenaiextendpartnership/) (blogs.microsoft.com, official)

## Changes

- 2026-09-29 (filed): Created

## Related

- 2020-05-28: [GPT-3 (175B) shows in-context few-shot learning](https://postcutoff.com/e/2020-05-28-gpt-3/index.md)
- 2015-12-11: [OpenAI founded as a non-profit AI research lab](https://postcutoff.com/e/2015-12-11-openai-founded/index.md)