Date

Event

December 11, 2015

Tech executives including Elon Musk and Sam Altman announce the launch of OpenAI, pouring in $1 billion to create the AI firm

2018

OpenAI announces that Musk is leaving its board

2019

OpenAI creates for-profit arm to help raise funds from investors

Nov. 17, 2023

OpenAI board fires CEO Altman and President Greg Brockman quits. Mira Murati named as interim CEO

Nov. 18, 2023

Altman's firing was over a "breakdown in communication between Sam and the board," and not "malfeasance", COO Brad Lightcap says in an internal memo

Nov. 20, 2023

Microsoft CEO Satya Nadella says the Windows maker has hired Altman, Brockman and their colleagues to lead a new advanced AI research team

OpenAI appoints former Twitch boss Emmett Shear as interim CEO. Shear pledges probe into Altman's exit.

Nearly all OpenAI staff threaten to quit and join Altman at Microsoft, demanding board resign and Altman and Brockman are reinstated

Nov. 21, 2023

OpenAI says Altman will return as CEO with a new initial board. Brockman will also return

Nov. 29, 2023

Altman says Microsoft will take a non-voting, observer position on OpenAI's board

Dec. 13, 2023

Axel Springer partners with OpenAI in a first-of-its-kind deal to deliver summaries of the global news publisher's content

Dec. 27, 2023

The New York Times NYT.N sues OpenAI and Microsoft, accusing them of using the newspaper's articles without permission to train chatbots

Jan. 25, 2024

The FTC orders OpenAI, Microsoft, Alphabet GOOGL.O, Amazon AMZN.O and Anthropic to provide information on recent investments and partnerships as it scrutinizes tech deals

Feb. 16, 2024

OpenAI completes a deal that values it at $80 billion or more, according to media reports

March 1, 2024

Musk sues OpenAI and Altman, saying they abandoned the startup's original mission to develop AI for the benefit of humanity

March 8, 2024

Altman returns to the OpenAI board along with three new directors

May 14, 2024

OpenAI co-founder and chief scientist Ilya Sutskever leaves the company

June 10, 2024

OpenAI hires Sarah Friar, former CEO of social media firm Nextdoor KIND.N, as its first CFO

June 11, 2024

Musk moves to dismiss his lawsuit against OpenAI and Altman

July 10, 2024

Microsoft gives up its board observer seat at OpenAI

August 5, 2024

Musk revives lawsuit against Altman and OpenAI

September 25, 2024

OpenAI's three top technical leaders, including CTO Mira Murati, quit the company

October 2, 2024

OpenAI raises $6.6 billion, valuing the company at $157 billion

December 27,

2024

OpenAI says it plans to revamp its for-profit arm into a public benefit corporation $(PBC)$ to ease the restrictions imposed by its current non-profit parent

January 14,

2025

Private equity veteran Adebayo Ogunlesi, CEO of Global Infrastructure Partners (GIP), joins OpenAI's board

January 21, 2025

OpenAI plans joint venture with SoftBank and Oracle ORCL.N to build up to $500 billion of new AI data centers in the United States

Microsoft changes its exclusive deal terms with OpenAI to allow the company to build additional data center capacity, paving the way for the JV

January 22,

2025

OpenAI and SoftBank say they will each commit $19 billion to fund Stargate, a joint venture to develop data centers for AI in the U.S

January 30,

2025

SoftBank Group is in talks to lead a funding round of up to $40 billion in OpenAI at a valuation of $300 billion, including new funds, sources say

February 10,

2025

A consortium led by Musk offers to buy the nonprofit that controls OpenAI for $97.4 billion.

February 11, 2025

OpenAI's board has not received Musk's takeover bid, source says

February 13, 2025

Consortium led by Musk will withdraw its bid for OpenAI's non-profit arm if the startup drops plans to become a for-profit entity, Musk's lawyers say

February 14, 2025

OpenAI rejects Musk's bid for the ChatGPT maker, saying the startup is not for sale and that any future bid would be disingenuous

March 4, 2025

A U.S. judge denies Musk's request for a preliminary injunction to pause OpenAI's transition to a for-profit model but agrees to a fast-track trial in the fall of this year

March 5, 2025

Britain drops its probe into Microsoft's partnership with OpenAI

March 15, 2025

OpenAI and Musk agree to fast-track a trial over for-profit shift

March 28, 2025

OpenAI must transition to a for-profit company by the end of the year to secure the full $40 billion funding led by SoftBank, a source says

April 1, 2025

OpenAI officially announces raising up to $40 billion in a new funding round led by SoftBank Group at a $300 billion valuation

April 4, 2025

Musk's lawsuit against OpenAI will go to a jury trial in spring 2026, federal judge presiding over the case decides

April 9, 2025

OpenAI countersues Musk, citing a pattern of harassment by him

April 15, 2025

OpenAI names members to its newly formed nonprofit commission, which will guide the company's philanthropic efforts

April 16, 2025

OpenAI in discussions to buy AI-assisted coding tool Windsurf for about $3 billion - report

May 5, 2025

OpenAI says it would remain under the control of its nonprofit parent, while pushing ahead with plans to change the structure of its for-profit arm

May 8, 2025

Instacart head Fidji Simo steps down to join OpenAI as its chief of applications

May 19, 2025

OpenAI prevails in a lawsuit in Georgia that accused the ChatGPT maker of defaming a radio host by fabricating allegations and a fictional lawsuit against him

May 21, 2025

OpenAI buys Jony Ive's startup io Products in a $6.5 billion deal

May 28, 2025

OpenAI's CFO Sarah Friar says the startup's restructuring plans position it for a potential future IPO

June 9, 2025

OpenAI says its annualized revenue run rate surged to $10 billion as of June

June 10, 2025

OpenAI plans to add Alphabet's Google cloud service to meet its growing needs for computing capacity, three sources tell Reuters

June 16, 2025

OpenAI wins a $200 million contract to provide the U.S. Defense Department with artificial intelligence tools

July 17, 2025

OpenAI launches AI agent for its ChatGPT

July 22, 2025

OpenAI and Oracle expand their tie-up to develop another 4.5 gigawatts of data center capacity

July 23, 2025

OpenAI wins trademark lawsuit over 'Open Artificial Intelligence'

July 31, 2025

OpenAI plans to build its first Stargate data center project in Europe, partnering with developer Nscale Global Holdings and investment group Aker ASA

August 18, 2025

OpenAI releases ChatGPT Go, a new India-only subscription plan priced at 399 rupees per month

August 21, 2025

OpenAI announces to open first India office in New Delhi

September 2, 2025

OpenAI says it will acquire Statsig in an all-stock deal valuing the product testing startup at about $1.1 billion based on OpenAI's current valuation of $300 billion

September 11, 2025

Microsoft and OpenAI sign a non-binding deal for new relationship terms that would allow OpenAI to proceed to restructure itself into a for-profit company

September 16, 2025

OpenAI hires Mike Liberatore, former finance chief at Musk's xAI, to be the AI startup's business finance officer

September 22, 2025

Nvidia plans to invest up to $100 billion in OpenAI and supply it with data center chips

September 23, 2025

OpenAI, Oracle, SoftBank announce plans for five new AI data centers in the U.S.

September 29, 2025

OpenAI rolls out parental controls for ChatGPT on the web and mobile

September 29, 2025

OpenAI introduces a feature that would allow users to make purchases through ChatGPT, in partnership with Etsy and Shopify

September 30, 2025

OpenAI launches AI video tool Sora as standalone app

October 2, 2025

OpenAI reaches a valuation of $500 billion, following a deal in which current and former employees sold roughly $6.6 billion worth of shares, a source tells Reuters

October 7, 2025

AMD will supply AI chips to OpenAI in a multi-year deal that would bring in tens of billions of dollars in annual revenue and give the ChatGPT creator the option to buy up to roughly 10% of the chipmaker

October 13, 2025

OpenAI partners with Broadcom to produce its first in-house AI processors

October 21, 2025

OpenAI unveils ChatGPT Atlas , a long-anticipated AI-powered web browser built around its popular chatbot

October 28, 2025

OpenAI says it will offer ChatGPT Go free to users in India for one year starting November 4

October 28, 2025

Microsoft and OpenAI reach a deal to allow the ChatGPT maker to restructure itself into a public benefit corporation, valuing OpenAI at $500 billion