GPT-5.5 Released: Built for Coding and Research, With Instant Becoming ChatGPT's New Default
OpenAI released GPT-5.5 on April 23, 2026 for coding, research and data analysis; GPT-5.5 Instant became ChatGPT's default in May.
February Sets an All-Time Monthly Funding Record: AI Takes 90% of $189B
Crunchbase data: startups raised a record $189 billion in February 2026, with AI-related companies capturing $171 billion — 90% of the total.
GPT-5.1 Released: A Warmer ChatGPT With Eight Personality Presets
OpenAI released GPT-5.1 on November 12, 2025, adding adaptive reasoning, a warmer conversational style and eight personality presets.
OpenAI Completes Restructure: A PBC Valued at $500B, With Microsoft Holding 27%
On October 28, 2025, OpenAI completed its historic restructure into OpenAI Group PBC, clearing its fundraising constraints.
ChatGPT Atlas Launches: OpenAI Declares War on Chrome as the AI Browser Battle Begins
OpenAI released Atlas, a browser with ChatGPT built in, on October 21, 2025 — joining Perplexity's Comet in making the browser the new AI-entry battleground.
OpenAI DevDay 2025: AgentKit and the Apps SDK Turn ChatGPT Into a Platform
At DevDay on October 6, 2025, OpenAI shipped AgentKit and the Apps SDK, and opened Sora 2 and GPT-5 Pro via API — a full platform play.
Sora 2 Arrives: OpenAI Launches Its Own 'AI TikTok' With Viral Cameos
OpenAI released the Sora 2 model and a social app on September 30, 2025, letting users cameo themselves and friends in AI videos — topping the App Store at launch.
Nvidia Plans Up to $100B in OpenAI: 10 Gigawatts Bind the Two Giants Together
On September 22, 2025, Nvidia and OpenAI signed an LOI to deploy at least 10GW of Nvidia systems, with Nvidia investing up to $100 billion as each gigawatt lands.
$300 Billion Over Five Years: OpenAI and Oracle Sign One of History's Largest Cloud Deals
In September 2025 OpenAI signed a five-year, $300 billion compute contract with Oracle starting in 2027, sending Oracle shares soaring.
OpenAI Officially Releases GPT-5 with Built-in Thinking, Free for All Users
OpenAI released GPT-5 on August 7, 2025, calling it its 'smartest, fastest, most useful model yet,' with built-in thinking available to free users.
OpenAI Returns to Open Source After Six Years: gpt-oss Ships Under Apache 2.0
OpenAI released the gpt-oss-120b and 20b open-weight reasoning models on August 5, 2025 — its first open weights since GPT-2.
AI Wins Its First Math Olympiad Gold: Google and OpenAI Both Reach the Standard
In July 2025, Google DeepMind's Gemini Deep Think and OpenAI's experimental model both hit gold-medal level at the IMO — LLMs matching gold medalists for the first time.
Windsurf Changes Hands Three Times in 72 Hours: OpenAI Out, Google Pays $2.4B, Cognition Takes the Rest
In July 2025 Windsurf lived the wildest 72 hours in startup history: after the OpenAI deal collapsed, Google paid $2.4B for the founders and Cognition bought whatever was left.
OpenAI Releases o3 and o4-mini: Reasoning Models Gain Full Tool Access
OpenAI launches o3 and o4-mini, the first reasoning models to integrate web browsing, Python, and image analysis directly into their chain of thought.
NYT v. OpenAI Cleared to Proceed: The Copyright Case of the Century Heads to the Merits
On March 26, 2025, a federal judge rejected OpenAI's motion to dismiss, letting The New York Times's core copyright claims proceed — with Microsoft as co-defendant.
A Researcher for Everyone: How Deep Research Became 2025's Standard AI Feature
From Gemini (Dec 2024) to OpenAI (Feb 2025) to the whole industry, autonomous research agents went from novelty to table stakes within a year.
The Starting Gun of the Agent Era: OpenAI Fires Off Operator and Deep Research
In January-February 2025, OpenAI launched Operator, a browser-driving agent, and Deep Research, an autonomous research agent — agents became products.
The Stargate Project: OpenAI, SoftBank and Oracle Pledge Up to $500B for AI Infrastructure
On January 21, 2025, OpenAI, SoftBank and Oracle announced Stargate at the White House — up to $500 billion over four years for U.S. AI infrastructure.
OpenAI o1 Launches: 'Think Before Answering' Opens a New Reasoning-Model Paradigm
On September 12, 2024, OpenAI released o1 (codenamed Strawberry), the first model trained via RL to think at length before answering — redefining reasoning.