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GPT-4o Final Retirement April 3: Enterprise Custom GPTs Face Migration
OpenAI's April 3 deadline marks the complete retirement of GPT-4o across all plans. Enterprise Custom GPTs auto-migrate to GPT-5.3/5.4 with three known behavioral failure modes.
OpenAI Shuts Down Sora: $15M Daily Costs and Collapsed Disney Deal
OpenAI officially discontinues its Sora video generation app after six months, citing unsustainable compute costs of $15M per day and just $2.1M in lifetime revenue.
OpenAI Foundation Pledges $1 Billion in Grants for AI Safety, Alzheimer's Research, and Public Health
Sam Altman announces $1B in grants over the next year targeting disease cures, AI resilience, and economic disruption from automation, with new leadership appointments.
OpenAI Plans to Double Workforce to 8,000 by Year-End as Anthropic Gains Enterprise Ground
OpenAI outlines plans to nearly double its headcount from 4,500 to 8,000 employees by end of 2026, hiring 12 people per day to counter Anthropic's enterprise momentum.
OpenAI Acquires Python Toolmaker Astral to Supercharge Codex: uv, Ruff, and ty Join the Fold
OpenAI announces acquisition of Astral, maker of popular Python tools uv, Ruff, and ty, to expand Codex which now has 2 million weekly active users.
GPT-5.4 Mini and Nano: OpenAI's Cost-Efficient Models Built for the Subagent Era
OpenAI launches GPT-5.4 mini and nano on March 17, delivering flagship-tier coding performance at a fraction of the cost with 400K context windows.
OpenAI Acquires Promptfoo to Fortify AI Agent Security Across the Enterprise
OpenAI announces acquisition of Promptfoo, the open-source AI security platform used by 25% of the Fortune 500, to embed red-teaming and vulnerability testing into its Frontier agent platform.
ChatGPT for Excel Launches in Beta: AI-Powered Spreadsheet Workflows Arrive
OpenAI releases ChatGPT for Excel as a beta add-in powered by GPT-5.4, enabling natural language financial modeling, formula debugging, and scenario analysis directly inside workbooks.
OpenAI Robotics Lead Resigns Over Pentagon Deal, Citing Surveillance and Autonomy Concerns
Caitlin Kalinowski, OpenAI's head of robotics, resigns over the company's Pentagon classified network deal, warning that surveillance and lethal autonomy safeguards were rushed.
OpenAI Launches GPT-5.4: Computer Use, 1M Token Context, and Tool Search
OpenAI releases GPT-5.4 with native computer control, a 1-million-token context window, and a new Tool Search system that cuts token usage by 47%.
GPT-5.3 Instant: OpenAI Cuts Hallucinations by 26.8% and Drops the 'Cringe'
OpenAI released GPT-5.3 Instant on March 3, 2026, reducing hallucination rates by up to 26.8% while eliminating the overly cautious, preachy tone that frustrated ChatGPT users.
GPT-5.4 Accidentally Leaked in OpenAI Codex Repository: What the Code Reveals
Developers spotted GPT-5.4 references twice in OpenAI's public Codex repo pull requests, revealing a 2-million-token context window and full-resolution image handling before the code was scrubbed.
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