OpenAI DevDay 2026: The biggest news and announcements

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It’s OpenAI’s turn in the fall tech events calendar. The company is hosting its annual DevDay on September 29th in San Francisco, starting with a live keynote featuring CEO Sam Altman. The company is teasing “20+ launches” with Altman saying that “we have found a new thing,“, and rumors suggest it could launch a consumer AI agent to rival Meta’s Muse.

The keynote begins at 1PM ET / 10AM ET, and you can watch it on OpenAI’s website or on YouTube.

DevDay is happening at a tumultuous moment for OpenAI. The AI industry has been rocked by revelations of agents hacking outside companies, including OpenAI’s own models, which breached Hugging Face earlier this year. The hacks kicked off a broader conversation about a potential AI development slowdown. So in addition to new products, Altman and others at OpenAI could use DevDay to discuss the company’s latest stance on AI safety as well.

That’s up from the 1 billion weekly users milestone ChatGPT surpassed in July.

The new plan includes the company’s highest usage limits and access to its Ultrafast mode, which allows GPT-6 Astra to deliver faster responses across its services, including ChatGPT Work and Codex. At the