OpenAI DevDay 2026 keynote livestream (OpenAI on YouTube)
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| Source: Techmeme | Original article
OpenAI streamed its DevDay 2026 keynote on YouTube, where executives presented over 20 new launches and demonstrated fresh AI capabilities.
OpenAI kicked off its annual developer conference on September 29 with a live‑streamed keynote from San Francisco. CEO Sam Altman, alongside Romain Huet, Tejal Patwardhan and Holly Li, opened the show at 10 a.m. PT and walked viewers through more than 20 product launches, new model capabilities and live demos of the company’s latest breakthroughs.
The most headline‑grabbing reveal was the re‑introduction of GPT‑4.5, a model that OpenAI says has been brought back to developers after a “re‑evaluation of the computation required to serve it and the associated costs of operating large‑scale, non‑reasoning models.” The announcement follows the September 29 release of GPT‑6.1 Sol and the Codex feature set we covered earlier this week, positioning OpenAI’s portfolio as a blend of high‑end research models and more cost‑effective tools for everyday coding and productivity tasks.
Why it matters: the GPT‑4.5 rollout signals that OpenAI is balancing raw performance with accessibility, a move that could broaden adoption among startups and enterprise developers who found the newest flagship models prohibitively expensive. Coupled with the refreshed Codex environment and the promise of “agentic coding” at lower price points, the announcements reinforce OpenAI’s bid to retain its lead in the developer‑centric AI market, especially as rivals accelerate their own toolchains.
What to watch next: OpenAI will field a live interview with Altman on CNBC at 12:15 p.m. ET, where the CEO is expected to discuss safety and the strategic rationale behind the GPT‑4.5 return. CFO Sarah Friar’s later segment will likely touch on pricing and revenue expectations. Developers should keep an eye on the official documentation that will follow the livestream for details on API access, pricing tiers and migration paths from older models. The next few weeks will reveal whether the new suite translates into measurable uptake and how it reshapes the competitive landscape ahead of the holiday launch cycle.
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