OpenAI Launches GPT-4 Turbo at DevDay

Summary

OpenAI held its first developer conference, DevDay, unveiling GPT-4 Turbo with a 128K context window at significantly reduced API pricing, along with custom GPTs and the Assistants API. The event showcased OpenAI's rapid expansion from research lab to platform company.

What Happened

On November 6, 2023, OpenAI held its inaugural developer conference, DevDay, in San Francisco. CEO Sam Altman delivered a keynote announcing a series of product launches that represented OpenAI's most aggressive push into developer tools and platform services.

The centerpiece was GPT-4 Turbo, an updated version of GPT-4 with several significant improvements: a 128K token context window (equivalent to roughly 300 pages of text), updated knowledge through April 2023, improved instruction following, and dramatically lower pricing — 3x cheaper for input tokens and 2x cheaper for output tokens compared to the original GPT-4 API.

Additional announcements included: custom GPTs (allowing users to create specialized AI assistants without coding), the GPT Store (a marketplace for sharing custom GPTs), the Assistants API (enabling developers to build agent-like applications with persistent memory and tool use), and JSON mode for structured outputs.

OpenAI also revealed that ChatGPT had reached 100 million weekly active users, underlining the unprecedented speed of consumer AI adoption.

Why It Matters

DevDay marked OpenAI's formal transition from an AI research organization that happened to have products to a platform company that happened to do research. The custom GPTs, Assistants API, and GPT Store were not incremental model improvements — they were ecosystem plays designed to make OpenAI the default infrastructure for AI applications.

The aggressive price cuts were strategically significant. By making GPT-4-class capabilities dramatically cheaper, OpenAI was simultaneously expanding its addressable market and making it harder for competitors to compete on price — a classic platform strategy.

The timing was striking: DevDay occurred just 11 days before the board crisis that would temporarily remove Altman from the company. In retrospect, the event's triumphant tone — celebrating commercial scale, developer adoption, and platform ambitions — highlighted the exact trajectory that some board members were reportedly uncomfortable with.