OpenAI Unveils ChatGPT‑Codex Fusion: A Super‑Agent for 1 Billion Users

At the recent "Intelligence at Work" online event, OpenAI’s product lead announced the integration of Codex into ChatGPT, effectively merging two AI services that together serve nearly one billion weekly active users.

Three core upgrades were revealed:

Agent plugins : customizable plugins that tailor Codex to specific roles and tools, covering data analysis, creative production, sales, product design, market investing and investment banking, with connections to 62 mainstream enterprise apps and 110 built‑in skills.

Annotations : an inline editing feature that lets users select a portion of output (code, document, spreadsheet, slide) and tell Codex exactly what to change, eliminating the need to redo entire prompts.

Sites : a one‑click way to turn any AI‑generated output into an interactive web app, complete with a shareable URL and continuous, context‑aware updates.

OpenAI illustrated these capabilities with concrete demos. For data analysis, the product lead asked Codex to investigate a sudden surge in subscription cancellations; within minutes the agent generated a SQL query, produced a full report, and turned it into a presentation deck. In creative production, the same agent built a mood board from a product sketch, refined lighting and style, generated advertising images, and exported them to Canva for reuse.

The announcement emphasized that these upgrades dramatically lower the barrier to AI‑augmented work: anyone can now invoke an AI "colleague" without writing code, deploying servers, or managing domains.

Performance data from the "Next Era of Knowledge Work" report showed Codex weekly active users jumping six‑fold to over 5 million since February, with knowledge‑worker adoption reaching 20 %—three times the growth rate of developers.

OpenAI also highlighted the efficiency of the underlying GPT‑5.5 model, noting that it delivers comparable output quality while consuming only about one‑third of the tokens used by previous models, effectively reducing the cost of AI‑driven workflows.

Strategically, OpenAI positioned the fusion as a response to Anthropic’s recent "Cowork" launch, which extended its Agent engine to knowledge workers. While Codex’s three upgrades mirror many of Cowork’s selling points, OpenAI’s advantage lies in embedding the agent directly into ChatGPT, making the capability the default experience rather than a separate desktop app.

Finally, the rollout includes a preview of Sites for Business and Enterprise customers and signals OpenAI’s broader ambition to dominate the "work layer" of AI adoption, aiming to shift the current market concentration—where 74 % of AI‑generated economic value is held by the top 20 % of companies—toward a more democratized landscape.