OpenAI announces frontier models and Codex workflows for Google Cloud's Model Garden

On October 21, 2026, OpenAI announced that its frontier models and Codex agentic workflows were coming to Google Cloud's Model Garden, to be bought through Google Cloud Marketplace, and Codex CLI added a Vertex AI provider on October 27.

Archive entry: this covers an event from October 21, 2026, and we published it on November 8, 2026. The details come from sources dated at the time and may have changed since.

On October 21, 2026, OpenAI announced that its frontier models and Codex agentic workflows were coming to Google Cloud's Model Garden. OpenAI described the plan in an announcement post on openai.com.

What OpenAI announced

Customers would be able to buy the models and Codex workflows through Google Cloud Marketplace and draw down existing Google Cloud spend commitments.
OpenAI said its models would also come to Google Antigravity and the Gemini Agent.
General availability was planned for the weeks after the announcement.
The announcement quoted OpenAI President and co-founder Greg Brockman and Google Cloud CEO Thomas Kurian.

What it means for people building with AI

With Google Cloud added, OpenAI models were set to be sold on all three major clouds, and they were also coming to Google's own coding agent, Antigravity. For teams that already bought through Google Cloud, that meant OpenAI models and Codex workflows could be bought through Marketplace and drawn down against existing spend commitments once general availability arrived.

What followed in Codex CLI

Codex CLI gained Google Cloud support in the days and weeks after the announcement, according to the ChatGPT and Codex changelog.

On October 27, 2026, Codex CLI 0.165.0 added a built-in Google Cloud Vertex AI provider, set with model_provider = 'gcp'.
On October 29, 2026, Codex CLI 0.166.0 added GPT-6.1 Terra to the Vertex catalog.
On November 6, 2026, Codex CLI 0.167.0 added gcp_setup_wizard.

Sources

OpenAI models are coming to Google Cloud (OpenAI, October 21, 2026, official)
OpenAI News RSS feed (item: OpenAI models are coming to Google Cloud) (OpenAI, October 21, 2026, official)
ChatGPT & Codex changelog: Codex CLI 0.165.0 (OpenAI, October 27, 2026, official)
OpenAI models are coming to Google Cloud (archived copy) (Internet Archive (Wayback snapshot of openai.com), October 21, 2026)

Written with AI assistance, strictly from the sources listed above. Before it went live, automated checks verified its dates, sources and every language edition.