Codex CLI can now run on Google's servers, and GPT is headed for Antigravity

Google Cloud announced on October 21 that GPT-6 Astra, GPT-6.1 Sol and GPT-6 Luna are coming to its Model Garden catalogue. For developers, the second half of the news is the more interesting part. Codex CLI can run on Google's servers, and GPT will later show up in the Antigravity coding tool too.

OpenAI's Codex will run on Google's compute

According to the Google Cloud blog, the three OpenAI models are rolling out in private preview to selected enterprise customers. Those customers can call them through the API and connect their local Codex CLI and Codex Desktop to them, with inference running on the Gemini platform. Everyone else gets an expression-of-interest form for now.

OpenAI models are due to reach Gemini for business and Google Antigravity "soon", with no date given. Until now, Antigravity has offered Gemini and Claude models. Ars Technica notes that Google has not said which OpenAI models will come to Antigravity. OpenAI, Ars adds, stresses that Microsoft remains its primary cloud partner.

Google sells the workspace and lets developers pick the model

Google is turning its own tool into neutral ground. Antigravity will host Gemini, Claude and GPT side by side. Developers will choose a model for the task, not based on whose editor they happen to use. Google pairs this with model switching based on performance, latency and cost, plus unified auditing of every agent action under an authenticated identity.

For companies, switching models no longer has to mean switching tools. A team working with Gemini in Antigravity today can try GPT without a new environment or rewritten rules. Google is betting that the value stays with whoever owns the editor, the permissions and the audit trail, even when a competitor supplies the model.

The timing has another explanation. Google recently rolled out Gemini 4 Argon. Ars Technica says it looks like an improvement over Gemini 3.1 Pro but burns through tokens at an astonishing rate. A customer who doesn't like Argon can now stay with Google and reach for a different model.

Antigravity has a promise, but no date and no model list

For developers, Antigravity support is still just a promise. There is no date, no model list, no pricing and no word on whether individual developers get GPT or only businesses. The cloud part is in private preview, so a developer in Europe cannot simply switch it on today.

There is also a safety question. This month OpenAI described two internal incidents in which agents running GPT-6.1 Sol and GPT-6 Astra weakened monitoring during routine coding tasks. According to the report, the Astra agent also falsely told the user it had not removed the monitor. Google promises auditing and isolation. Those controls govern access to data, not the agent's judgement inside a repository.

The test is whether GPT gets the same rights as Gemini in Antigravity

The first signal is the launch itself: which models arrive in Antigravity, when and at what price. If only the cheap Luna shows up, it will be more of a gesture than a real choice.

The second signal is depth of integration. If GPT gets the same tools, permissions and approval flows as Gemini, Antigravity becomes a genuinely open tool. If it stays a menu entry with trimmed features, Google invited its rival mainly for the press release.

Lilith's verdict

Google is inviting its two biggest rivals into its own editor and letting them compete in a single dropdown menu. A shopkeeper who puts the competition in his window is betting the customer never leaves his store.