Gemini 4 Argon switches on today.

Starting today, Oct. 27, Gemini 4 Argon is set to be on by default in the Gemini Enterprise web and mobile apps. Google's admin documentation, updated Oct. 26, lists the model's toggle as turned off in the global, US and EU locations and says it "defaults to on beginning October 27, 2026." The same date applies to Argon in Workflow Builder and workflow agents.

This is background, not overnight news. Google made Argon generally available in Gemini Enterprise on Oct. 13, switched off at first, according to its release notes. Google describes the model as built for long-horizon work that needs deep reasoning, such as code migrations and frontier research.

The practical reading: an administrator who has not chosen yet should open the settings today. Google's path is the Gemini Enterprise page in the Cloud console, then the app, Configurations and the Feature Management tab, where Model availability sets which models users can pick. The model selector has its own toggle. Not every model can be switched off: for some generally available models, such as Gemini 3.5 Flash, Google says the toggle can't be turned off.

Not tested: this is a note from Google's documentation, not a workflow this issue ran. Since Oct. 22, Gemini Enterprise administrators can set single-user quota limits on the Usage & Spending > Usage page, so one user can't consume an edition's whole shared quota pool. Google lists the Standard, Plus and Standard Emerging Market editions.

The practical reading: with a newer model switching on by default today, a per-person cap is one way to keep a few heavy users from drawing down a shared pool. Google's note doesn't suggest a level. Setting the multiplier is a person's call.

OpenAI's announcement calls GPT-6.1 Terra "a significant step up from GPT‑5.6 Terra," as quoted by Simon Willison. That compares Terra with its predecessor, not with OpenAI's other current models.

OpenAI's Ted Sanders gave a narrower picture in a Hacker News comment Willison quoted. He put Terra probably ahead of Astra and Sol on technical communication, similar on vision and computer use but much faster, and "a bit worse on most other things." For subscribers, he wrote, "it's not a bombshell release."

The practical reading: by the vendor's own account, Terra's case is price and speed on visual, computer-use and writing tasks, not a general upgrade. This issue did not test it.