Gemini 4 Carbon Is Generally Available, Google Says

Google has made Gemini 4 Carbon generally available to paying developers, enterprises and, on a rolling basis, Google AI Ultra subscribers. In a 10 November 2026 Keyword post, Koray Kavukcuoglu, Google DeepMind’s SVP and Google’s chief AI architect, called Carbon the company’s strongest model, built for long-horizon agentic work, complex coding and scientific reasoning. A companion Developers blog post the same day says developers can start building with the paid tier of the API in Google AI Studio and Android Studio.

This is a wider release of a model that had already been shown to a narrower audience. Two weeks ago Google gave Carbon to a set of cybersecurity defenders through its Fairwind programme, a step TSN covered at the time. Today’s announcement is the general developer and consumer-facing rollout, with a time-limited introductory API price that should not be confused with a subscription.

Gemini 4 Carbon API pricing is not the same as an Ultra subscription

Carbon is available via the API in Google AI Studio and Gemini for business for all paying developers and enterprises, at what Google calls the same introductory price as Gemini 4 Argon: $2 per million input tokens and $10 per million output tokens. A footnote on the Keyword post says that after the introductory period expires on 30 November 2026, the price of $4 per million input tokens and $20 per million output tokens will apply, and that this applies to the Carbon model intended for public access only.

That schedule is token pricing on the paid API. It is separate from access for Google AI Ultra subscribers, which Google says is rolling out in Google Antigravity, the Gemini app and AI Mode in Search. The Developers post adds that Ultra subscribers can try Carbon in AI Studio and Antigravity. Rolling out is not the same as a completed switch for every Ultra account on day one.

Source: Google Keyword post and Developers blog, 10 November 2026.

Google is also previewing /swarm in Antigravity, which it describes as turning a single prompt into a coordinated team of agents that can be tracked in real time. That feature is a preview. It should not be read as part of the general availability of the model itself.

Google still presents Argon as the default for most work

Carbon is being added beside Argon, not described as a replacement for it. Google says Argon remains the ideal choice for the majority of software engineering and knowledge work, while Carbon is aimed at tasks that “test the limits of a model’s intelligence,” using more tokens than Argon to explore, reason and run extended verification loops. That is a company distinction about intended use, not an independent finding that Carbon is better at every job.

The same post lists a run of benchmarks as Google’s own claims. It says Carbon ranks first on CursorBench 4.0, Perplexity’s WANDR and Zapier’s AutomationBench, “at more than 2X lower cost per task compared to the next best external model.” It also reports a 92% pass rate on a 375-task agentic honesty benchmark, compared with 70% for Argon, and says Carbon’s safeguards lowered a per-attempt breach rate to 0.8%, down from 3.1% on Argon. Other safety figures in the post, including prompt-injection results and tests credited to Gray Swan and Trajectory Labs, are presented in the same way: as Google’s account of evaluations it is highlighting.

Those numbers should be read as the company’s claims, in the same spirit as Google’s earlier global release of Gemini 4 Argon, which also mixed access rules with performance figures the company itself was putting forward. When Google published an Argon safety report, it said it could not rule out the model reaching critical cyber and bio risk levels. The Carbon post points readers to a full Gemini 4 Carbon safety and security report for more detail, and notes that prompt-injection robustness remains an area for continued improvement.

Other Gemini product changes continue around the model family. Gemini’s recent ability to edit documents, PDFs and slides inside the chat is a separate surface from Carbon’s API debut, but it is part of the same wider rollout of Gemini tools that paying users now have to map onto specific products and plans.

What Gemini 4 Carbon general availability does not settle

The useful facts in this announcement are the access list and the price calendar. Paying developers and enterprises can call Carbon through the paid API from 10 November, at a temporary $2 / $10 rate that Google says will not last beyond 30 November. Ultra subscribers are being offered the model in named products as those rollouts proceed. /swarm is still a preview. Argon has not been withdrawn.

What the announcement does not settle is how well Carbon will perform for any particular buyer once the introductory rate ends, or whether a first-place ranking on a Google-cited bench will show up in a given workflow. Cost-per-task comparisons depend on the benchmark and on the “next best external model” Google is measuring against, which the post does not name in that sentence. Safety percentages are likewise Google’s, from tests it chose to report.

For anyone deciding between Argon and Carbon, Google’s own framing is the one that can be stated with confidence: Argon is still presented as the everyday model, and Carbon as the more expensive, more token-hungry option for harder jobs. After 30 November, that difference will also be visible in the public API list price. The next date to watch is that expiry, not a further launch event Google has set here.

Scientists already in, or applying to, Google’s earlier Antigravity access programme are being offered Carbon as well, subject to eligibility, capacity and selection. Cybersecurity defenders can still apply to Fairwind. Those remain application routes, not the paid API’s general availability.

Sources

1. Koray Kavukcuoglu, “Gemini 4 Carbon is now available”, Google Keyword, 10 November 2026. https://blog.google/innovation-and-ai/models-and-research/gemini-models/gemini-4-carbon-now-available/
2. Google, “Gemini 4 Carbon is now available for developers.”, Google for Developers blog, 10 November 2026. https://blog.google/innovation-and-ai/technology/developers-tools/gemini-4-carbon-developers/

Related stories

Google’s earlier decision to give Gemini 4 Carbon to cyber defenders before developers is the direct predecessor to this general-availability release.

Also relevant:

• Google Releases Gemini 4 Argon Worldwide: What It Costs, Who Gets It and What Google Claims
• Google Says It Cannot Rule Out Gemini 4 Argon Reaching Critical Cyber and Bio Risk Levels