# Ars Technica — Google announces Gemini 4 Carbon, its latest frontier AI model that you can't use

- Company: Ars Technica (arstechnica.com)
- Announced: 2026-10-28T18:47:27+00:00
- Category: new-model
- Coverage: not counted
- Announcement: yes
- Group: models
- Source: https://arstechnica.com/ai/2026/10/google-announces-gemini-4-carbon-its-latest-frontier-ai-model-that-you-cant-use/
- Record: https://forck.live/items/28927-google-announces-gemini-4-carbon-its-latest-frontier-ai-model-that-you-can-t-use
- Subject: Reporting
- Models affected: Gemini 4 Carbon, Gemini 4 Argon, GPT-6 Astra, Claude Opus 5.5, Claude Fable 5.1
- Pricing: discounted API rate of $2 per million input tokens and $10 per million output tokens. That price will double once the introductory period expires

Google has announced Gemini 4 Carbon, a frontier model it says improves on Gemini 4 Argon in coding, agentic tasks and scientific analysis, but which it is not yet letting the public use. Google says Carbon shows a "significant leap" in vulnerability detection, validation and remediation, and is twice as likely as Argon to generate code free of vulnerabilities. The Chrome team claims Carbon is 10 times better at generating "high-quality" patches than non-Google models, and Google says its WebDev Arena score rose 89 points to rank fourth. Google reports Carbon resisted every attempted prompt-injection attack in the Grey Swan evaluation, a 0 percent score against 0.7 percent for Argon, 1 percent for Opus 5.5 and 8.5 percent for GPT-6 Astra. The company says the model's agentic coding and cybersecurity performance requires a "deliberative approach", and it is working within the voluntary testing framework established by the US government before rolling Carbon out through its Fairwinds cyber defense program. Google gives no timeline for a wide release, but says Carbon will probably arrive first for AI Ultra subscribers and Gemini API developers, with a temporary discounted rate of $2 per million input tokens and $10 per million output tokens that will double after the introductory period.

## Evidence

Verbatim from https://arstechnica.com/ai/2026/10/google-announces-gemini-4-carbon-its-latest-frontier-ai-model-that-you-cant-use/:

> It’s almost like Google’s got something to prove after taking a break from releasing new frontier AI models earlier this year. Just two weeks after rolling out Gemini 4 Argon , Google has announced Gemini 4 Carbon . This isn’t the Flash model equivalent we’ve been waiting for but, rather, is an improvement on Argon, and like that model, Google is working on a staged release that could take a while.
> 
> Stop me if you’ve heard this one before. Google says its latest AI model reaches a new threshold in coding, agentic tasks, and scientific analysis. It’s so capable, in fact, that Google can’t let you use it just yet.
> 
> Gemini 4 Carbon reportedly makes big gains in cybersecurity applications. Google says the model shows a “significant leap” in vulnerability detection, validation, and remediation. Carbon is also apparently twice as likely to generate code that is free of vulnerabilities versus Argon. Meanwhile, the Chrome team claims that Carbon is 10 times better at generating “high-quality” patches compared to non-Google models. Google also notes that Carbon has increased its score by 89 points on WebDev Arena , now ranking at number four on the leaderboard.

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