Gemini 4 Carbon Explained: What It Is and Who Can Use It
Google just announced Gemini 4 Carbon. The date was October 28, 2026. It is Google’s new AI model. It is also its best so far. But most of us can’t use it yet. Just a few cyber defenders have it now. So here is what it is. Read on to see what it does. You will learn when you might get it.
What Is Gemini 4 Carbon? Google’s New AI Model
Gemini 4 Carbon is a new tool from DeepMind. It tops the Gemini 4 line. Its sibling Argon came out two weeks ago. The firm says this is its best yet. So it is built for cyber defense and long tasks. But Google has shared no tech paper. It has not shared the size, either.
Quick facts:
- Date: Oct 28, 2026
- Made by: Google DeepMind
- Best at: cyber defense, code, and long tasks
- Access now: a few cyber defenders
- Launch price: $2 in, $10 out per 1M tokens
Gemini 4 Carbon Release Date
The news came on Oct 28, 2026. Then, defense teams got it that same week. But Carbon has no public release date yet. Google says the rest of us get it “as soon as possible.” So we wait.
Argon gives a clue. It came out for Fairwind partners on September 30. At first, just those partners had it. Then, on Oct 13, more people got in. That wave had the paid API and some app users. So it may take the same path. A wider launch may come in weeks. But that is a guess. The firm made no promise.
Gemini 4 Carbon Cybersecurity Features
The firm splits cybersecurity work into three jobs. First, find the flaw. Next, prove that hackers can use it. Then, fix it. Carbon aims at all three. The tests ran with no guardrails on.
Finding Flaws
It scored 88.2% on SEC-bench Pro. The test asks a tool to find real bugs. They sit in real code. The firm calls the score the best yet.
Testing If a Flaw Is Risky
Not all bugs are the same. So teams must know which ones hackers can use. It scored 54.8% on ExploitGym. The firm says that is a new best. But it is the lowest of the three scores. So this job looks the hardest.
Fixing the Root Cause
It scored 71.0% on CWE-bench. This test checks one thing. Can a tool turn a bug into a real fix?
Real-World Signs
- It did over 2x better than Argon at safe code in tests.
- The Chrome team saw patches over 10 times better than a rival’s big tool.
- Wiz saw it lead on web pen tests. Wiz is a cloud firm.
Built for Long-Running Work
It is made for long jobs. For example, its teams saw it run for days. It did not quit at dead ends. It hunted small bugs in huge code bases. It dug into low-level systems, too. Plus, code skills grew. It gained 89 Elo points on WebDev Arena. So it now ranks fourth, with 1768.
The firm says it acts better:
- Cheating on Terminal-Bench 4.0 fell to 0.0%. Cheat tries fell to 0.4%.
- It makes half as many claims it can’t back up.
- Big alerts for bad acts fell by almost 80%. That was in live code tests.
- It beat every attack in a prompt injection test.
Gemini 4 vs GPT and Other Rivals
In the Gemini 4 vs GPT race, it ranks first on the AA Index v5.0. Its score is 59. That is just ahead of Claude Opus 5.5 and GPT-6 Astra. But other tests tell a mixed tale. So the table shows more.
| Test | Result for Carbon | How it compares |
|---|---|---|
| Artificial Analysis Intelligence Index v5.0 | 59 (rank 1) | Just ahead of Claude Opus 5.5 and GPT-6 Astra |
| Google’s 17-row benchmark table | Top score in 15 rows | Beats Argon in all 17 rows |
| FrontierSWE 2 (software engineering) | Behind | GPT-6 Astra and Claude Opus 5.5 both score higher |
| Vending-Bench 2 (business simulation) | $16,484 balance | Ahead of GPT-6 Astra and Argon |
Take care with these scores. Most come from the firm itself. Plus, the public can’t test it yet. So we need outside tests soon.
Gemini 4 Carbon vs Gemini 3.5
Gemini 3.5 came out in May 2026. Flash led that group. It is built for speed and agent tasks. Plus, it is the default tool in the Gemini app. But Carbon has its own job.
- Level: Carbon is new and sits atop Gemini 4.
- Focus: It is for cyber defense and multi-day code work.
- Access: Flash is open to all. Carbon is gated.
We found no direct test of the two. So the gap is unknown.
Gemini 4 Carbon Access for Defenders
Early access runs through the Fairwind Program. DeepMind runs it. It gives top defenders first use of new tools. Think of governments, health groups, and phone firms. Members must follow strict rules:
- Pass background checks
- Use strong, phishing-resistant login
- Limit use to in-house cyber, incident, or pen test teams
- Track who uses the tool
- Never share or sell access
The firm also joins a US government test. It is not a must. It runs before launch. So why the slow rollout? The same skills that find bugs can help hackers. So defenders go first. The firm hopes this gives them a head start.
Can I Use Gemini 4 Carbon?
Not yet. Only picked defender groups have it. But the firm plans to open it to more users. Still, it has named no date.
The price is set, though. It costs $2 per 1M input tokens. Output costs $10 per 1M. Plus, cached input gets 95% off. But this is an intro price. Then it rises to $4 and $20. The firm has not said when.
Frequently Asked Questions
What is Gemini 4 Carbon?
It is the top AI tool from Google so far. It is built for cyber defense and long code jobs.
Who can use Gemini 4 Carbon?
Right now, just picked cyber defenders can. Next come more trusted partners through Fairwind. Then it opens to developers, firms, and users.
How is Gemini 4 Carbon different from Gemini 3.5?
Gemini 3.5 Flash is fast and open to all. But Carbon is new and more skilled. Plus, access is tight.
Is Gemini 4 Carbon free?
No. The firm has set paid prices. It named no free tier. For example, launch prices are $2 and $10 per 1M tokens.
Conclusion
In short, Gemini 4 Carbon shows how fast Google moves. It came two weeks after Argon. Plus, it claims top scores in cybersecurity and code. But most results come from the firm. Access is tight, too. So watch for a public date and outside tests. Until then, Carbon is a tool for vetted defenders.
