Google has announced Gemini 4 Carbon, its latest AI model built to find software flaws, test whether attackers could exploit them, and produce fixes.

Unveiled on October 28, 2026, Carbon builds on Gemini 4 Argon and targets complex security and coding work that can take days. Access will begin with selected cyber defenders, not a public launch.

According to Google’s announcement, Carbon combines stronger cybersecurity skills with improved handling of long tasks. Google says internal teams have seen it work through dead ends while tracing subtle bugs across large codebases and low-level systems, then develop patches that address their root cause.

Google reports that Carbon scored 88.2% on SEC-bench Pro for vulnerability discovery, 54.8% on ExploitGym for exploitation, and 71.0% on CWE-bench for patching.

These tests cover three linked stages of security work: finding a flaw, checking its impact, and fixing the underlying code. Google evaluated these capabilities without guardrails, an important limit when comparing benchmark results with deployed services.

Google Launches Gemini 4 Carbon

Carbon also leads the Artificial Analysis Intelligence Index v5.0 with a score of 59. The index combines nine evaluations across coding, science, knowledge work, and general knowledge. Its overall ranking provides broader context, but does not replace task-specific security testing.

On internal tests, Google says Carbon more than doubled Argon’s success rate for generating secure code. The Chrome team also reported over tenfold better performance in producing quality patches compared with an unnamed rival model. Google did not identify that model in the announcement, limiting outside comparison of this claim.

Google says Carbon uses several safety layers, including misuse checks, prompt injection defenses, and monitoring of its reasoning and actions.

On Gray Swan’s Indirect Prompt Injection benchmark, Carbon recorded a 0.0% attack success rate, compared with Argon’s 0.7%. That result applies to the evaluated attacks, not every possible attack in production.

The risk remains relevant for security teams using AI agents. Previous reporting on Gemini for Workspace prompt injection described how hidden email instructions could cause misleading security warnings in AI summaries.

Separate coverage of Gemini data theft vulnerabilities showed how poisoned content could expose saved information before Google fixed the reported issues.

Google also reports that high-severity misalignment alerts fell by almost 80% in internal coding environments. Unsupported claims dropped by roughly half compared with Argon. At the same time, successful cheating on Terminal-Bench 4.0 fell to zero in the reported evaluation.

Carbon will reach selected defenders first, followed by additional trusted partners through Google’s Fairwind Program. Google is also participating in voluntary U.S. government testing before wider deployment.

Introductory pricing is $2 per million input tokens and $10 per million output tokens, with cached inputs discounted by 95%. Standard rates will later rise to $4 and $20, respectively. Google has not announced a firm date for general availability.

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