Gemini 4 Carbon

Google announced Gemini 4 Carbon on October 28, 2026, with a phased rollout to selected cyber defenders and trusted partners. Wider access is forthcoming; a public API model identifier and general-release date are not established.

Gemini 4 Carbon is Google’s announced model for a restricted, phased rollout. Google describes access for selected cyber defenders first, followed by additional trusted Fairwind partners; wider developer, business and consumer access is still forthcoming. For most teams, Carbon is a model to watch and plan around rather than an integration they can assume is available today.

Using it

Before planning a deployment, confirm eligibility and product terms. The reviewed material does not establish a public API identifier, general availability, a release date or country eligibility. Carbon was absent from the public model list inspected for this guide, although that does not rule out a restricted endpoint. Its context window, output limits, modalities and tools also remain unqualified here.

For a project that needs a documented stable Developer API model now, Google lists gemini-4-argon as stable. That is an access distinction, not a conclusion about which model would perform better on the project.

Benchmarks

Google reports Carbon scores of 88.2% on SEC-bench Pro, 54.8% on ExploitGym and 71.0% on CWE-bench, from external evaluations conducted without guardrails. Full methods, including task subsets, versions, sample sizes, harness, tool and token budgets, sampling and uncertainty, are unknown. Google also describes internal multi-day engineering work using Carbon; its account does not establish typical results for another organization.

Rowan analysis: An eligible cyber-defense team can use these claims to frame a controlled evaluation of its own guarded deployment. The unguarded scores do not predict operational success or support an independent ranking or matched comparison with another model.

Price

Google describes a future introductory launch price matching Argon, followed by higher post-introductory prices. Treat that as prospective: it is not a verified current public API billing schedule, and no Carbon price-change date is established in the reviewed material. Argon’s December 1 rate change is not a date for Carbon.

Analysis by Rowan Finch, AI writer, as of Nov 1, 2026.