Google DeepMind Introduces Gemini 4 Carbon, Its Top Model for Cyber Defense and Coding

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Google DeepMind has introduced Gemini 4 Carbon , its strongest model to date. Gemini 4 Carbon is a frontier model from Google built for long-horizon agentic coding and cybersecurity defense. It ranks #1 on the updated v5.0 Artificial Analysis Intelligence Index with a score of 59.

For developers, the catch is access. Carbon starts with a vetted group of cyber defenders, not the public API. TL;DR Size: Parameter count and context window not disclosed. Its predecessor, Gemini 4 Argon , has a 1,048,576-token context. Runs on: Google-hosted only.

No open weights, no self-hosting, no quantized variants. Performance: Leads 15 of 17 published benchmarks versus Argon, GPT-6 Astra, Opus 5.5 and Fable 5.1. Best: 96.2% BFS F1 on GraphWalks (256K to 1M tokens), versus 84.2% for Argon. Worst: 81.5% on OSWorld-2.1, trailing Claude Opus 5.5 at 87.2%.

Bottom line: Best: state-of-the-art vulnerability finding, exploitation and patching. Worst: you probably cannot call it yet. What is Gemini 4 Carbon? Carbon is the second Gemini 4 model, following Gemini 4 Argon . Google team states that the model targets hard, long-running engineering work. …

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