Gemini 4 Argon Is Doing Rust Migrations at Google Before Anyone Outside Can Use It
Google's next frontier model is Gemini 4 Argon, and the company says it leads on coding, knowledge work and cybersecurity. You aren't allowed to use it yet, which leaves the internal work as the only material on offer.
Ars Technica reports that Argon agents have been migrating C/C++ codebases to Rust across Google — thousands of lines in the core re2 and libgav1 libraries and more than 800,000 lines in the Fuchsia OS Zircon kernel. That is a different sort of claim from a benchmark score: it describes volume and sustained work rather than a single test run, and it is still the company's own account of what its agents did.
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An unavailable frontier model is a press release with a benchmark attached. The verifiable part is that Google built something it wants credit for, and that it isn't letting anyone else near it yet.
Google did bring numbers: 77.9 percent on the DeepSWE v1.1 software-engineering benchmark, ahead of GPT-6 Astra, Fable 5.1 and Opus 5.5. Vendor-run scores still need outside replication, but at least they can be checked.