Models · Updated 10 Oct, 02:29 pm IST
Report: Google testing Gemini 4 'Carbon' variant that matches Anthropic Opus 5.5 on coding

Why it matters for readers: It shows how companies iterate on internal model variants and compare them to rivals.
- Business Insider saw documents, screenshots, and internal chats describing Gemini 4 variants named Argon, Barium, and Carbon.1
- Carbon was deployed on Google's internal Jetski coding platform and reportedly beats Argon on programming tasks.1
- An employee compared Carbon to Anthropic's strongest coding model, Opus 5.5, while early Argon versions were likened to the older Opus 5 on some coding tasks.1
- Google maps Argon as its frontier reasoning model, with Flash for speed, Omni for generative media, and Gemma for lightweight edge workloads.1
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