Programming experience approaching Opus 5.5? Google Gemini 4 new version exposed

What happened: Google is internally testing a new Gemini 4 version codenamed Carbon, now integrated into its internal coding platform Jetski, per Business Insider. Google declined to comment. Key numbers: Google released Gemini 4 Argon on October 1; internal versions tested include Argon, Barium and Carbon. Why it matters: Some employees said Carbon's coding feel is close to Claude Opus 5.5, while others said more testing is needed. It is unclear whether Carbon ships as an Argon update or a separate Gemini 4 model. Coverage: 3 outlets in 24h

Google is internally testing a new Gemini 4 version codenamed Carbon, now integrated into its internal coding platform Jetski, per Business Insider. Google declined to comment.

Some employees said Carbon's coding feel is close to Claude Opus 5.5, while others said more testing is needed. It is unclear whether Carbon ships as an Argon update or a separate Gemini 4 model.