Google reportedly tests internal Gemini 4 checkpoint "Carbon" against Opus 5.5 in coding

Business Insider reports that Google is internally testing a new Gemini 4 checkpoint named Carbon.

According to the report, Carbon matches Anthropic's Opus 5.5 in coding. The only source for this is the Business Insider report as relayed by Andrew Curran on X, and the report gives no benchmark figures or test details.