Alphabet and Google CEO Sundar Pichai Bloomberg/Getty Images As Google prepares to roll out its new Gemini 4 'Argon' model to the public, staff inside the company are testing better versions that may further close the gap with rivals.Most recently, employees have been trying a new version of Gemini 4 internally named Carbon, according to documents and screenshots seen by Business Insider.The model — possibly a new update to Argon, also known as a "checkpoint" — was made available inside Google's...